ORD 1869 - Laserfiche WebLink

690.7 Maximum Voltage. (A) Maximum Photovoltaic System Voltage. In a do pho- tovoltaic source circuit or output circuit, the maximum pho- tovoltaic system voltage for that circuit shall be computed as the sum of the rated open-circuit voltage of the series connected photovoltaic modules corrected for the lowest expected ambient temperature. For crystalline and multi- crystalline silicon modules, the rated open-circuit voltage shall be multiplied by the correction factor provided in Table 690.7. This voltage shall be used to determine the voltage rating of cables, disconnects, over current devices, and other equipment. Where the lowest expected ambient temperature is below -40°C (-40°F), or where other than crystalline or multi-crystalline silicon photovoltaic modules are used, the system voltage adjustment shall be made in accordance with the manufacturer's instructions. Table 690.7 Voltage Correction Factors for Crystalline and Multi- crystalline Silicon Modules Correction Factors for Ambient Temperatures Below 25°C (77°F) (Multiply the rated open-circuit voltage by the appropriate Ambient correction factor shown Ambient Temperature below.) Temperature (°C) (°F) 25 to 10 1.06 77 to 50 9to0 1.10 49to32 -1 to-10 1.13 31 to 14 -11 to -20 1.17 13 to -4 -21 to -40 1.25 -5 to -40 (B) Direct-Current Utilization Circuits. The voltage of do utilization circuits shall conform with 210.6. (C) Photovoltaic Source and Output Circuits. In one and two-family dwellings, photovoltaic source circuits and photovoltaic output circuits that do not include lamphold- ers, fixtures, or receptacles shall be permitted to have a maximum system voltage up to 600 volts. Other installa- 68