Switched dryer circuit with kiln

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ccschoch

Member
Location
CA
Occupation
Electrician
Hey y'all, I have a customer with a dryer circuit tapped to a kiln near his laundry room. He's wondering if he can add a switch in. I can't really see any reason a 30A DPDT switch wouldn't work in this situation, but I haven't seen that done before in a residential setting (I'm mostly commercial), and I guess it "feels wrong."

210.21(B)2 states the maximum connected load for a 30A receptacle, that's really the only relevant code section I can come up with, and if the kiln and dryer are effectively interlocked, neither is connected at the same time.

So, anyone know a good code reason this doesn't work? Am I overthinking it?
 
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letgomywago

Senior Member
Location
Washington state and Oregon coast
Occupation
residential electrician
You could Interlock them in a panel with a generator interlock and then they're both home runs and no extra load calc if that's the issue. Other than that I'd avoid at all costs the issue coming up of someone saying hey my dryer doesn't work when my kiln is going even though they just had you put it in that way.
 
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ccschoch

Member
Location
CA
Occupation
Electrician
letgomywago said:
You could Interlock them in a panel with a generator interlock and then they're both home runs and no extra load calc if that's the issue. Other than that I'd avoid at all costs the issue coming up of someone saying hey my dryer doesn't work when my kiln is going even though they just had you put it in that way.
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I here you. Guy's in the trades though, don't think it'd be an issue.
 
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ccschoch

Member
Location
CA
Occupation
Electrician
letgomywago said:
But what about his wife or anyone else who lives there. Might be a non-issue but if they're not 100% on board it'll be an issue where you're expected to do the impossible to settle their argument.
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As long as his wife's opinion isn't in the NEC, not too worried about it.
 
kwired

kwired

Electron manager
Location
NE Nebraska
ccschoch said:
Hey y'all, I have a customer with a dryer circuit tapped to a kiln near his laundry room. He's wondering if he can add a switch in. I can't really see any reason a 30A DPDT switch wouldn't work in this situation, but I haven't seen that done before in a residential setting (I'm mostly commercial), and I guess it "feels wrong."

210.21(B)2 states the maximum connected load for a 30A receptacle, that's really the only relevant code section I can come up with, and if the kiln and dryer are effectively interlocked, neither is connected at the same time.

So, anyone know a good code reason this doesn't work? Am I overthinking it?
Click to expand...
210.21(B)(2) doesn't address your issue. It addresses maximum load connected to one receptacle.

If anything 210.23 would be the section that applies. There is nothing that prohibits having multiple outlets on the circuit, but the connected load does come into play. Is possible to have one circuit for multiple receptacle locations but only one utilization equipment that gets moved from one place to another.

If they want to use the kiln and dryer at same time - they risk overloading the circuit and having breaker trip. At very least make sure they understand that if they insist extending the existing circuit to add the kiln.
 
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