Disconnecting Hermetic Refrigerant Motor-Compressors

The rules for disconnecting hermetic refrigerant motor-compressors are noted in Section 440.12(A)(1) of the 2011 NEC.

April 22, 2014

A disconnecting means that serves a hermetic refrigerant motor-compressor shall have an ampere rating of at least ____% of the nameplate rated-load current or branch-circuit selection current, whichever is greater.

a) 80
b) 100
c) 115
d) 125

See answer and applicable Code reference

The correct answer is: c) 115

Air-conditioning and refrigeration requirements can be found in Art. 440 of the 2011 NEC. The rules for disconnecting hermetic refrigerant motor-compressors are noted in Part II of this Article. More specifically, as outlined in Sec. 440.12(A)(1), "The ampere rating shall be at least 115% of the nameplate rated-load current or branch-circuit selection current, whichever is greater."