also be applied by the installer in a visible location at the batteries.
690.6 Alternating-Current (ac) Modules.
(A) Photovoltaic Source Circuits. The requirements of Article 690 pertaining to photovoltaic source circuits shall not apply to ac modules. The photovoltaic source circuit, conductors, and inverters shall be considered as internal wiring of an ac module.
(B) Inverter Output Circuit. The output of an ac module shall be considered an inverter output circuit.
(C) Disconnecting Means. A single disconnecting means, in accordance with 690.15 and 690.17, shall be permitted for the combined ac output of one or more ac modules. Additionally, each ac module in a multiple ac module system shall be provided with a connector, bolted, or terminal-type disconnecting means.
(D) Ground-Fault Detection. Alternating-current module systems shall be permitted to use a single detection device to detect only ac ground faults and to disable the array by removing ac power to the ac module(s).
(E) Overcurrent Protection. The output circuits of ac modules shall be permitted to have overcurrent protection and conductor sizing in accordance with
240.5(B)(2).
II. Circuit Requirements
690.7 Maximum Voltage.
(A) Maximum Photovoltaic System Voltage. In a dc pho- tovoltaic source circuit or output circuit, the maximum
photovoltaic system voltage for that circuit shall be calculated 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 multic-rystalline 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, overcurrent devices, and other equipment. Where the lowest expected ambient temperature is below -40°C (-40°F), or where other than crystalline or multicrystalline silicon photovoltaic modules are used, the system voltage adjustment shall be made in accordance with the manufacturer's instructions.
When open-circuit voltage temperature coefficients are supplied in the instructions for listed PV modules, they shall be used to calculate the maximum photovoltaic system voltage as required by 110.3(B) instead of using Table 690.7.
Table 690.7 Voltage Correction Factors for Crystalline and Multicrystalline Silicon Modules
Correction Factors for Ambient Temperatures Below 25°C (77°F). (Multiply the rated open circuit voltage by the appropriate correction factor shown below.)
Ambient Ambient
Temperature (°C) Factor Temperature (°F)
24 to 20 1.02 76 to 68
19 to 15 1.04 67 to 59
14 to 10 1.06 58 to 50
9 to 5 1.08 49 to 41
4 toO 1.10 40 to 32
-1 to -5 1.12 31 to 23
-6 to -10 1.14 22 to 14
-11 to -15 1.16 13 to 5
-16 to-20 1.18 4 to-4
-21 to-25 1.20 -5 to -13
-26 to -30 1.21 -14 to -22
-31 to-35 1.23 -23 to-31
-36 to -40 1.25 -32 to -40
(B) Direct-Current Utilization Circuits. The voltage of dc utilization circuits shall conform to 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 landholders, fixtures, or receptacles shall be permitted to have a maximum photovoltaic system voltage up to
600