its control cir- cuit is operated by a protective device that is not inte- gral with the current-interrupting device, it shall be arranged so that the opening of the control circuit will result in interruption of current to the motor- compressor.

(B) Protection of Motor-Compressor Control Apparatus and Branch-Circuit Conductors. The motor-compressor controllers), the disconnecting means, and the branch- circuit conductors shall be protected against over- current due to motor overload and failure to start by one of the following means, which shall be permitted to be the same device or system protecting the motor- compressor in accordance with 440.52(A):

Exception: Overload protection of motor-compressors and equipment on 15- and 20-ampere, single-phase, branch circuits shall be permitted to be in accordance with 440.54 and 440.55.

(1) An overload relay selected in accordance with

440.52(A)(1)

(2) A thermal protector applied in accordance with

440.52(A)(2), that will not permit a continuous
current in excess of 156 percent of the marked
rated-load current or branch-circuit selection
current

(3) A fuse or inverse time circuit breaker selected in accordance with 440.52(A)(3)

(4) A protective system, in accordance with

440.52(A)(4), that will not permit a continuous
current in excess of 156 percent of the marked
rated-load current or branch-circuit selection
current

440.53 Overload Relays. Overload relays and other de vices for motor overload protection that are not capable of opening short circuits shall be protected by fuses or inverse time circuit breakers with ratings or settings in accordance with Part III unless identified for group installation or for part-winding motors and marked to indicate the maximum size of fuse or inverse time circuit breaker by which they shall be protected.

Exception: The fuse or inverse time circuit breaker size marking shall be permitted on the nameplate of the equipment in which the overload relay or other overload device is used.

440.54 Motor-Compressors and Equipment on 15- or

20-Ampere Branch Circuits — Not Cord-and-

Attachment-Plug-Connected. Overload protection for

motor-compressors and equipment used on 15- or 20-
ampere 120-volt, or 15-ampere 208- or 240-volt single-
phase branch circuits as permitted in Article 210 shall
be
permitted as indicated in 440.54(A) and 440.54(B).

(A) Overload Protection. The motor-compressor shall be provided with overload protection selected as speci- fied in 440.52(A). Both the controller and motor over- load protective device shall be identified for installation with the short-circuit and ground-fault protective device for the branch circuit to which the equipment is connected.

(B) Time Delay. The short-circuit and ground-fault protective device protecting the branch circuit shall have sufficient time delay to permit the motor- compressor and other motors to start and accelerate their loads.

440.55 Cord-and-Attachment-Plug-Connected Motor- Compressors and Equipment on 15- or 20-Ampere Branch Circuits. Overload protection for motor- compressors and equipment that are cord-and- attachment-plug-connected and used on 15- or 20- ampere 120-volt, or 15-ampere 208- or 240-volt, single- phase branch circuits as permitted in Article 210 shall be permitted as indicated in 440.55(A), (B), and (C).

(A) Overload Protection. The motor-compressor shall be provided with overload protection as specified in

440.52(A). Both the controller and the motor overload