eric williamson
Member
- Location
- South Carolina
I have a dead front switch gear -3000A 208v 3phase. It is completely enclosed. what is the minimum clearence in front of this gear?
switchboard clearence
- Thread starter eric williamson
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- Location
- Lockport, IL
- Occupation
- Semi-Retired Electrical Engineer
Re: switchboard clearence
That depends on what is in front of it (or what would be behind you, as you stood in front looking at it). It also depends on whether it is likely to ?require examination, adjustment, servicing, or maintenance while energized.? I believe that the phrase ?dead front? does not mean that there is no energized bare metal that you can get to from the front, but rather that there is no energized bare metal that you can get to from the front with the doors closed. Perhaps I?m wrong on that point. But the answer lies in NEC 110.26, and the most frequent answer would be three and one half feet.
That depends on what is in front of it (or what would be behind you, as you stood in front looking at it). It also depends on whether it is likely to ?require examination, adjustment, servicing, or maintenance while energized.? I believe that the phrase ?dead front? does not mean that there is no energized bare metal that you can get to from the front, but rather that there is no energized bare metal that you can get to from the front with the doors closed. Perhaps I?m wrong on that point. But the answer lies in NEC 110.26, and the most frequent answer would be three and one half feet.
ryan_618
Senior Member
- Location
- Salt Lake City, Utah
Re: switchboard clearence
36".
42" and 48" apply only to 480volt equipment.
EDIT: To more technicaly acurate, 42" and 48" only apply to equipment exceeding 150V to ground.
[ November 11, 2003, 05:46 PM: Message edited by: ryan_618 ]
36".
42" and 48" apply only to 480volt equipment.
EDIT: To more technicaly acurate, 42" and 48" only apply to equipment exceeding 150V to ground.
[ November 11, 2003, 05:46 PM: Message edited by: ryan_618 ]
- Location
- Lockport, IL
- Occupation
- Semi-Retired Electrical Engineer
Re: switchboard clearence
The most frequent situation that I routinely encounter would be 42" for a 480V system. But Ryan is right, and I stand corrected. For your situation, 36" is the minimum.
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