marginal park power on hot days
Well, our PD EMS started cutting power around 11am today due to undervoltage. I finally got it to stop by turning off the converter and the fridge circuit breakers and turning the AC from high to low....
Forum Discussion
valhalla360 wrote:You are correct it is not 50%.... because it is as low as 41%CA Traveler wrote:
Actually, the NEC code allows for derating factor and that is common. And the panels main CB would trip to provide protection from overloading and fire.
The answer is in the middle...yes, they do allow derating on the assumption that not every pedestal would be at peak power demand.
It's not a 50% derating.
Also, 30amps is a nominal rating for the outlet Your average air/con only pulls 10-12amps. Add in 3-5amps for fridge and other light loads, and the average rig is drawing less than 17amps, so if voltage is dropping significantly, that implies an inadequate electrical system.
See table 551.73
http://www.electrician2.com/tables/Table551_73.pdf
