ceb specification direct connected static poly phase energy meter of
Contents
1. 5 1 4 3 GSM and GPRS Communication module If requested by CEB The GSM and GPRS Communication modules shall be supplied fitted to the meter as specified in the price schedule It will be powered from the meter Alternatively a separate GSM and GPRS module and a power supply for the GSM and GPRS module to operate from available LV supply as per the operating voltage given under clause 5 0 would be acceptable The module shall have i 1800 GSM GPRS Modem or Dual band GSM GPRS modem 900 1 800 MHz ii Tamper proof SIM Card Holder CEB SPESIFICATION R1 DSMSL PROJECT iii A built in connector for and external antenna iv Minimum speed of 9600 bps 5 1 4 4 Remote Electricity Metering Software A user friendly window based GUI software shall be supplied on a CD with the meters in order to program the meters locally and remote and to download the data from the remote GSM and GPRS facilitated meters The software shall have the facility to communicate via a GSMGPRS modem connected to the PC Relevant manuals shall be provided The download data shall be stored in a Microsoft Access SQL or similar database A delimited text file or MS Excel format is also acceptable 5 2 Mechanical Reguirements The meter shall be designed and constructed in such a way as to avoid introducing any danger in normal use and under normal working conditions so as to ensure especially a Personal safety against electric shock b Personal safety a2. xvi Clause 5 0 Basic Features p Yes No xvii Clause 5 0 Basic Features g Yes No xviii Clause 5 0 Basic Features 0 Yes No xix Clause 5 0 Basic Features p Yes No xx Clause 5 0 Basic Features q Yes No 23 Battery of the meter i Type and model of the battery ii Whether it is recharging when main supply is available yes no iii Replaceable without breaking manufacturer seals iv Guaranteed life span at related climatic conditions in years 24 Time Clock i Type of the crystal used ii Accuracy of the clock at 30 C seconds month 25 Whether the meter can be programmed remotely Yes No 26 Whether the display is non volatile memory type Yes No Memory retention period Months 27 Whether the Certificate of quality Assurance Conforming to ISO 9001 2008 furnished Yes No 28 Whether the activity indicator provided flashing light Yes No 29 Whether the Blinking LED analogues to the watt hour consumption provided Yes No 30 Indicate the extra facilities available with the meters attach separate sheet 31 32 Whether the Acceptance sample Tests as per Clause 10 2 will be carried out by the Manufacturer Yes No Warranty Period 15 CEB SPESIFICATION R1 DSMSL PROJECT 33 Whether remote reading of meter is possible via a GSM connection Yes No If applicable only 34 Whether the Softw
3. 2 Standard Basic Current and Maximum Current For Direct Connected PPM with kVA measurement The Meters shall be suitable for operation on standard basic current of 10A and maximum current of 100A 5 1 3 Meter Reading Programming Software User friendly windows based Graphical User Interface GUI software shall be supplied on a CD with the meters in order to program and download data from the meters The relevant user manual for the software shall be provided All the features that the meter supports shall be accessible through a proper licensed version of the same software This software shall be provided along with the sample of the bid in order to explore the capabilities of the provided sample 5 1 4 Remote Communication 5 1 4 1 General Requirement The meters shall be able to access from software running on a Personnel Computer with operating system widows XP or above Method of communication between the communication module and the PC modem shall be data enables GSM and GPRS 5 1 4 2 Remote reading Facilities shall be available to do the following tasks for each of the meter by remote operation via both GSM and GPRS connection i To program each meter ii To take the relevant meter reading for each meter separately iii To reset the maximum demand value iv To get and error message when the meter is faulty and the date and time of occurrence of fault v To download stored data from meter Load surveyors event logs etc
4. Fire The terminal block the terminal cover and the meter case shall not ignited by thermic overload of live parts in contact with them and they shall meet the tests stipulated in Clause 5 8 of IEC 62052 11 5 2 5 Protection against penetration of dust and water The Metering eguipment shall be suitable for indoor use and conform to the degree of protection of IP51 and IP 65 further as per IEC 60529 5 2 6 Display of measured values The meters shall be provided with a clear Electronic Display under a viewing panel conform to the degree of protection of IP 65 and the dimensions of figures shall not be less than 6 mm Height and 4mm Width Minimum number of digits shall be 7 including a decimal The meters shall have non volatile memory type electronic display The non volatile memory shall have a minimum retention time of twelve months The principal unit for the measured value shall be the kilowatt hour kWh kVA and kVarh If applicable 5 2 7 Output device The Meters shall have a test output device outlet port accessible from the front and capable of being tested with the help of the universal reference standard meter and the programming unit PC with the help of a software package and the software testing the meters shall also be supplied with the meter It shall provide an error message when the meter is faulty and the date it becomes faulty 5 2 8 Data cable to connect meter with a PC Data cable to connect the meter wit
