Spec Sheet - PVPower.com
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1. SECTION XX Figure 1 3 SCCB 28 420 type 3R Dimensions Combiner Manual 1 Installation 2X 1 83 m 2X 13 50 EN 2X 13 50 I 3X 0 47 ren 0 i 7 3X 43 01 42 23 44 01 pe M o Y 4X 32 X 50 SLOT 30 66 1 12 10 yo SECTION X X Figure 1 4 SCCB 52 416 type 3R Dimensions 2 Wiring Combiner Manual 2 Wiring NOTE The combiner enclosure is shipped with no entry holes A knock out is gt required for the appropriate conduit size SMA recommends wire entry be made from the bottom but there is no restriction other than local code for making wire entries from other locations in the enclosure Input Wiring Refer to Figures 2 1 through 2 4 for the input and output wiring locations of the combiner box PV ungrounded conductors positive in a negative ground system negative in a positive ground system are wired into the outside fuse holder terminals PV grounded conductors negative in a negative ground system positive in a positive ground system are wired into the terminal buses located at the top of the combiner box All PV safety ground conductors are wired into the terminal busses located at the bottom of the combiner box Output Wiring The SBCB 6 circuit combiner box has a 90A DC fault current rating The SCCB 12 circuit combiner boxes has2. Number of Output Wires 2 Positive 2 Negative PV Array Configuration Negative or Positive Grounded Field Wiring 75 Deg C minimum Operating Temperature Range 25 to 50 Deg C Enclosure Type NEMA type 3R 4 Steel Weight 56 lbs approx Dimensions H x W x D inches 20 x 20x 8 Specifications Combiner Manual SCCB 52 Number of Inputs 52 Ungrounded Input Wire Size and 10 to 6 AWG Terminal Torque Value 14 in Ib Grounded Input Wire Size and 10 to 6 AWG Terminal Torque Value 35 in Ib Output Wire Size 6 AWG to 350 kcmil Terminal Torque Value 350 in Ib Max Input Fuse Rating Midget 8 A 600 V DC Max Output Current 416 ADC Max Continuous Output Current 333 ADC Number of Output Wires 2 Positive 2 Negative PV Array Configuration Negative or Positive Grounded Field Wiring 75 Deg C minimum Operating Temperature Range 25 to 50 Deg Enclosure Type NEMA type 3R Weight 70 Ibs approx Dimensions H x W x D inches 42 x 30 x 12 COMBOX UUS093723
3. Operating Temperature Range 25 to 50 Deg C Enclosure Type NEMA type 3R Steel Weight 11 lbs approx Dimensions H x W x D inches 10x8x6 SCCB 12 10 14 16 Circuit may be special ordered Number of Inputs 10 to 16 Ungrounded Input Wire Size and 10 to6 AWG Terminal Torque Value 14 in Ib Grounded Input Wire Size and 10106 AWG Terminal Torque Value 35 in Ib Output Wire Size 6 AWG to 350 kcmil Terminal Torque Value 350 in Ib Max Input Fuse Rating Midget 20 A 600 V DC Max Output Current 200 to 320 A DC Combiner Manual Specifications Max Continuous Output Current 160 to 256 A DC Number of Output Wires 1 Positive 1Negative PV Array Configuration Negative or Positive Grounded Field Wiring 75 Deg C minimum Operating Temperature Range 25 to 50 Deg C Enclosure Type NEMA type 3R 4 Steel Weight 48 165 approx Dimensions H x W x D inches 16 x 16x 6 SCCB 28 18 to 26 Circuit may be special ordered Number of Inputs 18 to 28 Ungrounded Input Wire Size and 10 to6 AWG Terminal Torque Value 14 in Ib Grounded Input Wire Size and 10106 AWG Terminal Torque Value 35 in Ib Output Wire Size 6 AWG to 350 kcmil Terminal Torque Value 350 in Ib Max Input Fuse Rating Midget 15 A 600 V DC Max Output Current 270 to 420 A DC Max Continuous Output Current 216 to 336 A DC
4. ENS 55 BEE 19 6 to 52 Circuit Combiner Boxes SBCB 6 SCCB 12 28 52 ii Combiner Manual Combiner Manual Copyright 2009 SMA America Inc All rights reserved All rights reserved No part of this document may be reproduced stored in a retrieval system or transmitted in any form or by any means electronic mechanical photographic magnetic or otherwise without the prior written permission of SMA America Inc SMA America makes no representations express or implied with respect to this documentation or any of the equipment and or software it may describe including with no limitation any implied warranties of utility merchantability or fitness for any particular purpose All such warranties are expressly disclaimed Neither SMA America nor its distributors or dealers shall be liable for any indirect incidental or consequential damages under any circumstances The exclusion of implied warranties may not apply in all cases under some statutes and thus the above exclusion may not apply Specifications are subject to change without notice Every attempt has been made to make this document complete accurate and up to date Readers are cautioned however that SMA America reserves the right to make changes without notice and shall not be responsible for any damages including indirect incidental or consequential damages caused by reliance on the material presented including but not limited to
