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

General Requirements in the NEC

Field Equipment Markings

Available Fault Current

Section 110.24

Section 110.24 requires the marking of the available fault current. This fault current marking must:

indicate the date that the fault current calculation was performed, be durable enough to withstand whatever environment it is exposed to and
be revised to indicate the new levels, as modifications are made that affect the maximum available fault current.

The primary reason for this requirement is to facilitate enforcement of the requirements in Sections 110.9 and 110.10 to have interrupting ratings and short-circuit current ratings that are adequate for the fault current that is available.

This requirement applies only to service equipment in non-dwelling units, although the requirement for interrupting ratings applies to all installations under the NEC. The marking is not intended for or adequate for determining the level of arc flash hazard.

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

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