5. any i Spring Hammer Test Yes No ii Shock test Yes No iii Vibration Test Yes No iv Test of resistance to heat and fire Yes No v Tests of protection against penetration of dust and water Yes No vi Tests of climate influence Yes No vii Dry heat test Yes No viii Cold test Yes No ix Damp cycle test Yes No x Solar radiation test Yes No xi Test of electrical requirements Yes No xii Test for electromagnetic compatibility Yes No xiii Test of Accuracy requirements Yes No 22 Whether the meters conforming to the following Clauses Indicate the deviations if any 14 CEB SPESIFICATION R1 DSMSL PROJECT i Clause 5 0 Basic Features a ii Clause 5 0 Basic Features b iii Clause 5 0 Basic Features c iv Clause 5 0 Basic Features d v Clause 5 0 Basic Features e Yes No vi Clause 5 0 Basic Features f Yes No vii Clause 5 0 Basic Features g Yes No Clause 5 0 Basic Features h Yes No viii na ix Clause 5 0 Basic Features i x Clause 5 0 Basic Features j xi Clause 5 0 Basic Features k Yes No xii Clause 5 0 Basic Features l Yes No xiii Clause 5 0 Basic Features m xiv Clause 5 0 Basic Features n Yes No SS a IS a Yes No Yes No Yes No Yes No Yes No Yes No Yes No xv Clause 5 0 Basic Features 0 Yes No
6. new or repaired meter s free of charge to the original contract delivery point unless otherwise arranged within 03 months period from notification Any unauthorized handling repairs or alterations to the meter s shall invalidate this warranty If it is found that the meter has been mishandled neglected and or modified in any way during the storage period the warranty in general will become null and void The warranty applied only to goods and services carried out by the Manufacturer or with the Manufacturer approval Yours faithfully 17
7. with regard to the performance of the meters 7 3 Warranty Manufacturer shall provide three year comprehensive warranty from the date of FOB dispatch of the meters to the purchaser Manufacture should forward the duly signed Warranty Certificate together with the letter of acceptance of the award of contract The format of the Warranty Certificate is given in the annex B When the meters become defective they should be replaced free of charge 7 4 Marking of Meters 7 4 1 The Name Plate of Meters shall bear all the information stipulated in clause 5 12 of IEC 62052 11 The marking shall be indelible distinct and readable from outside the meter 7 4 2 The words Property of the Ceylon Electricity Board CEB with a mark Warranty 3 Y shall be engraved on the nameplate 7 4 3 A serial number which will be indicated at the time of placing an order shall also be engraved on the nameplate 7 5 Packing Each meter shall be individually packed in a cardboard box using bubble wrapping to prevent damage due to rough handling and minimum of 5 meters shall be packed in cardboard boxes Each box shall indicate the type LV Rating and serial Nos of the meters All packing materials shall be of bio degradable type 10 8 0 CEB SPESIFICATION R1 DSMSL PROJECT INFORMATION TO BE SUPPLIED WITH THE OFFER The following shall be furnished with the offer a b Catalogues describing the equipment and indicating the type and mod
8. CEB SPECIFICATION DIRECT CONNECTED STATIC POLY PHASE ENERGY METER OF ACCURACY CLASS 1 TF CEYLON ELECTRICITY BOARD SRI LANKA Telephone 94 11 232 0953 Fax 94 11 232 393 CEB SPESIFICATION R1 DSMSL PROJECT CONTENTS Page 1 Scope 2 2 System Parameters 2 3 Service Conditions 2 4 Applicable Standards 2 5 Basic Features 3 6 Quality Assurance 9 7 Additional Requirements 9 9 Information to be supplied with the offer 11 10 Inspection and Testing 13 11 Technical Literature and Drawings 13 Annex A Schedule of Guaranteed Technical Particulars 14 15816 Annex B Warranty certificate 17 CEB SPESIFICATION R1 DSMSL PROJECT SPECIFICATION FOR DIRECT CONNECTED STATIC POLY PHASE ENERGY METERS OF ACCURACY CLASS 1 1 0 SCOPE This Specification covers the general reguirements of the design manufacture operation and testing of Direct Connected Static Poly Phase Energy Meters of Accuracy Class 1 Following meter is covered under this specification Direct Connected PPM with kVA demand Including With remote reading facility The meter shall have facility to program amp read using a PC through an USB connection 2 0 or above Alternative connections are acceptable if the cable amp necessary modules for connection to a PC are provided with the meter Meter shall also have communication facility amp take meter reading remotely via a GSM and GPRS network The GSM and GPRS Communication module amp other access