5. Example If the Isc of the PV module equals 6 9 Adc then the fuse size is determined by 1 56 x 6 9 10 76 The next standard fuse size would be a 12A 600Vdc fuse DC Disconnect Requirements NEC 690 15 18 allows the use of fuse holders as a suitable means of disconnecting PV arrays for servicing Additional DC disconnects external to the inverter may be required by the local authority having jurisdiction WARNING Never open a fuse holder while it is under load Electrical arcing and damage to the fuse holder will occur if a fuse holder is opened under load PV String Fuses The SBCB SCCB is shipped without PV string fuses SMA America maintains stock of common fuse sizes for the SBCB SCCB products The current rating of the fuse is dependent upon the specific PV module used in the PV array Please contact SMA America to order the appropriate fuses for your project Specifications Specifications SBCB 6 6 Circuit Combiner Manual Number of Inputs 6 Ungrounded Input Wire Size and 10106 AWG Terminal Torque Value 14 in Ib Grounded Input Wire Size and 10 to 6 AWG Terminal Torque Value 35 in Ib Output Wire Size 10 to 1 0 AWG Terminal Torque Value 120 in Ib Max Input Fuse Rating Midget 15 A 600 V DC Max Output Current 90 A DC Max Continuous Output Current 72 ADC Number of Output Wires 1 Positive 1 Negative PV Array Configuration Negative or Positive Grounded Field Wiring 75 Deg C minimum
6. and shipping company that delivered the unit If 1t becomes necessary to return the Combiner use the original packing material If you need assistance in dealing with a damaged unit contact SMA America at 916 625 0870 Input Circuit Configurations The SBCB and SCCB Combiner Boxes are commonly available with 6 12 28 or 52 PV input circuits Other sizes in between 6 and 52 circuits may be special ordered Please allow sufficient lead time when custom ordering Contact SMA America for details 1 Installation Combiner Manual 1 Installation Refer to Figures 1 1 through 1 4 for enclosure dimensions Use appropriate hardware for the mounting surface The weight of the units is shown in the specification list 8 50 2X 2 75 T 2X 3 00 2X 0 47 5 m 6 05 SECTION X X Figure 1 1 SBCB 6 90 type 3R Dimensions Combiner Manual 1 Installation 16 50 2X 1 75 2X 13 00 2X 47 7 TN C 2X 17 00 U n 1606 18 00 eh EO Al ur 6 10 SECTION X X Figure 1 2 SCCB 12 240 type 3R Dimensions 1 Installation Combiner Manual 20 32 2X 3 66 2X 13 00 2X 0 62 7 2X 21 25
7. building codes and the requirements of the authority having jurisdiction WARNING To prevent electrical shock or injury all wiring and com A missioning procedures must be performed by qualified personnel WARNING Before installing or using the Combiner Box read all of the instructions and warnings on the Combiner Box and in this Installation Guide WARNING PV arrays produce electrical energy when exposed to light and thus create an electrical shock hazard This GROUND symbol marks areas in the Combiner Box for connecting E equipment grounds only vi Combiner Manual Combiner Manual Introduction Introduction SMA America has introduced a new line of PV combiner boxes designed for use with the SMA family of inverters Combiner Box features include Listed to UL 1741 for the United States and Canada Simplified input and output wiring Compact low cost design Wall mount NEMA type outdoor steel enclosure NEMA type 4 available for SCCB 12 SCCB 28 Reliable bus work for combined high current conductors Unpacking and Inspection All SMA Combiner Boxes are thoroughly checked before they are packaged and shipped Although they are shipped in sturdy packaging damage can still occur during shipping and delivery It is important to carefully inspect the shipping container and contents prior to installation If you detect any external damage after unpacking report the damage immediately to your SMA dealer
8. PV input fuse holders 15 Amp maximum fuse size 2 Wiring Combiner Manual ETL 306172 1 er ans eem S O U U T el O INPUTS o KA e m 2 P 3 2 55 PV GROUND l e PV UN 2 al 2 A e of 4 4 S OUTPUT Figure 2 2 Combiner Box Wiring SCCB 12 240 12 PV input fuse holders 20 Amp maximum fuse size Combiner Manual 0 0 ETL 3061752 1 PV GROUNDED INPUTS 21599 999 999 1900 000 OOOI lan 5 g K SLNdNI INPUTS N PV UNGROUNDED SS SS m ss ele e e e e e e e e e e e e Y N q SS PVGROUND INPUTS EQUIPMENT GROUND S 0 Figure 2 3 Combiner Box Wiring SCCB 28 420 28 PV input fuse holders 15 Amp maximum fuse size 2 Wiring PV GROUNDED OUTPUT PV UNGROUNDED OUTPUT PV GROUND 2 Wiring Combiner Manual 0 PV GROUNDED PV GROUNDED INPUTS INPUTS PV GROUNDED OUTPUTS y n Ib elelelelelelelelel elelelelelelelelelelelelelelelele elelelelelelelelelele
