To limit the excess voltage to ground, which might occur from lightning or exposure to other higher voltage sources.
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The enclosures must be of an approved type for the location and must be mounted with an least a 1/4-inch air space between the wall or supporting surface.
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Service fuses, meters, high-impedance shunt circuits, supply conductors for time switches, surge-protection capacitors, instrument transformers, lightning arresters, and circuits for emergency systems
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Sunday, April 27, 2008
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