Available Fault Current Label

A fault study must be done to identify the maximum amount of fault current available. That information and the date it was determined must be put on a label that is field applied to the equipment.

Short Circuit Fault Current Labeling Electric Arc

Knowing the available fault current and applying available fault current labels on new equipment is also now mandated by national electrical code nec.

Available fault current label. Available fault current is the maximum current in a short circuit. Service equipment in other than dwelling units shall be legibly marked in the field with the maximum available fault current. In this podcast we review the change in the nfpa 70 national electrical code 2011.

The nec 11024a states. Creating custom fault current labels. It simply states the maximum available fault current and the date it was calculated and is of sufficient durability to withstand the environment involved.

No exact location for placement of this label on the equipment is specified. This is because as machines are updated and improved the fault current calculations can change. An example of the text that may be used on a machine might be maximum available fault current 50500 amps.

Electrical service panels must be labeled with the current and the date it was calculated. Available fault current labeling get your free fault current label guide this guide is an essential resource for compliantly labeling 3 phase service equipment. If it changes the label needs to be replaced with the new calculation and date.

In many cases this information comes from the utility.

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