JMill
Member
- Location
- Portland, OR
- Occupation
- Engineer
Existing condition is one oven off a 40 amp, 120/240 V dedicated circuit. We are looking to replace both the existing oven and also add a new 120/240 V speed oven as well. So the new wall ovens would be as follows:
"Speed Oven" - 120/240 V, 30 Amps (6.3 kw power rating at 240V)
"Convection Oven" - 120/240 V, 20 Amps (4.2 kw power rating at 240V)
I’m wanting to explore how to get this to work without requiring extensive electrical work assosciated with adding a new dedicated circuit and wiring between the panel and the ovens, which is only a 35-50 foot run but would require sheet rock work and have to be run exposed in the garage… Is there any reason I can't take both ovens off the existing oven branch circuit and just rewire from that existing circuit to include taps to both ovens? The current circuit is 2-pole 40 amp and is wired with 6 AWG wire labeled XHHW-2. I have plenty of available load on my circuit breaker to expand the 40 amp service to 50 amps and it appears the 6AWG XHHW-2 wire is rated to 55 amps in accordance with NEC Table 310.15(B)(16). The NEC seems to generally allow wiring multiple ovens off the same branch circuit as evidenced in 210.19(A)(3) Exception 1.
Alternatively, I am toying with the idea of utilizing the existing 6AWG XHHW-2 wiring to supply a new 50 amp sub panel where I can divide the 30 amp breaker and 20 amp breaker separately, but I'm not sure if there is anything to consider that I'm not already considering regarding this approach. The manufacturer installation instructions seem to prefer a dedicated circuit (although they use softer language like "should" rather than "shall" and seem to have some conflicting information regarding whether or not it needs to be on a dedicated circuit between the instalaltion instructions for the two different appliances). The main benefit of this approach would be to provide a dedicated circuit to each appliance, although I'm not sure if this is truly required or if there are practical or theoretical advantages to this approach worth the additional effort. I believe I have adequate space to add a sub-panel in an accessible location underneath the stairs which is directly adjacent to the backside of my ovens, but don't know if I'm missing any additional requirements I should be aware of.
Lastly, I'm not sure if the combination of Table 220.55 and 422.10(A) Paragraph 4 help provide any relief.
Here are links to the ovens intended for use if someone finds this useful:
Link to Standard Convection Oven: https://www.cafeappliances.com/appl...lt-In-Convection-Single-Wall-Oven-CTS90DP4NW2
Link to Speed Oven: https://www.cafeappliances.com/appl...en-with-240V-Advantium-Technology-CSB923P2NS1
Any help would be greatly appreciated as I've spent a tremendous amount of time trying to understand how to solve this issue and am having trouble getting an electrician to make a house call to provide recommendations. Ovens are ready for delivery and I'm wanting to have a gameplan for the electrical before accepting delivery of the items.
"Speed Oven" - 120/240 V, 30 Amps (6.3 kw power rating at 240V)
"Convection Oven" - 120/240 V, 20 Amps (4.2 kw power rating at 240V)
I’m wanting to explore how to get this to work without requiring extensive electrical work assosciated with adding a new dedicated circuit and wiring between the panel and the ovens, which is only a 35-50 foot run but would require sheet rock work and have to be run exposed in the garage… Is there any reason I can't take both ovens off the existing oven branch circuit and just rewire from that existing circuit to include taps to both ovens? The current circuit is 2-pole 40 amp and is wired with 6 AWG wire labeled XHHW-2. I have plenty of available load on my circuit breaker to expand the 40 amp service to 50 amps and it appears the 6AWG XHHW-2 wire is rated to 55 amps in accordance with NEC Table 310.15(B)(16). The NEC seems to generally allow wiring multiple ovens off the same branch circuit as evidenced in 210.19(A)(3) Exception 1.
Alternatively, I am toying with the idea of utilizing the existing 6AWG XHHW-2 wiring to supply a new 50 amp sub panel where I can divide the 30 amp breaker and 20 amp breaker separately, but I'm not sure if there is anything to consider that I'm not already considering regarding this approach. The manufacturer installation instructions seem to prefer a dedicated circuit (although they use softer language like "should" rather than "shall" and seem to have some conflicting information regarding whether or not it needs to be on a dedicated circuit between the instalaltion instructions for the two different appliances). The main benefit of this approach would be to provide a dedicated circuit to each appliance, although I'm not sure if this is truly required or if there are practical or theoretical advantages to this approach worth the additional effort. I believe I have adequate space to add a sub-panel in an accessible location underneath the stairs which is directly adjacent to the backside of my ovens, but don't know if I'm missing any additional requirements I should be aware of.
Lastly, I'm not sure if the combination of Table 220.55 and 422.10(A) Paragraph 4 help provide any relief.
Here are links to the ovens intended for use if someone finds this useful:
Link to Standard Convection Oven: https://www.cafeappliances.com/appl...lt-In-Convection-Single-Wall-Oven-CTS90DP4NW2
Link to Speed Oven: https://www.cafeappliances.com/appl...en-with-240V-Advantium-Technology-CSB923P2NS1
Any help would be greatly appreciated as I've spent a tremendous amount of time trying to understand how to solve this issue and am having trouble getting an electrician to make a house call to provide recommendations. Ovens are ready for delivery and I'm wanting to have a gameplan for the electrical before accepting delivery of the items.
