Available Fault Current Label
The nec 11024a states. No exact location for placement of this label on the equipment is specified.
Vertical Ansi Notice Electrical Label With Symbol 5x3 5 In Vinyl 4
It simply states the maximum available fault current and the date it was calculated and is of sufficient durability to withstand the environment involved.
Available fault current label. This is because as machines are updated and improved the fault current calculations can change. Available fault current is the maximum current in a short circuit. Available fault current labeling get your free fault current label guide this guide is an essential resource for compliantly labeling 3 phase service equipment.
An example of the text that may be used on a machine might be maximum available fault current 50500 amps. A fault study must be done to identify the maximum amount of fault current available. Creating custom fault current labels.
If it changes the label needs to be replaced with the new calculation and date. Knowing the available fault current and applying available fault current labels on new equipment is also now mandated by national electrical code nec. Service equipment in other than dwelling units shall be legibly marked in the field with the maximum available fault current.
That information and the date it was determined must be put on a label that is field applied to the equipment. Electrical service panels must be labeled with the current and the date it was calculated. In this podcast we review the change in the nfpa 70 national electrical code 2011.
In many cases this information comes from the utility.
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