9. and they shall be descriptive and self explanatory complete with necessary connection diagrams and drawings 13 CEB SPESIFICATION R1 DSMSL PROJECT SCHEDULE OF GUARANTEED TECHNICAL PARTICULARS ANNEX A Bidders shall complete and submit with the bid the schedule of technical particulars given below for each rating Name of Manufacturer 8 Country of manufacture Class of Meter 8 Model No Catalog Ref No Type 3 phase 4 wire 3 phase 3 wire Applicable Standards Standard Basic Current Rated Maximum Current Imax Reference voltage and operating range Starting Current of Meter 00 SI gt 01 co N Limit of errors when operating in the full power factor range If applicable only Reference Temperature and Temperature coefficient Insulation Level i Insulation Withstand voltage for 1 min ii Impulse Voltage 10kV 1 2 50u 12 Power Losses 13 Temperature rise as per IEC 62052 11 Type of register 15 No of digits 16 Size of numbers 17 Type of Meter and Terminal Base 18 Type of Meter cover and Terminal cover 19 Maximum size of conductor that can be connected to the Terminals 20 Degree of protection IP Category 21 Whether the following Type Test certificate as per IEC 62052 11 and IEC 62053 21 furnished in complete form from Recognized Testing Authority indicate the deviations if
10. are as per clause 5 0 f and Clause 5 1 3 including relevant manuals is provided Yes No I We hereby certify that the above particulars are correct Seal and Signature of the Manufacturer Date 16 CEB SPESIFICATION R1 DSMSL PROJECT Annex B Warranty Certificate General Manager Ceylon Electricity Board 50 Sir Chittampalam A Gardiner Mawatha Colombo 2 Sri Lanka Jada M katat 9 hereinafter called the Manufacturer shall make good by repair or at our option by replacement detects which under proper use and in accordance with any instructions issued by us as appeared in the contract of our supply or manufacture within a period of not more than thirty six 36 months after the original FOB dispatch date when the meters become defective within first three years of warranty they shall be replaced free of charge a All meters having Serial Nos From TON seis Mata supplied by the Manufacturer for the CEB Bid No is handled installed and commissioned in a manner as agreed to by the Manufacturer and the Ceylon Electricity Board and operated at the designed normal operating conditions at all times for which it was intended We are notified of the alleged detect first coming to the purchaser s notice and within the warranty period The defective meter s is are returned promptly to our Agent in Sri Lanka free of charge if we so require and we shall return
11. control equipment and systems or DNP 3 0 or latest versions of them 5 0 BASIC FEATURES Direct Connected PPM with kVA demand The Static Three Phase Energy Meters shall be capable of measuring and recording kWh kVArh kVA maximum demand and power factor The accuracy class of the meters shall be Class 1 for Active Energy kWh and Class 2 for reactive Energy kVArh a b The meter shall operate with specified accuracy for power factors in the full range of all quadrants The Meter shall be of the surface mounting type and shall have terminals at the bottom The meters shall be a programmable type suitable for recording active energy transaction import and export in kilowatt hour kWh kVarh in phase wise as well as summation and maximum demand kVA The meters shall be suitable for Multiple tariff metering minimum of 04 nos of tariff readings available The meters shall record the monthly transaction generally every 30 days along with the cumulative consumption of kWh and kVarh separately and the maximum kVA demand over a demand integration period of fifteen 15 minutes for the 30 day period History of transaction kWh kVA including occurrence date and time and kVarh of the previous month shall be displayed in the auto display mode Further user shall have the facility to program the automatic reset date billing date of the meter It shall be possible to program including automatic billing re
