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Alwayslearningelec

Senior Member
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NJ
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Estimator
When calculating voltage drop, in this example 125A breaker feeding 125A MCB branch panel board would one enter 125A into the calculation or the actual load of the branch panel?

BTW would in the case of a branch panel and their loads there would be "connected" loads and "calculated" load, correct?
 
You would use the calculated load unless you anticipated more loads in the future then you might take that into consideration.
 
To calculate VD the actual load of the branch panel would be used instead of 125A. If there are "future loads" that you want to account for, you may want to add those in on top of the actual load. The conductor size that ends up being used should be the larger of the following:
  1. minimum conductor size required with ampacity that exceeds design load and meets voltage drop requirements
  2. minimum conductor size required to be protected by the branch panel OCPD
 
If this is for the temp trailers.
Use single phase.
I did a load sheet on what I saw.
For a previous post.

I'll pull the file and let you know what I used. If it would help.
 
infinity said:
You would use the calculated load unless you anticipated more loads in the future then you might take that into consideration.
Click to expand...
That’s a good point. What do there were spares in the panel and future loads were added that one wouldn’t know about at the time of the calculation? I guess 80% of main breaker rating is safe??
 
Tulsa Electrician said:
If this is for the temp trailers.
Use single phase.
I did a load sheet on what I saw.
For a previous post.

I'll pull the file and let you know what I used. If it would help.
Click to expand...
No it’s not . Another scenario. Oh yea right I did briefly see that..I meant to go back and look at that sheet ..I will now. Thanks
 
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