Safety Requirements for Wiring Systems and Connectors for Photovoltaic Systems. Final Report

摘要

Safety requirements for wiring systems and connections and for separable connectors for use in roof-mounted photovoltaic (PV) arrays are identified. These requirements were established by considering the environmental use-conditions applicable to PV arrays and the differences between integral-, direct-, standoff- and rack-mounted modules. The articles in the National Electrical Code (NEC) covering wiring systems are discussed to: (1) define the wiring systems, (2) identify the permitted uses and use-restrictions, (3) outline the advantages and disadvantages and (4) address the concerns regarding support, protection against mechanical damage and wet versus dry locations. An overall assessment is made of the advantages and disadvantages of each wiring system to arrive at candidate wiring systems that are best suited for use in PV arrays. For candidate wiring systems having use-restrictions that may prohibit their use, considerations are given that need to be addressed by any proposed revision to the National Electrical Code to permit acceptance by the inspection authorities. The various wiring termination methods that are permitted by the NEC are discussed and those which have features that are desirable for PV applications are identified. Performance and construction requirements for PV cable and for PV connectors are presented in separate outlines of proposed investigations of these products. (ERA citation 09:049608)