Uses - hdbk10920023

DOE-HDBK-1092-98

NEC Section 305-6

OSHA Section 29 CFR 1910.304(b)(1))

Figure 2-1. GFCI-protected circuits is one way of providing protection of personnel using electric hand tools

on construction sites or other locations.

A GFCI will not protect the user from line-to-line or line-to-neutral contact hazards. For example,

an employee is using a double insulated drill with a metal chuck and drill bit protected by a GFCI

device. If the employee drills into an energized conductor and contacts the metal chuck or drill bit,

the GFCI device will not trip (unless it is the circuit the GFCI device is connected to) as it will not

detect a current imbalance.

2.7.2 USES

The use of GFCI's in branch circuits for other than dwelling units is defined in NEC Section 210-8(b),

for feeders in NEC Section 215-9, and for temporary wiring in Section 305-6.

Ground-fault protection for personnel shall be provided for temporary wiring installations utilized

to supply temporary power to equipment used by personnel during construction, remodeling,

maintenance, repair or demolition activities.

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