DECISIONS (1991-2005)
Contents
1. A a a This decision is shown against an incorrect sub clause number The sub clause number needs correcting to 2 5 and the decision moved to the appropriate position in the decisions list Furthermore the reference to table 9 needs correcting to table 2C When checking the frequency and for the calculation of the maximum peak current the frequency measured when the circuit is loaded with a 2000 O resistor is considered to be the value to be used As already covered in the above decision on 2 4 2 from 1994 the maximum peak current and the frequency measured when the circuit is loaded with the 2000 O resistor has to be considered If there is still a second frequency envelope waveform the most unfavourable value has to be taken into account In the case mentioned 330 Hz is the decisive frequency The chairman of WG5 of TC74 advised to use the measuring network of Annex D Figure D 1 which takes all frequency problems into account He is preparing a paper on the problems of different frequencies in touch currents will circulate that paper as soon as it is available Higher voltages are not allowed Tables 2B and 2C to be followed Behind a limited power source higher voltages can be created within secondary circuits out of the low voltage output of the limited power source HB material is possible even if there is for example a 1000 V back light source However an assessment has to be made to ensure that ther2. mounted suspended on a vertical surface by notches provided in the bottom of the enclosure for example routers base stations for cordless telephones Notches Movable equipment is considered to include wall The decision mounted equipment whose mounting method permits removal without a tool by an operator Consequently the equipment referred to is considered to be movable this allows the use of V 1 material I Document Item ci ieee Fee EN 60950 3rd edition Applicability EE Sec 1 04 13 4 A professional image server for control room The situation Amendment application uses a redundant power supply with to above two mains inputs each input connected to a document different power mains The redundant supply is 9 August provided to keep the server operational in very 2004 critical applications when one mains supply would fail The unit is provided with two detachable power supply cords with IEC 60320 appliance couplers is rack mounted and considered pluggable Type A equipment Problem this unit cannot comply with the touch current requirements in IEC 60950 3rd edition or 60950 1 because the touch current exceeds the strict limit of 3 5 mA for pluggable Class A equipment Table 5A at 264 V 60 Hz However in the m ost recent CDV of IEC 60950 1 2nd Ed there are a lot of changes in the requirements for touch current for equipment using redundant power supplies and for equipment located in re
3. a door or cover What should be the criteria for when access to The sucha small spinning fan is considered involve a question hazardous moving part that requires a guard Speed sharpness of blades etc causing possible injury to e g fingers 20 101 of EN 60335 2 80 specifies the following The 02 20 Fan blades other than those of fans for mounting decision athigh level shall be guarded unless their leading edges and tips are rounded and they have a hardness less than D 60 Shore or they havea peripheral speed less than 15 m s when the fan is supplied at rated voltage or the fan has a power output not exceeding 2 W when supplied at rated voltage NOTE An edge with a radius of not less than 0 5mm is considered rounded Compliance is checked by inspection and by measurement The original not a copy of CCITT test form No 3 The EA F1 3 91 5 2 shall be used at the heating test in normal use of decision telefaxes An alternative means is the Test Form Nr 4 named Addition to EE Chm 5 98 Black White facsimile test chart BW01 ITU T test decision chart No 4 A thin plastic coating spraying on the external The 91 9 EA F1 3 91 4 3 2 surface ofthe metal enclosure is not taken into decision account when determining the temperature rise on touchable metal parts Document Comments Bell oie 2 Item For the heating test requirements of optocouplers EA GB 3 93 6 24 reference should be made to manufacturer s data He
4. is decision separately certified Varistors across the mains with a protective device to guard against short circuit Accepted by all countries whether the varistor is separately certified or not Varistors between the mains and the protective earth 1 For Pluggable equipment type A Accepted by all countries when the varistor is separately certified except Austria Belgium Denmark Finland Germany Norway Sweden United Germany EE Chm 3 03 Kingdom added to 2 For pluggable equipment Type B and decision in permanently connected equipment connected to 2003 protective earth Accepted by all countries when the varistor is separately certified inati The EE Chm 5 98 decision the varistor EE Chm 3 03 certified added to decision A combination of a varistor the varistor need not Amended EE Sec 2 04 be separately certified in series with a spark The first gap gas tube complying with basic insulation i e paragraph electric strength test and external creepage of decision distances apply to the spark gap gas tube deleted and between the mains and protective earth and witha replaced protective device to guard against short circuit 1 Pluggable equipment Type A Accepted by all countries 2 Pluggable equipment Type B and permanently connected equipment accepted by all countries NB Where the term separately certified is applied to a varistor in the above this means that the varistor is separ
5. natural movement of the components shall be taken into account A heat shrinkable tubing is an acceptable means The 95 4 EE Chm 5 95 5 1 11 of additional security to single clamping or decision soldering of internal wiring but not for the termination of the mains cord The E he E he E 4 8 Chm If there is a possibility of mis mating of modular 98 6 EE Chm 5 98 9 14 connectors e g R411 R412 etc accessible for decision the user tests have to be made to verify that the SELV limits remain If the voltage of the TNV circuit is known this value is used otherwise the test generator of 2 3 5 Figure 2E is used for testing Every NTR concerning an equipment with plugs as T 96 10 EE Chm 5 96 8 1 part of the enclosure shall have additional decision information about the tests made on the plug The circulated 2 pages give an example for Class II plugs Class plugs shall be handled accordingly Chm Fl Fl The requirements for lithium cells apply to The 93 10 EA GB 3 93 separate devices such as memory cards remote decision control units etc GB 6 18 4 3 8 When calculating the reverse current the voltage T 95 13 EE Chm 5 95 9 8 of the battery is considered to be zero decision If one type of display tube has been tested for The EA GB 3 93 6 16 ionising radiation similar types can be accepted decision without test The ionisation test shall be carried out under normal operating conditions A decision was made in 1