12. el number Comprehensive hardware and software manuals should be provided along with the offer Hardware reference manual should comprehensively describe all hardware features available in the offered meter Software reference manual should provide the detailed guidelines how to program the meter as per the client s requirement Literatures which describe measuring principles of kWh kVar and kVA also should be furnished with the offer if applicable Constructional features materials used for components and relevant technical literature Complete dimensional drawings Manufacturing Experience and list of purchasers as stipulated in clause 6 1 and 6 2 above The details of the information that will be indicated on the Name Plate of the Meter as stipulated in Clause 7 4 above Completed Schedule of Guaranteed Technical particulars ANNEX A Quality Management System certification that conforms to ISO 9001 2008 The following Type Test Certificates conforming to IEC 62052 11 and IEC 62053 21 from a recognized testing authority acceptable to the purchaser who have obtained ISO 17025 accreditation for electricity meter testing shall be furnished i Tests of mechanical requirements a Spring Hammer Test b Shock test c Vibration Test d Test of resistance to heat and fire e Tests of protection against penetration of dust and water ii Tests of climatic influence a Dry heat test b Cold test c Damp heat cycle test i
13. ers and Bidder shall furnish documentary evidence to prove this with the offer 7 0 ADDITIONAL REQUIREMENTS 7 1 Manufacturing Experience a The manufacturer shall have at least 10 years of experience in the manufacture Static Electronic Poly Phase Kilowatt hour kWh Meters of Accuracy Class 1 to the IEC 62053 21 The manufacturer shall furnish sufficient documentary evidence in the bid to prove his manufacturing experience b The Meters shall be rugged construction proven design and reliable so that the meter shall operate within the stipulated error limits for a period of 10 years CEB SPESIFICATION R1 DSMSL PROJECT 7 2 Performance 7 2 1 Certificates for service life Ofgem certification on other certification issued by an electricity regulating Institution certifying a minimum service life of 5 years certified copies of the certificates shall be attached to prove this 7 2 2 Additional requirements a The manufacturer shall have supplied static electronic poly phase energy meters to a minimum of 10 Electricity Authorities Utilities out of which at least 3 are from outside the country of manufacture during last 8 years b The manufacture shall furnish a list of Authorities Utilities to whom meters were supplied during the past eight years indicating their names and addresses clearly C The purchaser reserves the right to communicate with Electricity supply authorities utilities to whom meters have been supplied
14. es of parts of certificates will not be considered Offers of bidders who fail to furnish the above particulars in full as stipulated in clause 8 0 shall be rejected INSPECTION AND TESTING The selected bidder shall make necessary arrangements for inspection by an Engineer appointed by the purchaser and to carry out in his presence necessary sample acceptance tests on the Meters offered as stipulated in Clause 10 2 9 2 Acceptance Sample test The following test as per IEC 62052 11 and IEC 62053 21 shall be witnessed by the representative of the Purchaser 12 CEB SPESIFICATION R1 DSMSL PROJECT a Test of insulation properties i A C Voltage Test b Tests of Accuracy reguirements i Test of meter constant ii Test of starting condition iii Test of no load condition iv Test of influence quantities v Limits of error due to variation of current Extra copies of the acceptance test report shall also be supplied with the meters 9 3 Routine Test Routine tests as per IEC 62052 11 shall be carried out on all meters and each consignment of meters shall company one set of routine test results recorded in tabular form If the test results are recorded in separate sheets all such sheets pertaining to each consignment shall be bound together as one volume 10 TECHNICAL LITERATURE AND DRAWINGS Technical Literature in English language on the installation calibration and maintenance shall be supplied with each set of meters
15. gainst effects of excessive temperature C Safety against spread of fire d Protection against penetration of solid objects dust and water All parts which are subjected to corrosion shall be suitably protected and any protective coating shall not be liable to damage by normal handling 5 2 1 Case and window The meter shall have an insulated case which shall be sealed in such a way that the internal parts of the meter are not accessible to unauthorized persons Any non permanent deformation of the case shall not affect the satisfactory performance of the meter The window shall be of transparent polycarbonate material which cannot be removed undamaged without breaking seals 5 2 2 Terminal Block The terminal block shall be made of insulating material and it shall be capable of passing the test stipulated in ISO 75 for a temperature of 135 C and a pressure of 1 8 Mpa The terminals should accommodate a cable of cross section 35mm 5 2 3 Terminal Cover The wiring terminals shall be protected by a sealable transparent terminal cover and the terminal cover shall be made of an insulating material The terminal covers shall be of extended type with easily breakable knockouts or suitable hole arrangements to insert cables if necessary through separate U grove covering removable part Provision shall be made to seal the meter cover and terminal cover separately CEB SPESIFICATION R1 DSMSL PROJECT 5 2 4 Resistance to Heat and
