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Confusion about wire size ampacity and codes

2K views 8 replies 5 participants last post by  RedAdobe 
#1 ·
I'm moving an electric stove from one house to another need to run new cable and breaker at it's destination

The 60 degree column says 8-3 limit is 40 amps

The 75 degree column says 8-3 (THW, THWN, SE, USE, XHHW) is 50 amps

The 90 degree column with specific cable says 8-3 is 55 amps

Is the best to use 6-3 with 50 amp?

Or if stove is 12kw or less can you get by with 40 amp feed and safely stay 8-3?

8-3 is a lot cheaper than 6-3 but I'm sure you know that
 
#6 ·
The manual on line says you can use a 40 or 50 amp power cord...that's all it says. the sum of the oven, broiler and all 4 burners if on at once would be 15,700 watts. 40 amps is 8800 watts. 50 amps is 11,000 watts
 
#8 ·
Table 220.55 of the NEC allows ranges 16 kw to be installed based on 9.6 kw. This is because of the diversity of the load. The oven is on a T-stat so it is on and off and the eyes are rarely, if ever, burning at full capacity at the same time.

If this was a cooktop then the load would be figured as the nameplate states but a range (oven &cooktop) is figured at 9.6 kw... 40 amps and #8 is all that is needed. Interestng to note that a 9kw range and a 16 kw range can both be wired with #8 and a 40 amp circuit.

It certainly won't hurt to run a #6 and use 50 amps.
 
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