6. of The HB material has to have a marking stating the proposal following as the battery is to comply with the requirements for LPS For use only with battery MANUFACTURER MODEL This statement shall also be in the user instructions Alternative marking The Use only batteries listed in the user instructions decision or For batteries see user instructions This statement shall also be in the user instructions The user instructions must then have a listing of manufacturer and model of the relevant batteries Subject protective bonding conductor test current and duration for d c powered equipment rated in excess of 16 A Subclauses 2 6 3 3 2 6 3 3 2 6 3 4 The referenced standards indicate that the protective bonding conductor test current and its duration for d c powered equipment are specified by the manufacturer when the current rating exceeds 16 A Which are the minimum current and time values we should accept for such test The current rating of the circuit means the current rating of the protective device see meeting of WG8 of IEC TC74 in Helsinki When the manufacturer specifies a test current and duration that current and duration shall first be used to check that the protective device will operate in this condition If the protective device does operate the test current and duration specified by the manufacturer shall be used to test the protective bonding conductor If the protective device does not
7. operate the testing laboratory shall ask the manufacturerto specify a more suitable combination of test current and duration Internal connections for earth continuity achieved by one rivet in combination with a lock washer are acceptable The maximum rated current in different CENELEC countries for fuse links inside Pluggable Equipment Type A are as follows Denmark 16 A Finland 16 A Norway 16 A Sweden 16 A Switzerland 16 A United Kingdom 16 A Two protective devices may be required in equipment intended to be connected to an IT power system In Norway IT power system is used However only one protective device can be accepted there One fuse is acceptable based on the judgement that the installation fuse could protect the appliance in every earth fault case Partial discharge test VDE 0884 for example for optocouplers is not accepted for the time being Parenthetical note added Comments The 94 16 EE Chm 1 94 decision The 91 1 EA FI 3 91 3 4 decision The 94 16 EE Chm 1 94 decision Th Document EE Chm 3 02 Item The 10 8 situation Referring to 60950 1999 and 60950 1 2000 The question The decision 02 14 The decision 4 7 1 Additional information EA Fl 1 91 3 e EA F1 3 91 decision Addition to decision EE Sec 1 04 ae ica Ea a The insulation of an accessible LED which is The 94 18a EE Chm 1 94 connected to hazardous voltage shall fulfil th
8. 2 91 17 94 13 00 8 The 95 11 decision a Item 3 02 10 4 EE Chm 5 96 6 6 EA FI 3 91 411 EE Chm 1 94 6 12 EE Chm 1 94 10 3 E Chm 5 00 10 5 E Chm 5 95 9 7 This statement shall also be in the user instructions It may be considered that the Decision 99 2 requiring marking of manufacturer and model of the power supply on the product is too stringent in light of sub clause 1 7 2 A possible solution has been discussed with some OSM delegates about accepting a text on the product having the following information For applicable power supplies see user manual or Use only power supplies listed in the user manual The user manual must then have a listing of manufacturer and model of the relevant power supplies Decision 99 2 is amended to read as follows A Class III equipment with an enclosure made of HB material and using a non special connector for the a c d c input has to have a marking stating the following Use only power supplies listed in the user instructions or For applicable power supplies see user instructions This statement shall also be in the user instructions The user instructions must then have a listing of manufacturers and models of the relevant power supplies In respect of reducing the risk of ignition and spread of flame Method 2 of 4 7 1 of EN 60950 2000 is recommended The wording special fusing characteristics includes breaking capacit
9. 25 mass exceeding 18 kg Compliance clause in decision 4 6 2 covers this problem It is acceptable to have a printed circuit board The 93 11 EA GB 3 93 6 21 above a fire enclosure having holes greater than decision 40 mm with holes of less than 40 mm if the components close to the holes comply with flammability class V 1 Compliance is checked by examination of the construction and of the available data If such data are not available compliance is checked by the following tests 1 What documentation is required For example description of the materials from which the adhesive is composed test results of acyclic test over 600 h at 30 C to 70 C Is this sufficient for parts not subject to heat ls a UL 746C Polymeric Materials use in electrical evaluation approved adhesive acceptable 3 Is proof of resistance to heat at 90 C UL RTI 90 QMFZ2 sufficient Other We do not have sufficient experience to be sure that any of the suggested conditions or tests in item 1 2 or 3 above are equal to or better than the requirements in 4 6 5 or 4 3 22 Available data have to prove compliance with the requirements of 4 3 22 or 4 6 5 If not the relevant tests have to be applied Declaration of used materials with adequa te information from the equipment manufacturer is acceptable The flame resistance of plastics materials listed by national certification bodies such as in the Yellow Book by UL can be taken into acco
10. 50 1 and therefore see the described question signal as a starting pulse and its r m s value not taken into account when determining the minimum creepage distance If so what about the pulse duration Is for example a pulse duration of 5s acceptable or 10s At the moment it is advised to use the table of The IEC EN 60926 decision We have to take into account repeatable high voltage if the lamp does not conduct during start or in fault conditions The ongoing work in TC74 WG6 now TC108 Comment 74TT WG6 will be monitored The latest paper will be distributed for information Thel atest paper is proposals for EN 60950 1 2nd edition relating to Sub clauses 2 10 1 7 2 10 2 1 2 10 3 5 and 2 2 3 Latest papers are now 108_100e_CDV and Additional 108 _123e RVC Subject to amendments comment 108_100e_CDV has now been approved as FDIS by OSM In the RVC there were no technical comments on Secretary 2 10 1 7 2 10 2 1 2 10 3 5 or 2 2 3 December See 108 _100e_CDV or the subsequent FDIS in pub respect of this question and refer to Sub clauses 2 10 1 7 2 10 2 1 and 2 10 3 5 Ns ID nce le 2 10 3 2 Table 2J stops at 1300 V repetitive voltage For The 98 3 EE Chm 5 98 higher voltages extrapolation of the table is decision possible Table 2L stops at 1 kV working voltage for The EE Chm 5 98 Pollution Degrees 2 and 3 situation For higher voltages Table 4 of HD 625 1 S1 The IEC 60664 1 has to be used d
