National Electrical Code Top Ten Tips: Article 422: Appliances
Please note, we do quote from copyrighted material. While the NFPA
does allow such quotes, it does so only for the purposes of education
regarding the National Electrical Code. This article is not a substitute
for the NEC.
These are the 10 NEC Article 422 items we deem most important, based
on the pervasiveness of confusion and the potential costs of same.
- An "appliance" has a specific definition, which you will find in
Article 100.
- Some appliances have a protective device rating on them. This is
not telling you how much current the appliance draws. It is telling
you the maximum breaker size for the circuit that supplies the
appliance. You can't exceed this. [422.11(A)]
- If there is no breaker marking on the appliance, a maximum may
still apply. Several types of appliances have maximums, as denoted
in 422.11(B) through (G).
- Central heating equipment, per Article 100, is also a type of
appliance. Any such equipment other than fixed space heating
equipment must be on its own branch circuit. There are a couple of
exceptions, but those essentially allow for very closely related
equipment. [422.12].
- When you are calculating total loads, consider the typical
residential water heater to be a continuous load. [422.13]
- The flexible cords of garbage disposals, dishwashers, trash
compactors, cooking units (wall-mounted or counter-mounted), and
range hoods have specific requirements. [422.16(B)]
- If you do any work in a room that has a DIY-installed ceiling
fan, beware! DIY people are notorious for code violations, and this
is one place they are likely to make them. One common problem is
improper mounting. The fan must be supported independently of a
standard outlet box, or it must be supported by a box identified for
the purpose and installed per 314.27(D). [422.18]
- Another common violation is the disconnect means for the garage
door opener. The opener is an appliance, and the motor is typically
1/2 hp. But any appliance with a motor more than 1/8 hp cannot use
the panel breaker as the disconnecting means. [422.31]
- Switches or circuit breakers used as a disconnecting means must
be of the indicating type. [422.35]
- Vending machines must have GFCI protection. [422.51]
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