Slash rating

The slash rating, under the United States National Electrical Code, is given to circuit interrupt hardware and specifies a maximum line-to-ground voltage rating in combination with a maximum line-to-line voltage rating.

One common application would be for a three-phase electrical loads.

For example a 120/240 V rating can disqualify a circuit breaker for use with a delta system load that would otherwise work with a wye system load.

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