11. 995 and applied to both 95 38 EE Chm 5 95 10 12 EN 60950 and EN 60650 but see below For apparatus comprising a laser product the Modified 96 4 EE Chm 5 96 6 22 class the laser data and the relevant warning decision marking shall be stated in the test report Comments Document Ret item Which version of Laser standard EN 60825 1 The EE Sec 1 04 5 1 2 to use as referenced by EN 60065 6th Ed CI 6 2 question and EN 60950 1 CI 4 3 13 5 Adopt the CTL Decisions DSH 538 and DSH 539 The 04 1 As an alternative to the Normative references in Decisions the standards mentioned above IEC 60825 1 A2 538 60065 2001 can be used in combination with this and standard when agreed to by the manufacturer 539 60950 Identical In connection with this agenda item it was noted Comment that the date of withdrawal dow applicable to A2 of EN 60825 1 has been revised and is now 1 July 2005 The CENELEC secretariat will issue a corrigendum for the dow change If it is clearly evident that there are no hazardous The 93 16 EA GB 3 93 6 32 moving parts then marking detailed in this clause decision is not required 3 02 10 10 Protection in Operator Access area The EE Chm Small spinning fans typically 5 8 cm size in user situation accessible area may be evaluated differently due to 4 4 2 consideration of hazardous moving parts The access to the fan may be directly from the outside or when opening
12. A FI 1 91 EE Sec 1 04 EA F1 3 91 6 1 amp 6 2 continued below Document Item EE Chm 3 03 5 1 8 Comments ea The figure shows a circuit that is connected to a The situation telecommunication network Based on the network a TNV1 situation applies Tiisa separation transformer which withstands 1500 V a c electric strength ES test This transformer is due to a functional concept bridged by a resistor of 38 kO to earth and by another resistor of 38 kO to a 48 V d c circuit which only has functional insulation to SELV e g an RS 232 communication port The equipment is pluggable type A but will only be installed by a service person and the installation instructions require it to be connected to an earthed socket outlet So for the protection of telecom network users from hazards in the equipment the exclusions of 6 1 2 2 apply This means that the resistor of 38 kO to earth is allowed for this application and can be accepted without ES test For the resistor to the 48 V d c circuitry cl 6 2 applies protection ofequipment users from overvoltages on telecom networks In this case there is only functional insulation to SELV and the circuit does not withstand the ES test between the connection for telecom network and RS 232 connector SELV Cl 6 2 1 says the following equipment shall provide adequate electrical separation between a TNV 1 CIRCUIT or a TNV 3 CIRCUIT and the following
13. DECISIONS 1991 2005 EN60950 3 Edition and EN 60950 1 1 Edition CENELEC Operational Staff Meeting for Electronic Equipment OSM EE DECISIONS 1991 2004 OSM EE Sec 3 2004 Standards EN 60 950 3rd Edition and EN 60950 1 This List of Decisions is the outcome of the CENELEC Operational Staff Meeting for Electronic Equipment OSM EE The decisions are designed to assist with common application of the standard and not to change the meaning of the standard which remains the definitive document This list contains also items related to EN 60950 1 where specified under comments Whether or not other decisions can also be used for EN 60950 1 has to be verified It was not until the 1995 meeting that numbers were assigned to decisions in the form of a two digit year identifier one or two digit sequence number Following the 2004 meeting and consultation between the secretary for that year and some members of the OSM it was decided retrospectively to assign numbers to the earlier decisions The numbers for the decisions made at the meetings from 1991 to 1994 inclusive are shown in bold type in this 05 2004 decisions list In the 2005 list these are to be demoted from bold Clause Decision Comments Testing of an LCD TV with external power supply Description 99 15 EE Chm 3 02 unit of situation The set needs to be certified according to IEC 60065 ed 6 The external power supply is already certified according to IEC 60950 by anoth
14. Sec 25 2 10 54 could also be used for insulation The 96 16 EE Chm 5 96 i imi imi decision they comply with the tests of Annex UL Decision 96 16 deleted EE Sec 1 04 The requirements for distances through insulation The 95 2 EE Chm 5 95 are to be applied to lateral separation between decision layers provided that the thermal cycling test is passed W Requirements for a tape for insulation The 03 7 EE Chm 3 03 Based on cl 1 3 4 when an adhesive is required to decision maintain a level of safety e g adhesive tape then it is recommended to apply the cl 4 6 5 In light of the response from Mr Ferguson IEC TC 108 MT 2 Interpretation Panel referred to at the end of Annex J to the minutes of the OSM EE April 2004 the OSMEE might wish to review Decision No 03 7 again y ena Comments Document ___ Ref Item In pluggable equipment the mains plug can be T 91 15 1 91 4 8 considered as a disconnect device Disconnect decision devices shall be either a double pole mains switch IT power system all pole mains switch or a mains plug Therefore in pluggable equipment a single pole mains switch or a micro switch can be accepted In pluggable equipment a semiconductor or a combination of semiconductors can perform functional switching for standby operation 7 he EA i and 4 9 Force of 10 N shall not be used for testing the he 91 14 EA F1 3 91 compliance of 4 3 4 Securing of wires is decision important The
15. ately certified according to Publications IEC 61051 1 and IEC 61051 2 or according to CECC 42200 Varistors VDRs may burn or burst during lifetime due to an increasing temperature stress caused by increase of leakage current with a number of switching cycles in the VDR This is suitable protected where a gas filled surge arrestor gas tube is in line with the VDR In circuits where no gas tube is required a thermal interrupting device on the VDR connected in series with the VDR is to be provided Compliance criteria s clause 5 3 8 1 Clause 1 5 1 The following table should be used as guidance when assessing the use of CSA and or UL type fuses in equipment Fuse rating A Max S C Current A 1 or less 35 1 to 3 5 100 3 5 to 10 200 10 to 15 750 15 to 30 1500 We may accept resistors on the primary side to be used as protective device provided that they complywith all the following conditions It shall operate satisfactory when the appliance is tested according to EN 60950 Compliance is checked by repeating at least 10 times each case with a new resistor during worstcase fault condition test when the appliance is directly connected to the mains The resistor may not interrupt with explosion or spark flame which are not in compliance with the standard Not accepted in operator access area The resistor is to be listed as critical component in the testreport Identification using part number or the l
