National Electrical Installation Standards

Standards as High as Your Own

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Wednesday, June 8, 2022

Question:

I read the Code Question of the Day each morning as I start the day. Interesting forum here in that you never know what is going to be asked, or how it might be answered, although, usually pretty accurate, I must say. Our question is related to power distribution blocks installed in a wire-way. Is working space (in accordance with NEC 110.26) required in front of the wire-way?

Thanks for the insights.

Will Parker

A

Answer:

Hello Will,

Thanks for the kind remarks. It's a challenge keeping up with the backlog of questions. We try to get to them all eventually. The answer to your question rests in the text of Section 110.26(A) which indicates that working space for equipment operating at 1000 volts, nominal, or less to ground and likely to require examination, adjustment, servicing, or maintenance while energized shall comply with the dimensions of 110.26(A)(1), (A)(2), (A)(3), and (A)(4) or as required or permitted elsewhere in this Code. The key in applying this section is the determination of whether or not this equipment is likely to require examination, adjustment, servicing, or maintenance while energized. Usually, this type of equipment is de-energized when work is performed. Most jurisdictions would not apply the working space requirements to a wire-way or junction box with a power distribution block, but it is the call of the AHJ.

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