Residential range rated 15kw

[Little Bill]

Hey, I just said it's SAFER.
There's safe, safer and safest.

TX+MASTER#4544

If the conductors are sized for 50A, how is a 40A breaker safer? Any overload over 50A would trip the 50A breaker.

 

[infinity]

Hey, I just said it's SAFER.
There's safe, safer and safest.

I know you said safer but can you please explain why it's safer?

 

[TX+ MASTER#4544]

If the three are wall mounted ovens than No.
I think note 3 would apply if all wall mounted ovens.

If one is counter mounted and two are wall mounted. Yes, kinda. Need name plate info for sizing. So the 30 may to small for three.
If you treat them like one range.

Pretty sure the code is referring to a cooktop(counter mounted cooking unit) on the counter top surface and two wall mounted ovens.

Please let me know if I'm looking at this correctly. We have been discussing this topic at work. It all started with 40 amp breaker and conductor for a range on 50 amp receptacle.
The it took a turn from there to demands.

2023NEC TX
Section 220.55 and T.220.55 and note number 6.
Example: Consider 3 household cooking appliances; one 8 kW + one 6 kW+ one 5kW = 19 kW total kW
19 kW - 12 kW = 7 kW
For every kW over 12 kW, increase Column C by 5 percent for each kW
7 kW x 5 percent = 35% or 0.35%
Treat these 3 household appliances as one (equivalent to one range) found in Column C and Note 6
One 8 kW x 1.35 % = 10.8kW 10.8kW x 1,000 watts = 10,800 watts
10,800 watts / 240 volts = 45 amps use type NM (romex)
T.310.16 60 degree column select a 6 AWG copper at 55 amps.
T.240.6 (A) there's not a 55 amp rated OCPD, round down to a 50 amp OCPD.

If you're interested in the rest of this particular installation, I will share that with you later.
I'm going to watch Houston destroy the LA Chargers 'changers', sorry, Cali fans. Don't Mess with Texas.

TX+MASTER#4544