16. cision dielectric strength test 2 10 1 Force of 10 N shall be applied to all internal parts The 91 7 EA F1 3 91 whether they are accessible or not See 4 2 2 decision E 2 10 2 In a transformer the highest occurring working The 94 14 EE Chm 1 94 voltage is the basis for insulation requirements decision Outside the transformer the voltage actually measured is used If two or more secondary windings are connected together even outside the transformer the voltage actually meas ured on each winding is the basis for insulation requirements provided that the relevant windings are insulated from each other inside the transformer If the secondary voltage is not accessible only functional insulation is necessary EE Chm 5 95 Comments Document Ret tem There is an LC igniter for a high pressure lamp The EE Chm 3 02 12 4 The open circuit output voltage of the igniter is as situation indicated in the figure PM3384 FLUKE amp PHILIPS n San 1 7 00KV GN 2 100k B 80pms 4 7Sdvich1 One igniti on cycle takes approximately 4 s During the 4s period Upp is approximately 5 kV for a maximum of 1 s After 1 s the voltage decreases to approximately 500 Vpp and after the 4 s the cycle stops no output If a lamp is connected and ignites the cycle will stop immediately The normal lamp output voltage is approximately 160 V square wave Do delegates agree with the proposal for Amd 1 of The IEC 609
17. d according to IEC 60738 1 or to at least the Clauses 15 17 J15 and J17 of IEC 60730 need not be short circuited under fault conditions Insert or to at least the Clauses 15 17 J15 and J17 of IEC 60730 in the decision Components can be short circuited whether they are separately approved or not However if a component complies with requirements for reinforced insulation it shall not be short circuited Refer to simplified diagram below The secondary electronic circuitry is used to superimpose a data signal on the line voltage TX701 is a reinforced insulated signal transformer Its transformation ratio is 1 1 F1 is a fuse and L1 is acoil and C1 is a capacitor O22uF 250VAC X2 TRANSFORMER ISOLATED Should a short circuit of C1 be evaluated assumed if C1 is a certified X capacitor Yes taking into account the definition of the use of a Class X capacitor given in Sub clause 1 5 3 of EN 132 400 the X2 capacitor used as shown in the simplified diagram should be short circuited as a fault condition This is because a failure of the capacitor might cause a risk of electric shock from the secondary circuit Temperature rises higher than 300 C can be accepted if the manufacturer has proved that the material in question withstands the temperature Comments The decision Amendment to decision The decision The situation The question The decision The decision Document EE Chm 5 97 9 19 E
18. e decision requirements of Clause 2 10 but is not tested with the steel sphere Line space added here The foil of a membrane switch is allowed to be used as insulation against hazardous voltages if the mechanical construction provides sufficient strength and lifetime The insulation between the heat sink and the The EE Chm 1 94 current carrying parts of an electronic component decision oxide layer can only be considered as functional The EE Sec 1 04 insulation The insulation of the outside of a capacitor 95 8 EE Chm 5 95 according to IEC 60384 14 2 ed fulfils the decision requirements for basic insulation For reinforced insulation the distance requirements of EN 60065 and EN 60950 must be fulfilled 95 14 Insulation between parts directly connected to the The EE Chm 5 95 mains in front of a fuse has to fulfil the decision requirements for operational insulation or pass the test of 5 3 4 b For judging distances combination of creepage The 95 15 EE Chm 5 95 and clearance from the high voltage connection of decision a CRT table 2K or according to subclause 2 1 1 1 paragraph after Note 4 the dielectric strength test is to be used Reinforced insulation is required to the outer 95 16 surface of an enclosure when of insulating material and operational insulation is required to an internal earthed part 2 10 According to 3 1 4 the insulation of primary and The secondary lead outs need only to fulfil the de
19. e is no fire or ignition hazard Document Comments Item Th e 95 19 EE Chm 5 95 9 17 decision Proposal EE Sec 1 04 14 4 for correction and improvement The EE Chm 1 94 10 7 decision WG8 of IEC TC74 agrees The 00 9 EE Chm 5 00 10 9 decision A comment by OSM EE chairman of year 2000 The 98 5 EE Chm 5 98 9 14 decision See also 2 6 Limited Power Source Battery supplied The equipment Battery supplied equipment with an situation enclosure of HB material shall only be used with batteries that are in compliance with LPS Alternative batteries on the marketmay not comply with LPS limits and shall therefore notbe used with such equipment With reference to the decision 99 2 to 1 7 2 for use of alternative Power Supplies ref below it is proposed to consider a similar decision for alternative batteries for battery supplied equipment 02 13 Document EE Chm 3 02 The decision now shows as Decision EE Sec 1 04 14 4 Until the standard is changed condition 2 to table 95 19 2C should be read as follows corrected and sty renumbered 04 10 Overcurrent protective devices within the equipment shall be bypassed in turn It is acceptable to use a track on a PCB as the The 93 6 EA GB 3 93 6 10 safety earth path provided it meets the decision requirements of the relevant tests Comments Item 10 7 with an enclosure of HB material Battery supplied equipment with an enclosure
