Spacing of DC Shunts at 400VDC

[JohnnyRingo]

I'm currently designing the layout of a DC Shunt panel,
can anyone tell me what the minimum gap should be between the exposed copper at 400VDC? or is there a chart somewhere that can tell me...

Cheers

 

[buzzp]

I do not recall the exact numbers but the spacing can be relatively small unless your in some environment with high humidity (condensing) and/or high altitude. A couple of inches is more than enough. Sorry I can't point you in the direction of some printed table but my recollection is from UL508 (industrial control equipment). If it is limited energy you can likely get a lot closer. Call UL and ask them what they use. I am fairly sure you can get a lot closer than 2". Good luck.

 

[jbartos]

Suggestion: Visit

http://www.harkis.harting.com/WebHelp/EHan/WebHelp/GBHANKriechstrecken.htm

etc. for details

 

[busbar]

Lacking a more specific reference, something conservative like 99NEC374-7 may do. Bare conductors shall be securely and rigidly supported so that the minimum clearance between bare current-carrying metal parts of different potential mounted on the same surface will not be less than 2 in. (50.8 mm), nor less than 1 in. (25.4 mm) for parts that are held free in the air. A clearance not less than 1 in. (25.4 mm) shall be secured between bare current-carrying metal parts and any metal surface. Adequate provisions shall be made for the expansion and contraction of busbars.

 

[JohnnyRingo]

cheers lads, thats helped alot.