KentAT
Senior Member
- Location
- Northeastern PA
I saw this on a diy forum, and I must admit I could not come up with a rationale to answer this due to some terms I see in 210.21 thru 210.24:
The OP was:
I have two cooking appliances that are rated 12A @ 240V in a non-dwelling and not a kitchen (no sink in this room).
Can I put these on a single 30A 2P circuit?
My confusion is that they each use a 15A 240V cord and plug connection. Each is 12A, circuit rating needs to be 12A X 125% = 15A. However, 210.21(B)(3) reads:
(3) Receptacle Ratings. Where connected to a branch circuit supplying two or more receptacles or outlets, receptacle ratings shall conform to the values listed in Table 210.21(B)(3), or where larger than 50 amperes, the receptacle rating shall not be less than the branch-circuit rating.
Tables 210.21(B)(3) and 210.24 identify that receptacles on 30A branch circuits must be rated at 30A. My receptacles will be 15A/240V to match the appliance cords.
Does this mean I have to run two 15A 2P circuits?
__________________
At first I thought running the 30A circuit to supply both of these cooking appliances would be OK if it was run in 10AWG, but now I'm not so sure.
I am getting confused by the heading "Receptacle Rating (Amperes)" on tables 210.21(B)(2), 210.21(B)(3), and the summary table 210.24. Is this rating meaning a minimum, a maximum, or an exact rating?
If it is a minimum, then I thought the two 15A 240V receptacles cannot be used on the single 30A circuit unless the receptacles are rated 30A (but I don't think 240V receps would be rated at more than their NEMA connection style). If it is a maximum, I thought the OP can use a single 30A 240V circuit to supply both 15A 240V outlets, like having multiple 15A receptacles on a 20A circuit.
P.S. Checked the post again, and the OP said the two appliances will be used at the same time.
Kent
The OP was:
I have two cooking appliances that are rated 12A @ 240V in a non-dwelling and not a kitchen (no sink in this room).
Can I put these on a single 30A 2P circuit?
My confusion is that they each use a 15A 240V cord and plug connection. Each is 12A, circuit rating needs to be 12A X 125% = 15A. However, 210.21(B)(3) reads:
(3) Receptacle Ratings. Where connected to a branch circuit supplying two or more receptacles or outlets, receptacle ratings shall conform to the values listed in Table 210.21(B)(3), or where larger than 50 amperes, the receptacle rating shall not be less than the branch-circuit rating.
Tables 210.21(B)(3) and 210.24 identify that receptacles on 30A branch circuits must be rated at 30A. My receptacles will be 15A/240V to match the appliance cords.
Does this mean I have to run two 15A 2P circuits?
__________________
At first I thought running the 30A circuit to supply both of these cooking appliances would be OK if it was run in 10AWG, but now I'm not so sure.
I am getting confused by the heading "Receptacle Rating (Amperes)" on tables 210.21(B)(2), 210.21(B)(3), and the summary table 210.24. Is this rating meaning a minimum, a maximum, or an exact rating?
If it is a minimum, then I thought the two 15A 240V receptacles cannot be used on the single 30A circuit unless the receptacles are rated 30A (but I don't think 240V receps would be rated at more than their NEMA connection style). If it is a maximum, I thought the OP can use a single 30A 240V circuit to supply both 15A 240V outlets, like having multiple 15A receptacles on a 20A circuit.
P.S. Checked the post again, and the OP said the two appliances will be used at the same time.
Kent
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