20. ecision Ina5 V circuit on the primary side of a switch The 93 7 EA GB 3 93 mode power supply having a direct connection to decision the mains 230 V a c the working voltage to be used for table 6 is 250 V a c If the working voltage is lower than 250 V itis seen as 250 V If it is higher distances have to be calculated Additional EE Chm 5 97 according to 2 10 and where a higher working decision voltage than the mains voltage 250 V is present higher requirements for creepage distances clearances and insulation high pot tests have to be taken into account The plastic enclosure of a semiconductor can be The 95 17 EE Chm 5 95 considered as basic insulation These components decision including alternatives must be listed in the list of critical components and there must be a remark in the service documentation Insulation between semiconductors mains and The 95 7 EE Chm 5 95 heat sinks Either a second sheet is required or it decision must be checked whether the distance through insulation has to be increased to comply with the requirements of clauses 4 and 5 2 10 5 2 is not to be used for winding wires Only The 96 15 EE Chm 5 96 2 10 5 4 applies decision The tests on non separable 3 layer foils are done The 00 1 EE Chm 5 00 on a separate sample using a test voltage of decision 4 5 kV 3 x 15 kV for reinforced insulation Decision made in the 37th meeting of TC74 WG6 Comment TC74 WG6 in Stuttgart
21. en poles of the mains supply rewritten after a fuse is not in compliance with EN 60065 and Sub clause 14 1 it must be short circuited or renumbere interrupted during fault condition tests in 5 4 2nd d Ed or 5 3 3rd Ed and EN 60950 1 2001 Resistors connected between the mains and protective earth must comply with the requirements of EN 60065 Sub clause 14 1 a Capacitors which are connected after a rectifier in The EA FI 1 91 a primary circuit of a switch mode power supply decision unit need not be separately approved In a primary circuit before a rectifier there is installation category III for Permanently Connected equipment therefore class X1 capacitors must be used In a primary circuit before a rectifier there is installation category II for Pluggable equipment Type A and Pluggable equipment Type B Changed therefore minimum class X2 capacitors must be acc used The use of a mains fuse a mains filter or a discussion varistor cannot be a method to reduce installation by mail category Secondary circuits are normally in installation See also EA FI 1 91 category when the primary is in installation 2 10 3 4 in category II However a floating secondary shall be the subject to the requirements for primary circuit in standard table Ill unless separated from primary circuits by an earthed metal screen a a al erg 2 Ret Varistors across the mains The EE Chm 1 94 Accepted by all countries when the varistor
22. ent of V 2 material decision The word partition added as shown above Amendmen EE Chm 1 94 6 14 t to decision 4 4 4 4 4 ST 4 7 3 2 Liquid crystal display LCD is tested as a The 91 23 EA FI 1 91 4 12 3 sandwich and it shall fulfil the requirement of a decision fire enclosure 4 7 3 2 Enclosures of a keyboard or similar devices e g The 95 24 EE Chm 5 95 9 27 mouse trackball can be accepted to be made of decision material class HB based on abnormal test 4 7 3 2 The 13 mm requirement of clause 4 7 3 2 is not The 93 12 EA GB 3 93 6 22 relevant to the requirements of clause 4 6 decision T 7 7 7 T 3 Thin metal foil may be used in the construction of a fire enclosure on HB material provided 1 The complete enclosure shall be tested to Appendix A1 or A2 and 2 The foil covers all areas where there is a source of ignition There is no mechanical strength requirement on the foil other than that for the enclosure The use of metalised coating sprayed on the inside of an enclosure made of HB material is also acceptable provided the tests according to Appendix A1 or A2 are met Materials of Fire Enclosure A supplier of LCD projectors typical weight from 1 to 5 kg and intended for ceiling mounting and or transportable use together with notebook computers offers a ceiling mount accessory kit The kit has two major parts one piece mounts to the ceiling with permanent fasteners the o
23. ent with a normal plug will be hazardous EA Fl 3 91 EE Chm 5 95 E Sec 1 04 EE Chm 5 97 E Sec 1 04 Where equipment tested to the current version of The 97 9 EE Chm 5 97 the standard incorporates a subassembly e g a Decision power supply unit certified to an earlier version of the standard which is still valid for production the equipment test report shall clearly identify the version against which the subassembly was initially assessed In determining any additional tests consideration shall be given to the application such as location and orientation Also applicable changes in the standard shall be taken into consideration 1 2 4 3 If the safety strategy of an equipment containing ka a Chm 5 97 9 1 SELV and TNV circuits relies on protective os earthing this equipment is considered to be Class and not Class III RFI filters having components meeting 93 5 EA GB 3 93 IEC 60984 14 are oe oti he 91 10 EA FI 1 91 Pele 96 14 EE Chm 5 96 Additional 00 7 decision Rewrite the decision so that it shows as Proposal EE Sec 1 04 Resistors connected between poles of the mains Decisions supply before a fuse must comply with the 9140 requirements of either Sub clause 14 1 a or amp Sub clause 14 1 b of EN 60065 96 14 Resistors connected between poles of the mains with supply after a fuse need not comply with EN addition 60065 Sub clause 14 1 However if a resistor 00 7 connected betwe
24. equipment that are tested according to 95 6 Publication EN 60950 Sweden The kind of information supplied with the unit shall include a statement that the unit is intended for office machines equipment only Germany The above information has to be in the Users Manual ia Products similar to previously certified products The shall be covered by an Addendum to the base Decision report The CCA format shall be used where possible The CCA cover page should always be used Addendum reports should be derived from a base report not an already derived report Comment The Decision Delete the paragraph The primary testing The laboratory each Certification Body proposal These statements are not appropriate for inclusion The reason in the decisions list It was agreed to delete the paragraph The decision Plug with integrated Power Supply Description of situation The equipment has to have a complete marking as The for a power supply Decision If the marking is on a part of the enclosure that is Layout of gripped while pulling inserting the device from into decision a wall socket outlet additional requirements for amended the durability of the marking are necessary for clarity For the time being the meeting decided to use the by the marking requirements of EN 50144 1 Safety of addition of hancheld electric motor operated appliances line spaces Safety instructions shall state clearly that a replacem