9. a 240A DC fault current rating The SCCB 28 circuit combiner boxes has a 420A DC fault current rating The SCCB 52 circuit combiner boxes has a 416A DC fault current rating When temperature and voltage drop adjustments are considered the output conductor sizes can become quite large 500 mcm or greater and difficult to manage NEC 310 4 allows paralleling of conductors greater than 1 0 to achieve higher ampacities The SCCB 28 and 52 circuit combiner boxes provide output terminals for paralleling two conductors for the PV positive and negative as well as the equipment ground conductors Combiner Box Output Fusing If more than three combiner boxes are needed for one inverter it may be necessary to fuse the combiner box output conductors Please contact SMA America for further details Refer to Figures 2 1 through 2 4 for the terminal locations of the combiner circuits Combiner Manual 2 Wiring A ETL 3061752 1 PV GROUNDED OUTPUT PV GROUNDED INPUTS PV GROUNDED OUTPUT PV UNGROUNDED OUTPUT gt SLAdNI Ad PV UNGROUNDED OUTPUT WARNING Risk of Fire H PV GROUND EQUIPMENT Replace only INPUTS GROUND with the same type and aS 228000800 rating of fuse amp PV GROUND Figure 2 1 Combiner Box Wiring SBCB 6 90 6
10. lelelelelelelelelelelelelelele Ad INPUTS PVUNGROUNDED FF BH Y GROUND PV GROUND INPUTS INPUTS EQUIPMENT GROUND EQUIPMB GROUND po T GROUNDED OUTPUT Me n PV UNGROUNDED OUTPUT PV GROUND Figure 2 4 Combiner Box Wiring SCCB 52 416 52 PV input fuse holders 8 Amp maximum fuse size Combiner Manual 2 Wiring Fuse Sizing In any electrical system fuses are used to protect wiring and equipment from excessive currents that can cause damage heating or in extreme cases even fire If the fuse rating is too small it could open during normal operation If the fuse rating is too large it cannot provide the needed protection In PV systems the minimum and maximum size of the series fuse is determined by the electrical ratings of the PV module as well as by UL and National Electrical Code NEC requirements Be sure to consult with your PV module manufacturer for appropriate fuse ratings The minimum size of fuses and wiring are calculated using the Short Circuit Current Rating Isc of the PV module The NEC requires that all fuses and wiring be sized for a minimum of 1 56 times the Isc of the PV module used in the system The proper size PV string fuse is determined by calculating 1 56 x Isc of the PV module and then rounding up to the next standard fuse size
11. omissions typographical errors arithmetical errors or listing errors in the content material Revision History Rev No Date By Description Nov 1 2004 Preliminary Release Dec 1 2004 First Release Dec 10 2004 Torque Update Feb 09 2005 Revised Specifications Feb 2006 Update Jul 23 2007 Add Drawings for all 4 models July 17 2009 Address Change Septemper 9 2009 Warranty Change SMA America Incorporated 4031 Alvis Court Rocklin California 95677 Tel 1 916 625 0870 Fax 1 916 625 0871 www SMA America com iii Combiner Manual IMPORTANT SAFETY INSTRUCTIONS SAVE THESE INSTRUCTIONS This manual contains important instructions for the Combiner Box models SBCB 6 90 SCCB 12 240 SCCB 28 420 and SCCB 52 416 that must be followed during the installation and use of the Combiner Boxes The Combiner Boxes are designed and tested according to international safety requirements but as with all electrical and electronic equipment certain precautions must be observed when installing the Combiner Boxes To reduce the risk of personal injury and to ensure the safe installation and operation of the Combiner Boxes you must carefully read and follow all instructions and warnings in this Installation Guide Safety and Hazard Symbols This symbol is used to call attention to important information that you must have when installing and or operating the Combiner Boxes Failure to read and follow instruc
12. tions marked with this symbol could result in serious injury and or damage to the equipment This symbol appears beside instructions and warnings that deal with dangerous voltages that can injure people who come in contact with them Warnings WARNING A Warning describes a hazard to equipment or personnel It calls attention to a procedure or practice which if not correctly performed or adhered to could result in damage to or destruction of part or all ofthe SMA equipment and or other equipment connected to the SMA equipment or personal injury Warnings may also be accompanied by one or more of the safety and hazard symbols described above to indicate the type of hazard described therein Other Symbols In addition to the safety and hazard symbols described previously the following symbol is also used in this Installation Guide This symbol accompanies notes that call attention to supplementary information that gt you should know to ensure optimal operation of the system Combiner Manual Warranty All Combiner Boxes sold in the USA have a five year warranty For warranty coverage or if you have questions about the Combiner Box warranty contact SMA America at the address telephone number or Web site listed on page 11 to send E mail see the Contact section of the SMA America Web site www sma america com WARNING All electrical installation must be done in accordance with the National Electrical Code ANSI NFPA 70 local
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