•
Components and devices with conductors damaged during installation.
•
Loose terminations and connections.
Correct deficiencies and test AFCIs in accordance with Section 5.
A2.2 Existing
Installations
For existing AFCIs that trip after devices and components are installed, check for improper
wiring and installation in accordance with Section A2.1. Keep in mind that AFCIs that are not
de-energized when devices and components are installed may trip during installation when
conductors inadvertently contact conductors of other circuits. Reset the AFCI and check that the
AFCI does not trip again. Always de-energize AFCIs when working on AFCI-protected circuits
and conductors.
A2.2 Troubleshooting AFCIs Using GFCIs
Consider temporarily replacing the AFCI with a GFCI to determine whether an AFCI is tripping
due to a ground-fault or arc-fault. If the GFCI does not trip, the AFCI was most likely tripping
due to an arc-fault. If the GFCI trips, the AFCI was most likely tripping due to a ground-fault.
Troubleshoot the fixed wiring and appliances in accordance with Section A3.
A3.
Troubleshooting Fixed Wiring and Appliances
WARNING: AFCIs are designed to protect against arc-faults because of the likelihood that the
arc-fault will ignite surrounding flammable materials. Immediately disconnect and discontinue
use of suspect equipment and appliances, and de-energize suspect conductors. Repair or replace
deficient appliance and conductors.
Troubleshooting fixed wiring and appliances after an AFCI or GFCI trips is a process of
elimination. If an AFCI or GFCI trips instantaneously when an appliance is plugged in or turned
on during troubleshooting, remove the appliance from the circuit and reset the device. If the
device does not trip, there is either a short-circuit, arc-fault, or ground-fault in the appliance or
the appliance cord. If the device trips, there may be a short-circuit, arc-fault, or ground-fault in
the fixed wiring.
Interview personnel who were present at the time the device tripped for information regarding
evidence of an arc-fault or ground-fault, such as arcing, sparking, odors, buzzing, hissing sounds,
or other evidence of electrical or thermal damage. Investigate wiring, appliances and equipment,
identify possible sources of arcing, and immediately disconnect suspect appliances and
equipment.
Ensure that the affected circuit, fixed wiring, and connected appliances and equipment are de-
energized. Unplug all cord-and-plug appliances, table lamps, and extension cords connected to