25. er certification body The LCD TV may be used as a monitor as well The intention of the manufacturer is to put the LCD screen monitor and the power supply together on the market Case 1 LCD multimedia screen with a built in The PSU pre certified Decision The whole apparatus has to be tested to one standard either EN 60950 or EN 60065 together with IEC Guide 112 as the product is a multimedia equipment having an antenna and a telecommunication connection If a part of the apparatus is already certified for example PSU this part has to be reassessed to the standard used for the whole apparatus either EN 60065 or EN 60950 If there is sufficient detail available of the test results for the existing certification it might not be necessary to carry out full testing to the second standard Case 2 LCD multimedia screen with separate PSU pre certified a If the manufacturer intends to sell the combination screen plus PSU together the PSU has to be listed in the test report and both items of apparatus have to be assessed according the same standard b If the manufacturer does not intend to sell the screen together with a specific PSU it has to be mentioned in the test report what kind of PSU was used during the tests and the limits for voltage and current have to be specified isi lee a CCA certificate can be issued for separate power The 91 24 supply units fo r office machines and information Decision technology
26. for maximum operating temperature as well as manufacturer s data for input and output currents It should be ensured that the optocoupler is operating within its design parameters A declaration with adequate information from The 95 22 E Chm 5 95 9 21 the equipment manufacturer is accepted to decision classify insulating materials Information from the UL Yellow Book may be taken into account In the case of different insulating systems the mate rial with the lowest operating temperature is governing the total operating temperature of the system For the acceptance of coils of RFI filters Table 16 The 98 7 E Chm 5 98 9 15 condition 5 should be taken into account With decision reference to Condition 5 of Table 4A temperature limits on individual coils being part of RFI filters can be accepted according to component rating uire is sub clause are applica 93 9 A GB 3 93 6 17 i i es This decision for the 2nd Ed deleted because of Decision 04 14 EE Sec 1 04 148 the updating of the standard deleted Following construction is accepted The 91 21 EA FI 1 91 4 12 3 There are openings in the bottom of a fire decision enclosure that are larger than 40 mm 2 Above these openings there is a printed board which is horizontally mounted The components are on the upper side of the printed board The printed board fulfils the requirement of V 1 material This decision is applicable to equipment with a Addition to EE Chm 5 96 6
27. ike is to be located adjacent to the resistor or use of cross reference in theservice documentation as described in 1 7 6 last paragraph The component shall be available as spare part in the countrywhere the appliance is sold And in addition a data sheet is provided showing all the relevant data for the resistor Comments Dee __Document Ret item The decision 93 4 EA GB 3 93 EE Chm 7 99 9 1 Clause 5 5 Table A 7 oe aeons 1 5 2 Standard EN 60950 2000 IEC 60950 1999 Description of EE Chm 3 02 10 3 and IEC 60950 1 2000 situation Subject acceptance of UL CSA certified units in end use racks equipment When evaluating end use equipment like large telecom racks composed by several units drawers for building in like computer machines modems routers etc for national mark certification or ENEC or IECEE CB the separately approved units computers modems etc bearing a CCA mark are accepted with limited investigation e g consisting in the check of compatibility of the certification ambient temperature with the end use equipment specified ambient input voltage rating with the one of the end use equipment etc they will then subjected to the end use equipment tests e g electric strength total leakage current capacitor discharge etc Which is the delegate position in regard to the The question acceptance of UL Listed or CSA Certified drawers no CCA mark no CB report in s
28. imum or the complete transformer including the tape meets Appendix A2 test A2 will be deleted with Amendment1 E Small openings in small electromagnets motors The 93 17 EA GB 3 93 6 35 etc should meet the requirements of 4 6 decision Small parts of HB materials in a fire enclosure can The 95 20 EE Chm 5 95 9 19 be accepted based on the judgement that they decision have adequate spacings from ignition sources If the product enclosure is made of HB material The 95 21 EE Chm 5 95 9 20 there have to be internal fire enclosures for parts decision where the limited power source output criteria are not met If the battery is within a fire enclosure we could The 99 5 EE Chm 7 99 9 13a accept a material HB or better based on the decision experience in 4 4 3 3 of EN 50091 1 1 4 7 2 1 Parts requiring a fire enclosure The EE Chm 3 02 10 13 Some apparatus powered only by batteries are not situation required to have a fire enclosure because beyond the batteries the power is limited by PTCs or other devices according to 2 5 However the batteries are not power limited therefore fire enclosure is needed Do you agree to consider the metal can of the The battery acting as fire enclosure question The metal case of the battery can be considered The 02 15 as fire enclosure but the battery has also to decision comply with 4 3 8 4 Materials of coil formers and partition walls shall The 91 22 EA FI 1 91 4 12 3 fulfil the requirem
29. ith one resistor two resistors One resistor across the TNV barrier is allowed provided that the tests of Scl 6 1 2 1 and 6 2 are passed and the requirements for cre epage distances and clearances and the requirements of Scl 5 1 8 are fulfilled If the rated voltage marked on the equipment exceeds 250 V then the components should also be suitable for this voltage Laptop computers which are supplied by SELV and in which hazardous voltages are generated cannot be Class III and therefore must be Class or Class Il If they are designated Class II the double square symbol shall be required It was agreed that a lap top or notebook computer supplied from SELV circuits and in which circuits at voltages which exceed 42 4 V peak or 60 V d c complying as limited current circuits is considered to comply with the definition of Class IIl equipment Only the one set voltage of an internal voltage regulating device should be indicated on the outside Safety related components shall be marked with a trade mark logo and an identification number or code For a component without independent certification that is dedicated for use in one or more specific models the identification may be ina form of a code Safety relevant documentation has to be as a hardcopy The Users Manual may also be on a diskette Perera fa situation The question The decision The decision A comment The decision The decision 02 12 96