16. h a PC or a laptop with the meter for the purpose of data downloading programming of the meter shall be provided Minimum length of the cable shall be 2m and Number of units to be provided is as per the bid data sheet 5 2 9 Marking of meter Connection diagrams and Terminal Marking Every meter shall be provided with a Name plate incorporating the information as per and the meter terminals shall also be marked Every meter shall be indelibly marked with a diagram of connections and this diagram shall also show the sequence for which the meter is intended preferably inside the meter terminal cover 5 3 Climate Condition a Temperature range The operating Temperature range of the Meters shall conform to the table 5 of IEC 62052 11 for indoor meters b Relative Humidity The meters shall be suitable for indoor operation in a humid tropical climate condition with the relative humidity as stipulated in clause 3 0 CEB SPESIFICATION R1 DSMSL PROJECT 5 4 Electrical reguirements 5 4 1 Power Consumption The active and apparent power consumption in the voltage and current circuits of the meters at a reference voltage freguency temperature and rated current shall not be more than that stipulated in table 1 and 2 of IEC 62053 21 5 4 2 Influence of Supply Voltage a Voltage Range The normal operating voltage range of the meters shall be as stipulated in Table 4 0 of this spec and the permissible error due to voltage varia
17. ii Test of electrical requirements a Test of power consumption b Test of influence of supply voltage c Test of influence of short time over current d Test of influence of self heating e Test of influence of heating 11 f 9 h CEB SPESIFICATION R1 DSMSL PROJECT Test of insulating properties Impulse voltage test A C voltage test iv Test of electromagnetic compatibility Zoga Test of immunity to electrostatic discharges Test of immunity to electromagnetic RF fields Fast transient burst test Radio interference suppression v Test of Accuracy requirements eee oe Test of influence quantities Test of ambient temperature influence Test of no load condition Test of starting condition Test of meter constant Limits of error due to variation of current vi The Type Test Certificates shall clearly indicate the following Tar Hao TH OT 9 1 Inspection Name address and country of the testing authority Date of testing Name of eguipment type tested Number of pages of the type test certificates Manufacturers identify Catalogue reference number etc Basic parameters The Standard to which the equipment type tested Comments and observations of the testing authority The type test shall be performed at a reference voltage of 230V 415V at a reference freguency of 50Hz The type test certificates shall be submitted in complete form as furnished by the testing Authority Incomplete type test certificat
18. ng time of the parameters available in the auto display shall be programmable Display should have facility to read readings even at the absence of the input power Other than push button operation is preferred The meter shall be suitable for LV operations as follows Operation Voltage 400V 3 phase 4 wire system Voltage transformer ratio Direct connection Current transformer ratio Direct connection Standard Basic Current 10A Maximum current 100A Frequency 50Hz p The meters shall directly display in auto display mode the following data as applicable at the time of reading calling when required Instantaneous voltage Volts Line Phase Instantaneous current Amps on each phase Cumulative Active Energy kWh Cumulative Reactive Energy kVArh and Maximum Demand kVA Previous month billing data kWh kVarh MD kVA and MD occurrence date and time Phase Sequence Note Add drop facility of other parameters shall be provided through the programming software in to the Auto and Manual Display push button q The meters shall have facilities to store a minimum of twelve months data and to display the necessary data when required CEB SPESIFICATION R1 DSMSL PROJECT 5 1 General Reguirements 5 1 1 Standard Reference Voltages and Frequency The meters shall be suitable for operation on 400 Volt three phases 50 Hz four wire system applications 5 1
19. ories required for remote meter reading shall be supplied with the meter if requested It should be possible to replace the communication unit at site without breaking the meters alternative seals 2 0 SYSTEM PARAMETERS System Voltage 400V System Highest Voltage 415V System Frequency 50Hz Method of Earthing Effectively earthed System Fault Level 25 kA 3 0 SERVICE CONDITIONS Maximum ambient temperature 40 C Maximum relative humidity 90 Annual average ambient temperature 30 C Environmental condition Humid tropical climate with heavily polluted atmosphere Highest altitude from MSL to 1900m above MSL 4 0 APPLICABLE STANDARDS The equipment and components supplied shall be in accordance with the latest editions amendments of the Standards specified below However the CEB specification shall supersede these standards in the event there is a discrepancy CEB SPESIFICATION R1 DSMSL PROJECT S N Standard No Title 1 IEC 62052 11 2003 Electricity metering equipment AC General requirements tests and test conditions Part 11 Metering equipment 2 IEC 62053 21 2003 Electricity metering equipment AC _ Particular requirements Part 21 Static meters for active energy classes 1 and 2 3 IEC 62053 23 2003 Electricity metering equipment A C particular requirements part23 static meters for reactive energy classes 2 amp 3 04 IEC 60870 5 101 Tele
