Common use of Wiring and Cabling Clause in Contracts

Wiring and Cabling. 48. Wiring and cabling shall be in specific accordance with the provisions of the 2011 edition (or later as applicable) of NFPA 70 (the National Electrical Code). All outdoor wiring materials shall be wet- rated, flame retardant, sunlight-resistant and rated for continuous use at temperatures up to 90°C. All wiring shall be labeled by the manufacturer with the specific rating classification. 49. Source Wiring runs (wiring between modules and combiner boxes), combiner box home-runs to DC disconnects, and all other wiring runs between devices and major items of equipment, and all wiring runs between other system nodes (DC disconnects, inverters, AC disconnects, utility interconnection points, and monitoring system instruments and devices) shall be continuous. Intermediate splicing is forbidden. 50. The following specific wiring materials and rating classifications shall be used: a. Copper conductors shall be used throughout on the DC system. Aluminum conductors are not permissible for any DC conductor. b. While copper conductors are strongly preferred, aluminum conductors may be utilized for AC interconnection conductors provided that all of the following conditions apply: (i) The use of aluminum conductors does not result in an unacceptably high voltage drop in the AC system (acceptable voltage drop being less than 2% total between the inverter AC terminations and the point of interconnection to the existing electrical service). (ii) Every aluminum conductor termination is made by a medium-voltage certified master terminator (regardless of whether the termination is for medium voltage or low voltage). (iii) That provision is made for every aluminum conductor termination to be readily accessible for infra-red inspection, regardless of location, at any time (including during post-construction System maintenance and inspection). (iv) That every aluminum conductor termination is subjected to infra-red inspection at System Commissioning. c. Source Wiring (wiring from modules to combiner boxes) and String Wiring (wiring between modules) shall be rated with both USE-2 and RHW-2 classifications. All other DC and AC wiring operating at 600V or less ("Low Voltage Wiring") shall be rated with THWN-2 classification

Wiring and Cabling. 48. Wiring and cabling shall be in specific accordance with the provisions of the 2011 edition (or later as applicable) of NFPA 70 (the National Electrical Code). All outdoor wiring materials shall be wet- wet‐ rated, flame retardant, sunlight-resistant sunlight‐resistant and rated for continuous use at temperatures up to 90°C. All wiring shall be labeled by the manufacturer with the specific rating classification. 49. Source Wiring runs (wiring between modules and combiner boxes), combiner box home-runs home‐runs to DC disconnects, and all other wiring runs between devices and major items of equipment, and all wiring runs between other system nodes (DC disconnects, inverters, AC disconnects, utility interconnection points, and monitoring system instruments and devices) shall be continuous. Intermediate splicing is forbidden. 50. The following specific wiring materials and rating classifications shall be used: a. Copper conductors shall be used throughout on the DC system. Aluminum conductors are not permissible for any DC conductor. b. While copper conductors are strongly preferred, aluminum conductors may be utilized for AC interconnection conductors provided that all of the following conditions apply: (i) The use of aluminum conductors does not result in an unacceptably high voltage drop in the AC system (acceptable voltage drop being less than 2% total between the inverter AC terminations and the point of interconnection to the existing electrical service). (ii) Every aluminum conductor termination is made by a medium-voltage medium‐voltage certified master terminator (regardless of whether the termination is for medium voltage or low voltage). (iii) That provision is made for every aluminum conductor termination to be readily accessible for infra-red infra‐red inspection, regardless of location, at any time (including during post-construction post‐construction System maintenance and inspection). (iv) That every aluminum conductor termination is subjected to infra-red infra‐red inspection at System Commissioning. c. Source Wiring (wiring from modules to combiner boxes) and String Wiring (wiring between modules) shall be rated with both USE-2 USE‐2 and RHW-2 RHW‐2 classifications. All other DC and AC wiring operating at 600V or less ("Low Voltage Wiring") shall be rated with THWN-2 THWN‐2 classification