30. ndersen of Document No NEMKO will bring the matter of Ref Item 05 3 software controls to the attention of EE Chm 1 2005 10 7 IEC TC 108 HBSDT Standard s Sub clause s EN 60950 2000 and EN 5 3 60950 1 2001 Subject Key words To Safety depending on software f OSM EE control for compliance with EN 60950 Question An integrated circuit is used as protection against overcharging of a lithium battery The circuit has a register which can turn on a charge circuit causing problems with accepting this part because failures in software is not specified in 60950 and when doing testing in single fault condition and at the same time having in this particular case the software controlled charge circuit turned on compliance with IEC 60950 in this case for a lithium battery in single fault condition causes failure with clause 5 3 How do delegates treat software control for compliance with EN 60950 Decision As software evaluation is not part of EN 60950 1 OSM EE is of the opinion that software control can not be considered as part of a safety protection system Explanatory Notes
31. parts of the equipment Document Ref item EE Chm 3 03 Comments Unearthed conductive parts and The situation 6 2 non conductive parts of the equipment continued continued expected to be held or touched during normal use for example a telephone handset or a keyboard Parts and circuitry that can be touched by the test finger figure 2A see 2 1 1 1 except contacts of connectors that cannot be touched by the test probe figure 2C see 2 1 1 1 An SELV CIRCUIT a TNV 2 CIRCUIT ora LIMITED CURRENTCIRCUIT provided for connection of other equipment The requirement for separation applies whether or not this circuit is accessible These requirements do not apply where circuit analysis and equipment investigation indicate that safety is assured by other means for example between two circuits each of which has a permanent connection to protective earth 03 4 5 1 8 Is it necessary for compliance to perform the test The question according to 6 2 2 1 impulse test or 6 2 2 2 steady state ES test or can we accept this situation without testing if the following applies Separate approved surge suppressors are provided which limit an incoming transient voltage to a level of max 70 V before the resistor Circuit analysis shows that this will never result in a hazardous voltage on the RS 232 port SELV If it is obvious that the product will fulfil the The decision requirements no test is necessary Otherwise the
32. rced insulation shall also be The 91 6 EA F1 3 91 required between wires in SELV circuits and metal decision parts with hazardous voltages inside the equipment The text because of the wording of the standard EE Chm 1 94 A was deleted from the Decision No 91 6 at the 1994 meeting Sub clause 2 1 1 4 also leads to 3 1 4 which in turn leads to 2 10 5 Products which are considered completely The 91 1 EA F1 3 91 hazardous when covers are removed do not need decision 2 additional protection e g monitors Opening of an enclosure of a monitor is considered to be intentional because inside the equipment there are not parts which need servicing but repairing SELV circuits can be connected to non SELV The 91 1 EA F1 1 91 circuit if the equipment still complies with the decision 6 requirement of Scl 2 2 in case of single fault condition E DC centralized battery systems Voltage in The EE Chm 3 03 Telecommunication Central offices situation Following the IEC TR 62102 Annex B a 75 V d c The 03 5 stationary battery system is considered TNV2 and decision double or reinforced insulation from the mains is required The installation instructions should provide guidance on how to ensure that the system will not become hazardous after a single Confirmed fault according to 1 7 2 by WG7 of TC108 Frag ca 2 2 5 Untlthe standardis changed condition 2 to table 9 shouldbe readas follows See 2 5 below Ref iy De
33. should be sufficient ee documentation of the certification of the component and the IEC or CENELEC standards used Nevertheless the appropriate use of the component has to be checked For Capacitors the edition of the standard should be given Capacitors certified to IEC 60384 14 1 ed will be The EE Chm 5 95 9 3 accepted for 5 years after DOW of EN 132400 decision Capacitors certified to IEC 60384 14 2 ed and or EN132400 are acceptable Y1 and Y2 capacitors are accepted across basic insulation Y1 and Y2 capacitors are accepted across supplementary insulation The enclosures of Y1 capacitors are considered to comply with the requirements for reinforced insulation with the exception of the area near to the leads where the insulation becomes thinner Only the white area is to This EE Chm 5 97 be considered as decision reinforced insulation supplement s Decision No 95 9 nH Subclause 1 5 7 2 establishes the principle that two resistors can be conn ected in series across a double reinforced insulation provided the are the same value they each comply with the creepage and clearance requirements and the accessible circuits comply with the Limited current circuits requirements Subclause 6 1 2 1 indicates that components across the barrier can be removed during the electric strength test provided the circuit complies with the 10mA limit during the test described in figure 6A Is it possible to bridge a TNV barrier w
34. stricted access locations When applying these new requirements the unit would pass the touch current requirements even when the touch current is higher than 3 5 mA Is it acceptable to apply already these new The question conditions beforehand so that this type of professional eq uipment can be judged compliant with the intention of the safety standard Could we use a kind of text to introduce in the remarks area of the test report It was agreed that equipment with touch current The decision exceeding 3 5 mA may be permitted but only if the equipment complies with the requirements of 5 1 7 of the draft Edition 2 of IEC 60950 1 as shown in the IEC Document 108 100 CDV This decision is as written in theamendment to Comment the minutes of the meeting 5 3 Fault condition tests shall be carried out with 16 A decision 91 18 A FI ee 4 11 1 installation fuses 5 3 Fault condition tests shall be considered and they aed decision 91 2 labia 3 91 3 5 have to be done even in the secondary circuit if there is a risk of damage to supplementary or reinforced insulation According to EN 60127 a fuse will not break The decision 95 5 E Chm 5 95 5 1 17 within 30 minutes at less than 2 1 times the rated current Therefore if the current through the fuse does not exceed this value after the failure is introduced the fuse will not blow and the test is run until steady state conditions are obtained PTC resistors which are certifie
