Greetings all whats your take on the minimum OCPD size for a 6kW 240V fixed electric patio heater?
2017 NEC 210.3 Sends me to 424.3 For branch circuit sizing.
424.3(B) States that its a continuous load so 6kW X 1.25 = 7.5kW
Or 25A X 1.25 = 31.25A
210.18 States the maximum permitted ampere rating of the overcurrent device determines the circuits size.
Since these are individual branch circuits the minimum circuit size = 35A, using 240.4(B) next size up.
So the smallest breaker one can use is a 35?
Thanks in advance
2017 NEC 210.3 Sends me to 424.3 For branch circuit sizing.
424.3(B) States that its a continuous load so 6kW X 1.25 = 7.5kW
Or 25A X 1.25 = 31.25A
210.18 States the maximum permitted ampere rating of the overcurrent device determines the circuits size.
Since these are individual branch circuits the minimum circuit size = 35A, using 240.4(B) next size up.
So the smallest breaker one can use is a 35?
Thanks in advance
I did worse as I did not even have the specs, just went off experience. I usually see 2kW 240V models assumed that was it fired off a bid for 20A 240V circuits. Fortunately my coworker the journeyman has a brain and a code handbook (not just the paper copy) he installed #8's and a 35A breaker, passed inspection done deal lesson learned. Probably lost 50 bucks on wire or something. It actually only came up because the customer contacted the manufacturer directly about a remote control kit and they mistakenly thought two heaters where on one circuit, (because we put in contactors and one switch).