faults shall be protected by fuses or circuit breakers with ratings or settings in accordance with 430.52 or by a motor short- circuit protector in accordance with 430.52.

Exception: Where approved for group installation and marked to indicate the maximum size of fuse or inverse time circuit breaker by which they must be protected, the overload devices shall be protected in accordance with this marking.

FPN: For instantaneous trip circuit breakers or motor short-circuit protectors, see 430.52.

430.42 Motors on General-Purpose Branch Circuits.

1-phase ac or

1-phase ac or

1-phase ac or

dc 2-wire, 1-phase ac or dc ungrounded

dc 2-wire, 1-phase ac or dc, one

conductor grounded

dc 3-wire, 1-phase ac or dc, grounded neutral conductor

1 in either conductor

1 in ungrounded conductor

1 in either ungrounded

Overload protection for motors used on general- purpose branch circuits as permitted in Article 210 shall be provided as specified in 430.42(A), (B), (C), or (D).

(A) Not over 1 Horsepower. One or more motors without individual overload protection shall be permitted to be connected to a general-purpose branch circuit only where the installation complies with the limiting conditions specified in 430.32(B) and 430.32(D) and 430.53(A)(1) and (A)(2).

1-phase ac Any 3-phase 1 in ungrounded

conductor

(B) Over 1 Horsepower. Motors of ratings larger than specified in 430.53(A) shall be permitted to be

2-phase ac 3-wire, 2-phase ac,

ungrounded

2-phase ac 3-wire, 2-phase ac, one conductor grounded

2-phase ac 4-wire, 2-phase ac, grounded or ungrounded

2-phase ac Grounded neutral or 5-wire, 2-phase ac, ungrounded

2, one in each

phase

2 in ungrounded conductors

2, one per phase in ungrounded con- ductors

2, one per phase in any ungrounded phase wire

connected to general-purpose branch circuits only where each motor is protected by overload protection selected to protect the motor as specified in 430.32. Both the controller and the motor overload device shall be approved for group installation with the short-circuit and ground-fault protective device selected in accordance with 430.53.

(C) Cord-and-Plug-Connected. Where a motor is con- nected to a branch circuit by means of an attachment plug and receptacle and individual overload protection is omitted as provided in 430.42(A), the rating of the

3-phase ac Any 3-phase 3, one in each phase*

*Exception: An overload unit in each phase shall not he required where overload protection is provided by other approved means.

number of ungrounded conductors to interrupt current flow to the motor.
attachment plug and receptacle shall not exceed 15 amperes at 125 volts or 250 volts. Where individual overload protection is required as provided in 430.42(B) for a motor or motor-operated appliance that is attached to the branch circuit through an attachment plug and receptacle, the overload device shall be an integral part of the motor or of the appliance. The rating of the attachment plug and receptacle shall determine the rating of the circuit to which the motor may be connected, as provided in Article 210.

(D) Time Delay. The branch-circuit short-circuit and ground-fault protective device protecting a circuit to which a motor or motor-operated appliance is connected shall have