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Ground-fault circuit interrupters
The employer is required to provide approved ground-fault circuit interrupters
for all 120-volt, single-phase, 15- and 20-ampere receptacle outlets on
construction sites which are not a part of the permanent wiring of the building
or structure and which are in use by employees. Receptacles on the ends of
extension cords are not part of the permanent wiring and, therefore, must be
protected by GFCIs whether or not the extension cord is plugged into permanent
wiring. These GFCIs monitor the current-to-the-load for leakage to ground. When
this leakage exceeds 5 mA ± 1 mA, the GFCI interrupts the current. They are
rated to trip quickly enough to prevent electrocution. This protection is
required in addition to, not as a substitute for, the grounding requirements of
OSHA safety and health rules and regulations, 29 CFR 1926. The requirements
which employers must meet, if they choose the GFCI option, are stated in 29 CFR
1926.404(b)(1)(ii).
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