Cut Sheet

Volume 1—Residential and Light Commercial CA08100002E—August 2015 www.eaton.com V1-T1-99
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1.5
Loadcenters and Circuit Breakers
Classified Circuit Breakers
Accessories
CHQ Breaker Accessories
Description
Catalog
Number
Breaker handle lock CHLO
Technical Data
Arc Fault Application Notes
An arc fault circuit interrupter
is a device intended to
provide protection from
the effects of arc faults by
recognizing characteristics
unique to arcing and by
functioning to de-energize
the circuit when the arc
fault is detected. As of
January 1, 2002, the
National Electrical Code
(NEC) requires all branch
circuits that supply 125 V,
single-phase, 15 and 20 A
receptacle outlets installed
in dwelling unit bedrooms
shall be protected by an arc
fault circuit interrupter(s).
This includes ceiling lighting
(recessed, ceiling fans, etc.)
as well as smoke detectors
and all other bedroom outlets.
The 2005 NEC introduced the
application of the
Combination Type AFCI for
bedroom circuits required as
of January 1, 2008. The 2008
NEC expands this application
to other living areas.
Ground Fault
Application Notes
Single-pole GFCBs are
designed for use in two-wire,
120 Vac circuits. Drawing
on Page V1-T1-100 shows a
typical wiring configuration.
Two-pole GFCBs are
designed for use in three-
wire, 120/240 Vac circuits,
120 Vac multiwire circuits
employing common, neutral
and two-wire, 240 Vac
circuits obtained from a
120/240 Vac source.
Drawings on Page V1-T1-100
illustrate typical wiring
configurations for
120/240 Vac multiwire
circuits.
Drawing on Page V1-T1-100
depicts a 240 Vac, two-wire
circuit. Note the “panel
neutral” conductor connects
to the neutral bar, even
though the neutral is not
included in the load circuit.
This connection is necessary
to supply a 120 Vac power
source to the ground fault
sensing circuit.
The figures are shown with
a 120/240 Vac, single-phase,
three-wire power source,
ut are also applicable to a
120/208 Vac, three-phase,
four-wire power supply.
For all figures, the electrical
operation of the GFCB
is not affected by the
equipment ground.