FAQ

continued from page 81

on, or behind walls. Also, review 424.93(C) for similar

installation requirements.

Material taken from the National Electric Code

is reprinted with permission

from NFPA 70

, 2023 edition. National Electrical Code

NEC

Text

Revision

430.6(A) Sizing Conductors and

Switches for Motors

Change Summary

• The NEC has made a revision to clarify when to use

table values or nameplate when sizing conductors,

switches and other electrical apparatus for motors.

Article 430 – Motors, Motor Circuits and Controllers

430.6 Conductor Ampacity and Motor Rating

Determination.

(A) General Motor Applications.

(1) Table Values. Other than for motors built for low speeds

(less than 1200 RPM) or high torques, and for multispeed

motors, the values given in Table 430.247, Table 430.248,

Table 430.249, and Table 430.250 shall be used instead of

the actual current rating marked on the motor nameplate to

determine the following:

(1) Ampacity of conductors

(2) Current ratings of switches

(3) Current ratings of branch-circuit short-circuit and

ground-fault protection

Where a motor is marked in amperes, but not horsepower,

the horsepower rating shall be assumed to be that

corresponding to the value given in Table 430.247, Table

430.248, Table 430.249, and Table 430.250, interpolated

if necessary.

Exception No. 1: Multispeed motors shall be in accordance with 430.22(B)

and 430.52.

Exception No. 2: For equipment that employs a shaded-pole or permanent-

split capacitor-type fan or blower motor that is marked with the motor type,

424.38(B)(6)

Prohibits

heating

cables

behind

tubs and

showers

VIOLATION