Electrical · S-P6JKW

Panelboard with SPD Mounting

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Surge protective device enclosures are mounted as close to the surge protective device feed breaker as possible with phase wire lengths limited to twenty-four inches and a maximum of one hundred eighty degrees of bends. Conduit between the electrical panel and the surge protective device must be straight and not exceed twelve inches in length while being completely sealed against fire, soot, and smoke intrusion into switchboards or panelboards. Conductors between each surge protective device circuit breaker and the corresponding device are sized to the largest conductor accepted by either the device or circuit breaker, with ground conductors parity sized to the phase conductors.

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