20. s well as electrostatic discharge do not damage or influence the meter b Radio interference suppression The meters shall not generate conduct or radiate noise which could interfere with other eguipment CEB SPESIFICATION R1 DSMSL PROJECT 5 5 Accuracy Reguirements The meters shall be of accuracy class 1 and shall be suitable for operation within the accuracy class limits specified in a tropical climate and service as given in clause 3 0 of CEB Spec a Limits of error due to variation of the current The percentage errors shall not exceed the limits for the relevant accuracy class given in tables 6 of IEC 62053 21 b Limits of error due to other influence quantities The additional percentage error due to the change of influence quantities shall not exceed the limit for the reference accuracy class given in table 8 of IEC 62053 21 c Limits of error due to ambient temperature variation The limits of error shall not exceed the limits given in table 5 of IEC 62052 11 for indoor meters d Starting of meter The meter shall start and continue to register at current shown in Table 9 of IEC 62053 21 for import and export transactions e Meter Constant Sufficient pulse rates meter constant shall be generated at low load condition 6 0 QUALITY ASSURANCE The manufacturer shall have obtained Quality Management System certification conforming to ISO 9001 2008 for the manufacturer of Static Poly Phase kilowatt hour kWh Met
21. setting date download data and reset the maximum demand both locally and remotely through suitable software running on PC The meters shall detect and record current direction reversal as an event with date and time of such occurrence and restoration with phase identification The meters shall be capable of recording occurrence of missing voltage of one or two phases and shall display the all details of tampering and restoration such as sv CEB SPESIFICATION R1 DSMSL PROJECT time and date of occurrence of tampering number of times meter tampered present status etc The meters shall record the consumption accurately irrespective of the phase sequence of supply The meters shall operate normally even in the absence of neutral amp when any two voltage leads are connected The meter shall have a calendar clock to provide time and date information and be equipped with a suitable battery backup The life time of the supplied battery shall not be less than 10 years under normal usage Re chargeable battery with main supply is preferred Flashing light indication shall be available on the front face of the meter which acts as an activity indicator The meter shall also be provided with pulsing outputs which blinks and shall be analogous to the kWh and kVarh metered for testing calibration purposes The number of pulses per kWh kVarh shall be indicated in the rating plate Back light for the LCD display shall be available Scrolli
22. tion shall conform to the table 7 of IEC 62052 11 b Voltage dips and short interruptions Voltage interruptions shall not produce a change in the meter reading as stipulated in Clause 7 1 2 of IEC 62052 11 When the voltage is restored the meters shall not have suffered degradation of the meteorological characteristics c Influence of short time over current The meters shall not be damaged by short time over currents and the meter shall perform correctly when back to its initial working conditions and the variation of error shall not exceed the value indicated in Table 3 of IEC 62053 21 5 4 3 Influence of self heating The variation of error due to self heating shall not exceed the value given in table 4 of IEC 62053 21 5 4 4 Influence of heating The temperature rise at any point of the external surface of the meters shall not exceed 25K with the ambient temperature at 40 C Under normal operating condition the electrical circuits and insulation shall not reach a temperature which might affect the operation of the meters 5 4 5 Insulation The insulation of the meters shall withstand an impulse voltage of 10kV peak and power frequency withstand voltage of 4 kV as stipulated respectively clause 7 3 1 amp 7 3 3 of IEC 62052 11 5 4 6 Electromagnetic compatibility a Immunity to electromagnetic disturbance The meters shall be designed in such a way that conducted or radiated electromagnetic disturbance a
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