Spacing For Copper Busbars

[master_rodher]

engineers,

what is the minimum spacing for copper busbar assembly

where in NEC can i find it?

thanks

 

[cpal]

Spacing from what??

Other bussor metal parts???
try 408.56

 

[nvpowerdoc]

Assuming you are talking about 480V assembly in switchgear, the recent manufacturer I worked for used insulated standoffs that were about 1" thick. The nominal clearance in air we used between uninsulated bus bar and a ground plane was 1" at 480V. When this clearance was not achievable, we would use a phenolic insulating material or insulating fiberboard such as Tufnol.

See page 26, product on center of page on the following link.
http://www.bowitt.com/insulating-parts/Bo-Witt_Catalog.pdf/