220.55 Note 4 and taps

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dm9289

Industrial Maintenance Electrician
Location
Pennsylvania
Occupation
Industrial process repair/ maintenance Electrician
From what I am seeing it appears you can run a 50 amp branch circuit if you have 2 cooking units of say 27 amps and 20 amps. You can tap off the 50 amp circuit and run smaller size wires not below #12 to each piece of equipment.
I understand if there is a direct gnd fault or short on either cooking unit the 50 amp breaker in panel would trip, but if you have an overload in one of the cooking units would there be a risk of fire hazard example 20 amp unit drawing 35 amps?
I don't get how this is OK im likely misunderstanding something
 

Dennis Alwon

Moderator
Staff member
Location
Chapel Hill, NC
Occupation
Retired Electrical Contractor
You cannot run smaller wires as I understand it. You can use the metal flex cables that comes with the cooktop and the oven. Remember the cooktop and oven is no different than a standard range except they are 2 separate units. The tap is from a junction box that is close to each unit. I believe you can install a junction and run 8/3 to each unit and then the conductors from each unit would connect to the 8/3 on a 40 amp circuit.
 

dm9289

Industrial Maintenance Electrician
Location
Pennsylvania
Occupation
Industrial process repair/ maintenance Electrician
You cannot run smaller wires as I understand it. You can use the metal flex cables that comes with the cooktop and the oven. Remember the cooktop and oven is no different than a standard range except they are 2 separate units. The tap is from a junction box that is close to each unit. I believe you can install a junction and run 8/3 to each unit and then the conductors from each unit would connect to the 8/3 on a 40 amp circuit.
Look at 220.19(A)(3)exception #1
This is from 2017 NEC handbook 210.19
 

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