Feed-thru Lugs

[krista]

If Panel B is fed through the lugs of Panel A, does the load from Panel B have to be included in the load from Panel A?

Thank you!
~KMT

 

[Guest]

Re: Feed-thru Lugs

Panel B is then a subfeed from Pnl A.Subfeed is a load and yes must be included as load on A

 

[jim dungar]

Re: Feed-thru Lugs

Terms like sub-feed and thru-feed are not universally defined in our industry.

I have always used these definitions (wish I could post drawings):

In a main lug panel;
Thru-feed means the second panel is fed off of the bussing of the first panel - the first panel needs to include the load of the second panel.
Sub-feed means the second panel is fed off of the lugs of the first panel - the first panel does not need to include the load of the second panel however the feeder does.

In a main breaker panel;
Thru-feed means the second panel is fed off of the bussing of the first panel after the branch breakers - the first panel needs to include the load of the second panel.
Sub-feed means the second panel is fed off of the bussing of the first panel after the main but before the branchs - the first panel needs to include the load of the second panel

 

[steve66]

Re: Feed-thru Lugs

For Square D panels, see
Square D

Their subfeed lugs wouldn't affect the first panel rating, but the feed through lugs would.

Steve

 

[pierre]

Re: Feed-thru Lugs

Steve
That is a very good link, thanks

Pierre