Overcurrent protection of Appliances

[wyatt p]

Recently inspected a new house that had the following:One double oven rated 8.5kw and a combination gas cooktop/electric oven rated 4.8kw. These appliances where fed on a 50 amp branch circuit.All branch circuit conductors to each appliance are properly sized for 50 amps.
If Note 4 to table 220.19 and 210.19(3)exception 1 are applied to this scenario,does 422.11(e) apply? It would seem that using 220.19 note 4 and 210.19(3)exception 1 would allow the 4.8kw appliance to be protected at 50 amps. Also, would the combination gas cooktop/electric oven be considered a "counter mounted cooking unit"? Thank you for your thoughts.

 

[rb]

Re: Overcurrent protection of Appliances

Wyatt,

I think that 422-11(b) applies and the overcurrent protection is permitted to be 50 amps unless the appliance is marked otherwise.

 

[bphgravity]

Re: Overcurrent protection of Appliances

I think the 50-amp OCD is too big for these loads. 8.5 + 4.8 = 13.3kw. Note 1, 13 - 12 = 1kw = Column C, 8kw + 5% = 8.4kw / 240 = 35 amp. 210.19(A)(3) = 40 amp minimum. 422.11(E) doesn't apply, and is the gas/electric combo actually "counter mounted"? If not, it probably cannot be classified as one. Check the listing on it.