A local contractor has several Fostoria 15kW heaters that they use during the construction phase for temp heat in each structure (1 per structure).
We’ve told them that the size of the heater is way overkill for the size of the structure. Anyways, they must have gotten a deal on them because they have a number of them. Amongst our company we are having discussions about the size of the OCPD.
It’s obvious that it’s considered a continuous load so circuit size is based off 125% 210.19(A)(1). We set them up with #4awg SO cord. Our discussion is about the OCPD. The nameplate rating is stated as 62.5 amps, and in fact it pulls that amount of amps. One of our guys says that it should be protected by a 70 breaker (nameplate rating with next size up). Most of us think it should be an 80 amp breaker (62.5 x 125%=78 amps, next size up = 80 amps)?
I’m looking for a code reference for the branch circuit OCPD being 125% of load for continuous load for a branch circuit (as opposed to the feeder size)? I’m sure it’s right in front of me as I look at the 2020 code book but can’t find it.
Please help with reference…, thanks!
We’ve told them that the size of the heater is way overkill for the size of the structure. Anyways, they must have gotten a deal on them because they have a number of them. Amongst our company we are having discussions about the size of the OCPD.
It’s obvious that it’s considered a continuous load so circuit size is based off 125% 210.19(A)(1). We set them up with #4awg SO cord. Our discussion is about the OCPD. The nameplate rating is stated as 62.5 amps, and in fact it pulls that amount of amps. One of our guys says that it should be protected by a 70 breaker (nameplate rating with next size up). Most of us think it should be an 80 amp breaker (62.5 x 125%=78 amps, next size up = 80 amps)?
I’m looking for a code reference for the branch circuit OCPD being 125% of load for continuous load for a branch circuit (as opposed to the feeder size)? I’m sure it’s right in front of me as I look at the 2020 code book but can’t find it.
Please help with reference…, thanks!
