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NOTE: This is an unformatted excerpt from our online fire protection training library.

Load Calculations

Branch Circuit Load Calculations

Luminaire Requirements

For specific luminaires that are used for other than general lighting (such as signs or show windows), specific requirements are given in Section 220.14, Subsections (C), (D), (E), (F) and (G) for the specific types of outlets.

For motors, the value used is the same as the minimum conductor sized calculated in Article 430 or 440.

For sign and outline lighting, the minimum load requirement is 1200 VA, but in fact the sign may be much larger, in which case the actual load would be used. The load for a show window is calculated based on the size of the window.

One of the things that's particularly significant in these rules is the instruction to use the maximum VA rating of the equipment and lamps for which a luminaire is rated. This accounts not just for the lamp originally installed or intended, but for the possibility that the maximum rating lamp will be used as a replacement. It also accounts for the load of a luminaire that includes a ballast for discharge lighting. The use of VA in the calculation makes consideration of power factor unnecessary for the purpose of selecting adequately rated conductors and overcurrent devices.

NOTE: This is an unformatted excerpt from our online fire protection training library.

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