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20.20.027 Exception No. 1: A disconnecting means located on the do side shall be permitted to have an interrupt- ing rating less than the current- carrying rating where the system is designed so that the do switch cannot be opened under load. Exception No. 2: A connector shall be permitted to be used as an ac or a do disconnecting means provided that it complies with the requirements of 690.33 and is listed and identified for the use. 690.18 Installation and Service of an Array. Open circuiting, short-circuiting, or opaque covering shall be used to disable an array or portions of an array for installation and service. FPN: Photovoltaic modules are energized while exposed to light. Installation, replacement, or ser- vicing of array components while a module(s) is irradiated may expose persons to electric shock. IV. Wiring Methods 690.31 Methods Permitted. (A) Wiring Systems. All raceway and cable wiring methods included in this Code and other wiring systems and fittings specifically intended and identified for use on photovoltaic arrays shall be permitted. Where wiring devices with integral enclo- sures are used, sufficient length of cable shall be provided to facilitate replacement. (B) Single Conductor Cable. Types SE, UF, USE, and USE-2 single-con- ductor cable shall be permitted in photovoltaic source circuits where installed in the same manner as a Type OF multi-conductor cable in accordance with Article 339. Where exposed to sunlight, Type OF cable identified as sunlight-resistant shall be used. (C) Flexible Cords and Cables. Flexi- ble cords and cables, where used to connect the moving parts of tracking PV modules, shall comply with Arti- cle 400 and shall be of a type identi- fied as a hard service cord or porta- ble power cable; they shall be suit- able for extra-hard usage, listed for outdoor use, water resistant, and sunlight resistant. Allowable ampacities shall be in accordance with 400.5. For ambient temperatures exceeding 30°C (86°F), the ampacities shall be derated by the appropriate factors given in Table 690.31(C). (D) Small-Conductor Cables. Single- conductor cables listed for outdoor use that are sunlight resistant and moisture resistant in sizes 16 AWG and 18 AWG shall be permitted for module interconnections where such cables meet the ampacity require- ments of 690.8. Section 310.15 shall be used to determine the cable ampacity and temperature derating factors. 690.32 Comyonent Interconnections. Fittings and connectors that are in- tended to be concealed at the time of (Pleasanton April 2003) 710-24