I have a 1200A, 3 phase, 3W bus with the following breakers in the SLD; 100A, 100A, 75A, 50A, 100A, 100A. In addition, there is a 200A ATS, 300A Meter, 300A Generator. The new addition would be a 200A breaker. According to 705.12(b), I would need to upsize the busbar. The EE states that is incorrect, but will not explain how that is possible. Can someone explain?
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Busbar Size
- Thread starter NewElec
- Start date
wwhitney
Senior Member
- Location
- Berkeley, CA
- Occupation
- Retired
I think we'd need the full SLD to properly comment, can you post it or a link to it?
Cheers, Wayne
Cheers, Wayne
- Location
- Wisconsin
- Occupation
- PE (Retired) - Power Systems
General panelboard and switchboard bussing is rated based on heat rise. There is no way to determine the ampacity just by looking at the bussing or by knowing it's dimensions.
Custom switchboards and metering equipment may be built using bus bar density (amps/square inch).
Custom switchboards and metering equipment may be built using bus bar density (amps/square inch).
Last edited:
I think we'd need the full SLD to properly comment, can you post it or a link to it?
Cheers, Wayne