National Electrical Installation Standards

Standards as High as Your Own

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Thursday, December 15, 2016

Question:

We are removing a 4000 amp 120/208 volt 3 phase bus that runs horizontal in a ceiling, and installing 11 - 4" pvc pipes in the ground with parallel 500 mcm wires. These pipes are after the main service disconnect feeding a MCC. Do I need to pull a 500 mcm ground in each pipe to satisfy 250-122 (F)?

Mike

A

Answer:

Hey Mike thanks for your question. Yes, the equipment grounding conductors in each raceway need to be sized based on the overcurrent device protecting all of the parallel conductors as stated in 250.122(F). For a 4000 ampere overcurrent device a 500 kcmil copper equipment grounding conductor needs to be installed in each raceway as shown in Table 250.122.

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    ABOUT CQD: NECA’s Code Question of the Day (CQD) is a leading National Electrical Code® forum for NECA and the industry. The CQD generates a lively dialogue and relative practical and Code-based responses to an ever-increasing and interactive audience.

    IMPORTANT NOTICE: All answers are based on the latest edition of the National Electrical Code®, unless the question requests a response based on a specific edition. This correspondence is not a formal interpretation of the NEC®. Any responses expressed to the questions are opinions and do not necessarily represent the official position of NECA, NFPA, or any technical committee. In addition, this correspondence is neither intended, nor should it be relied upon, to provide professional consultation or services.

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