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Circuit Requirements


Maximum Voltage


Maximum Photovoltaic System Voltage. In a dc photovoltaic 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 multicrystalline 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 manufacture's instructions.

Table 690.7 Voltage Correction Factors for Crystalline and Multicrystalline Silicon Modules
Ambient Temperature (°C)Correction Factors for Ambient Temperatures Below 25°C (77°F)(Multiply the rated open-circuit voltage by the appropriate correction factor shown below.)Ambient Temperature (°F)
25 to 101.0677 to 50
9 to 01.1049 to 32
-1 to -101.1331 to 14
-11 to -201.1713 to -4
-21 to -401.25-5 to -40


Direct-Current Utilization Circuits. The voltage of dc utilization circuits shall conform with 210.6.

Photovoltaic Source and Output Circuits. In one and two-family dwellings, photovoltaic source circuits and photovoltaic output circuits that do not include lamp holders, fixtures, or receptacles shall be permitted to have a maximum photovoltaic system voltage up to 600 volts. Other installations with a maximum photovoltaic system voltage over 600 volts shall comply with Article 690, Part I.

Circuits Over 150 Volts to Ground. In one and two-family dwellings, live parts in photovoltaic source circuits and photovoltaic output circuits over 150 volts to ground shall not be accessible to other than qualified persons while energized.

Bipolar Source and Output Circuits. For 2-wire circuits connected to bipolar systems, the maximum system voltage shall be the highest voltage between the conductors of the 2-wire circuit if all of the following conditions apply:
  1. One conductor of each circuit is solidly grounded.

  2. Each circuit is connected to a separate subarray.

  3. The equipment is clearly marked with a label as follows:
    WARNING
    BIPOLAR PHOTOVOLTAIC ARRAY.
    DISCONNECTION OF NEUTRAL OR
    GROUNDED CONDUCTORS MAY RESULT
    IN OVERVOLTAGE ON ARRY OR INVERTER.


    4. North American Electrical Code Introduction
    PV Systems - General Information 690.1 - 690.3
    PV Systems - General Information (1 of 2) 690.1 - 690.3
    PV Systems - General Information (2 of 2) 690.1 - 690.3
    PV Systems - Circuit Requirements 690.7
    PV Systems - Circuit Sizing and Current 690.8
    PV Systems - Overcurrent Protection 690.9
    PV Systems - Stand-Alone Systems 690.10
    PV Systems - Disconnecting Means 690.13 - 690.18
    PV Systems - Wiring Methods 690.31 - 690.35
    		PV Systems - Grounding 690.41 - 690.49
    PV Systems - Marking 690.51 - 690.56
    PV Systems - Connections to Other Sources 690.60 - 690.64
    PV Systems - Storage Batteries 690.71 - 690.74
    PV Systems - Systems Over 600 Volts 690.80 - 690.85
    Storage Batteries - General 480.1 - 480.4
    Storage Batteries - Installation 480.8 - 480.10
 

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P. 303-800-4725 F. 303-600-9726
Mail to: 138 5023 West 120th Ave. Broomfield, CO 80020
Denver Warehouse: 525 East 70th Ave. Denver, CO 80229
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