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210.12 Arc-Fault Circuit-Interrupter Protection.

(A) Definition: Arc-Fault Circuit Interrupter (AFCI).

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 deenergize

the circuit when an arc fault is detected. [ROP

2–119]

(B) Dwelling Units. All 120-volt, single phase, 15- and

20-ampere branch circuits installed in dwelling units shall

be protected by a listed arc-fault circuit interrupter, combination

type installed to provide protection of the branch

circuit. [ROP 2–105, 2–142, 2–111]

FPN No. 1: For information on types of arc-fault circuit

interrupters, see UL 1699-1999, Standard for Arc-Fault

Circuit Interrupters.

FPN No. 2: See 11.6.3(5) of NFPA 72®-2007, National

Fire Alarm Code® for information related to secondary

power supply requirements for smoke alarms installed in

dwelling units. [ROP 2–118a]

FPN No. 3: See 760.41 and 760.121 for power supply

requirements for fire alarm systems. [ROP 2–143]

Exception: The location of the arc-fault circuit interrupter

shall be permitted to be at other than the origination of the

branch circuit where the arc-fault circuit interrupter is installed

within 1.8 m (6 ft) of the branch circuit overcurrent

device as measured along the branch circuit conductors.

[ROP 2–147, 2–137]

Joe Tedesco, NEC Consultant

www.joetedesco.org