Ground-Fault Circuit Interrupter
indicates that all 120-volt, single-phase,
15 and 20 ampere receptacle outlets on construction sites (not
including the permanent wiring of the structure), need to have
approved ground-fault circuit interrupters (GFCI) for personal
protection against electrocution.
Furthermore, this same section specifies that receptacles on a
portable or vehicle mounted generator under 5kW (5000 watts)
does not need built-in GFCI if the circuit conductors of the generator
are insulated from the frame and any other grounded surfaces.
If your portable generator is above 5kW, clarification of built in
GFCI should be labeled clearly on the generator’s control panel.
It is recommended that you do not attempt to install GFCI yourself
if the generator does not come equipped with built-in GFCI.
specifies grounding conditions and requirements
for portable and vehicle mounted generators. By definition,
a portable generator is considered a
separately derived system,
meaning it is an electrical source having no direct connection to circuit
conductors of any other electrical source.* (see source reference)
The portable generator frame may serve as the ground path for
the system it supplies. In order for this to be true, all
noncurrent-carrying metal parts of the generator need to be
bonded to the generator frame. Likewise, the neutral conductor
must be bonded to the generator frame as well.
The same requirements apply for vehicle-mounted generators
as well, the only difference being that the generator frame
must be bonded to the vehicle frame.