EV chargers, Article 220.83, Article 310.12, another residential idiot arguing with the AHJ!

[jaggedben]

Right. Because it's a continuous load? Or for some other reason?

 

[Birken Vogt]

Because you must always add 25% to the load calc for the "largest motor", if it is the branch circuit that feeds only that motor or if it is the whole house, that 25% always gets added. But only one time for the 1 larges motor covered by whatever service/feeder/branch is under consideration.

I suspect it is for better motor starting, not a continuous load thing.

Clarifying adding %25 for largest motor in single and multifamily units

Hi Can anyone clarify for me when do I have to add the +%25 for the largest motor in single and multifamily load calculations? I have read about it and saw many examples online but sometimes I saw that it should be calculated as name plate and sometimes +%25. Thank you please see bellow When...

forums.mikeholt.com

 

[jaggedben]

...
I suspect it is for better motor starting, not a continuous load thing.
..

That makes not much sense to me. But the requirement seems very similar to 430.22.

Seems like none of us actually know.