Spacing between terminations

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sbutler

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Where in the code is the spacing distance between terminals located? I have 15kV terminations in a substation with no insulation or boots. I know there are minimal distances between the terminals themselves and the side or back of the cabinet.

Any replies will be greatly appreciated.
 
Might be in the NESC rather than NEC -110.34 was pretty vague about any spacing.
 
sbutler said:
Where in the code is the spacing distance between terminals located? I have 15kV terminations in a substation with no insulation or boots. I know there are minimal distances between the terminals themselves and the side or back of the cabinet..
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Well, there is 490.24 and T490.24 (2008. But that isn't exactly what you are asking. These cover field fabricated installations. 490.24 specifically does, "... not apply to equipment design, manufactured, and tested in accordance with accepted national standards."

Maybe what you are looking for is in the applicble national standard - ANSI, IEEE, UL, ... Take a look at the equipment nameplate and see if there is a standard listed.

ice
 
sbutler said:
I have 15kV terminations in a substation with no insulation or boots.
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At 15kV uninsulated bus and no boots are probably the most standard construction methods.

I cannot remember the L-G distance but it is around 5" in enclosed equipment.
 
NEC is not very specific for over 600V, very few references. Because most 600V is handled by POCOS which have their own rules and don't need city inspections. I would check the manufacturer rating but top of my head for 15KV I would say least 4" without boots/insulation

sbutler said:
Where in the code is the spacing distance between terminals located? I have 15kV terminations in a substation with no insulation or boots. I know there are minimal distances between the terminals themselves and the side or back of the cabinet.

Any replies will be greatly appreciated.
Click to expand...
 
NESC has the Answer

NESC has the Answer

The answer is 6" in the 2002 NESC (I don't have a current version). The clearances are located in Table 341-1
 
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