35. tests have to be performed due to Confirmed by the requirements of 6 2 2 3 TC108 WG7 End osm e Sec 2 2004 EN 60950 Decisions 1991 2004 THE DECISIONS MADE AT THE YEAR 2005 OSM EE MEETING EN60950 AND EN60950 1 Dec Comments Document No Ref Item 05 2 EE Chm 1 2005 10 4 Standard s Sub clause s EN 60950 2000 and EN 1 5 4 5 and 5 3 60950 1 2001 Subject Key words To Temperature controllers OSM EE and fan speed controllers Question Shall temperature sensing devices NTC devices used as fan speed controllers be listed as critical components when they are operating under normal conditions Decision Short circuit or opening the NTC and other relevant fault tests in the temperature sensing circuit should be applicable tests Then it is a 5 3 issue blocking the fan The situation has to be evaluated from case to case If the NTC protect against excessive temperatures it has to be evaluated as a safety critical component and must then be listed Explanatory Notes A thermal controller for power supply fan would not be evaluated like a thermostat in a heating element 1 5 3 This circuit should be evaluated like other circuits for function and safety purpose such as heat sink sensors and fixing sensors in printers which will be evaluated in normal operation and also with blocked fan and other relevant fault tests in the temperature sensing circuit Dec Comments Mr A
36. ther piece attaches to the projector with screws Both halves go together by aligning each half to a specified feature and twisting them into position The halves are locked into place by turning knurled screws with finger pressure Mounting and un mounting the units do not require the use of tools Do the delegates agree that if the projector can be fixed to the ceiling by any manner even without requiring the use of tools the product must be considered as fixed and therefore the fire enclosure must be rated 94 5V For projectors specified b y the manufacturer for ceiling mounting with or without a tool the fire enclosure must be rated 5V or better However see Decision 04 6 below Comments ea The decision 93 13 EA GB 3 93 Addition to decision EE Chm 1 94 The situation EE Chm 3 02 The question The decision Comment Document Item 6 23 6 15 10 13 Clause 4 7 3 2 Comments EN 60950 3 rd edition and EN 60950 1 Applicability Decision 02 16 states For projectors specified by The the manufacturer for ceiling mounting with or situation without a tool the fire enclosure must be rated 5V or better Is this applicable to any other type of equipment Question 1 mounted on a vertical surface and or suspended under any other surface How would the delegates determine the fire Question 2 enclosure V 1 or 5V for the following small equipment intended for desktop use and or to be
37. uch racks when the certification Standard was UL 1950 3rd edition based on IEC 950 2nd Ed or UL 60950 based on IEC 60950 3rd Ed as long as all the differences between the UL requirements and the IEC based Standard and between the IEC based Standard and the current IEC Standard used for the end use equipment have been checked and satisfied In consideration of the use of the IEC based KEMA s Standard the UL CSA certified components proposal computers modems etc may be accepted in end use equipment provided that in addition to the check of the suitability with the end use equipment the differences between the UL requirements and the IEC based Standard and between the IEC based Standard and the current IEC Standard and EN if applicable used for the end use equipment have been checked and satisfied In the report for end use equipment these drawers may be referenced in the critical component list with Model No Mfr electrical rating etc with no need to list all their parts transformer capacitors etc All critical components have to be certified to the The decision 02 11 relevant EN or IEC component standard Acceptance of components has to follow CCA 228 1 Recognition of componerts In the special case mentioned we need a testreport and a certificate showing compliance to EN 60950 so Ts diia fa ees There is no need for a CCA approval for every 95 1 EE Chm 5 95 5 1 2 single component There
38. unt when checking the compliance with Sub clause 4 7 3 In the flammability assessment of PCBs a declaration that the manufacturer uses V 0 or V 1 rated PCBs as required is acceptable The test report should detail material manufacturer type reference and flammability rating as a minimum for other materials In cases where the equipment manufacturer is unable to obtain the appropriate information due to the unwillingness of the component manufacturer to divulge proprietary data acceptance may be based on either 1 a Certificate of Conformity C of C or 2 awritten declaration from the component manufacturer The C of C or declaration shall confirm the flammability rating of the plastic materials However this exception is not allowed for enclosure materials These must also meet the requirements of clause 4 2 Mechanical strength and stress relief Comments a Document The EE Chm 3 02 situation with questions Comment The decision The EA FI 1 91 decision Addition to EA GB 3 93 decision Addition EE Sec 1 04 93 18 amended Addition to EE Chm 1 94 decision Addition to EE Chm 5 95 decision Item 12 1 4 12 1 6 39 14 9 6 16 Clause Comments Document Ret item Components may be considered to have individual The 96 5 EE Chm 5 96 6 23 fire enclosures decision Thin tape can be used to provide a fire enclosure for transformer windings etc provided the tape meets V 1 min
39. y To be able to accept one fuse marking in Europe in the USA and in Canada markings mA and A can still be accepted Therefore the following kind of markings are accepted T315 mA LF4 AH 250 V 250 V ae Item kaa k Lo 7 99 9 3 decision See below for amended decision The EE Chm 1 01 6 2 01 8 situation 91 11 EA FI 1 91 4 5 A proposal The amended decision The situation The decision Re 1 7 8 3 It is not acceptable to mark I and 0 ona The EA GB 3 93 functional switch of a lap top or notebook decision computer where for example the charging circuit is energised at all times If marked it should be I and stand by 9 Nee No marking at all is acceptable Decision The marking POWER is not acceptable Testing houses shall put a note in the test report The 91 2 mentioning in which language the markings decision 5 regarding safety have been checked Safety markings in all official languages of CENELEC countries need not be checked when the CCA certificate is issued EA FI 3 91 Lithium batteries includ ed in integrated circuits are The 95 1 EE Chm 5 95 not considered as replaceable decision 3 There must be advice in the service manual concerning the disposal of these parts 2 1 1 A modem card if it is separately sold and intended The 99 4 EE Chm 7 99 for use in operator access areas has to be tested decision for the relevant protection of TNV circuits Double or reinfo
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