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Circuit Sizing and Current.



Calculation of Maximum Circuit Current. The maximum current for the specific circuit shall be calculated in accordance with 690.8(A)(1) through(A)(4).
  1. Photovoltaic Source Circuits Currents. The maximum current shall be the sum of parallel module rated short-circuit currents multiplied by 125 percent.

  2. Photovoltaic Output Circuit Currents. The maximum current shall be the sum of parallel source circuit maximum currents as calculated in 690.8(A)(1).

  3. Inverter Output Circuit Current. The maximum current shall be the inverter continuous output current rating.

  4. Stand-Alone Inverter Input Circuit Current. The maximum current shall be the stand-alone continuous inverter input current rating when the inverter is producing rated power at the lowest input voltage.


Ampacity and Overcurrent Device Rating. Photovoltaic system currents shall be considered to be continuous.

  1. Sizing of Conductors and Overcurrent Devices. The circuit conductors and overcurrent devices shall be sized to carry not less than 125 percent of the maximum currents as calculated in 690.8(A). The rating of setting of overcurrent devices shall be permitted in accordance with 240.4(B) and (C).

    Exception: Circuits containing assembly, together with its overcurrent device(s), that is listed for continuous operation at 100 percent of its rating shall be permitted to be utilized at 100 percent of its rating.

  2. Internal Current Limitation. Overcurrent protection for photovoltaic output circuits with devices that internally limit the current from the photovoltaic output circuit shall be permitted to be rated at less than the value calculated in 690.8(B)(1). This reduced rating shall be at least 125 percent of the limited current value. Photovoltaic output circuit conductors shall be sized in accordance with 690.8(B)(1).

    Exception: An overcurrent device in an assembly listed for continuous operation at 100 percent of its rating shall be permitted to be utilized at 100 percent of its rating.


Systems with Multiple Direct-Current Voltages. For a photovoltaic power source that has multiple output circuit voltages and employ6s a common-return conductor, the ampacity of the common-return conductor shall not be less than the sum of the ampere ratings of the overcurrent devices of the individual output circuits.

Sizing of Module Interconnection Conductors. Where a single overcurrent device is used to protect a set of two or more parallel-co0nnected module circuits, the ampacity of each of the module interconnection conductors shall not be less than the sum of the rating of the single fuse plus 125 percent of the short-circuit current from the otehr parallel-connected modules.

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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