Sizing Equipment Grounding Conductors for Motor Circuits

May 28, 2014
Section 250.122 of the 2011 NEC spells out the requirements for sizing equipment grounding conductors.

Equipment grounding conductors for motor branch circuits shall be sized in accordance with Table 250.122, based on the rating of the _____ device.

a) motor overload
b) motor over-temperature
c) branch circuit short-circuit and ground-fault protective
d) feeder overcurrent protection

See answer and applicable Code reference

The correct answer is: c) branch circuit short-circuit and ground-fault protective

Section 250.122 of the 2011 NEC spells out the requirements for sizing equipment grounding conductors. Equipment grounding conductors for motor circuits shall be sized in accordance with 250.122(D)(1) or (D)(2). As noted in 250.122(D)(1), "The equipment grounding conductor size shall not be smaller than determined by 250.122(A) based on the rating of the branch-circuit short-circuit and ground fault protective device."

Voice your opinion!

To join the conversation, and become an exclusive member of EC&M, create an account today!

Sponsored Recommendations

Electrical Conduit Comparison Chart

CHAMPION FIBERGLASS electrical conduit is a lightweight, durable option that provides lasting savings when compared to other materials. Compare electrical conduit types including...

Fiberglass Electrical Conduit Chemical Resistance Chart

This information is provided solely as a guide since it is impossible to anticipate all individual site conditions. For specific applications which are not covered in this guide...

Considerations for Direct Burial Conduit

Installation type plays a key role in the type of conduit selected for electrical systems in industrial construction projects. Above ground, below ground, direct buried, encased...

How to Calculate Labor Costs

Most important to accurately estimating labor costs is knowing the approximate hours required for project completion. Learn how to calculate electrical labor cost.