Generator quetsions...
jscozz
11 years ago
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Finally installing a Kohler 20RESA standby generator. I have a couple code related questions before I submit my permit paperwork...
I have all loads that I want backed up on a separate subpanel already. 150A panel (mainly for the extra slots), but fed by a 100A breaker off main panel.
1) I am hearing different interpretations about how the loads in the subpanel, the ATS size and the generator size need to correlate to meet code. The Kohler 20RESA will do 75A on nat gas. The backup power subpanel is a 150A panel (30 slots), 150 main breaker, fed from main panel by 100A breaker. Max normal load over a week (I have power monitors on this panel) is about 7kw. If I turn everything on it approaches 12 kw. I have read there is some code requirement that the generator or xfer switch has to be able to handle ALL loaded in a subpanel? Is it just xfer switch? 20kw generator is realistically more than enough for me and what I want to run, knowing that most loads to not run simultaneously... does code dictate whether I use a 100A xfer switch or 200A switch? And whether I need load shedding devices on my major loads to keep total under 18kw IF all loads were on at once?
2) Is a ground rod always required at the generator? I assumed the equipment ground was not switched in the ATS... and that the generator was automatically tied to building equipment ground and the existing ground roads at my meter socket. I thought only stand alone generator installations (not tied to grid power or xfer switch) needed a ground rod... am I wrong?
Thanks for your help!
Ron Natalie
jscozzOriginal Author
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