30 amp circuit for disposal/dishwasher?

[Smooth Contrails]

I was always under the impression that a shared outlet below the kitchen sink for a dishwasher and disposal was supposed to be on a 20 amp circuit.

I have seen them on 15, 20 and now 30 amp circuits.

 

[Jim W in Tampa]

I was always under the impression that a shared outlet below the kitchen sink for a dishwasher and disposal was supposed to be on a 20 amp circuit.

I have seen them on 15, 20 and now 30 amp circuits.

I would question the 30 unless name plate requires. A 20 should be able to carry both but dont forget the 50 % rule

 

[stickboy1375]

I was always under the impression that a shared outlet below the kitchen sink for a dishwasher and disposal was supposed to be on a 20 amp circuit.

I have seen them on 15, 20 and now 30 amp circuits.

No, they dont need to be 20, but 30 is completely out of the question if someone is installing a 15-20 amp receptacle.

 

[fireryan]

I would question the 30 unless name plate requires. A 20 should be able to carry both but dont forget the 50 % rule

whats the 50% rule?

 

[Pierre C Belarge]

No, they dont need to be 20, but 30 is completely out of the question if someone is installing a 15-20 amp receptacle.

Where is the code section to back this up?

 

[Jim W in Tampa]

whats the 50% rule?

if either requires more than 50% then it cant be shared. Thats very unlikely on a 20

 

[hurk27]

No, they dont need to be 20, but 30 is completely out of the question if someone is installing a 15-20 amp receptacle.

210.21(B)(2)

For the 50% rule:

210.23(A)(2)

 

[augie47]

Where is the code section to back this up?

wouldn't 220.21 prohibit it ?

 

[Pierre C Belarge]

wouldn't 220.21 prohibit it ?

I am sure you meant 210.21. :grin:

210.21(B)(3)

 

[infinity]

For the 50% rule:

210.23(A)(2)

Would that apply to two fastened in place appliance?

 

[Dennis Alwon]

Wouldn't art.422.11(G) come into play. This directs us to art. 430 part III

 

[Doug S.]

Wouldn't art.422.11(G) come into play. This directs us to art. 430 part III

I won't say it can't. However, most dishwashers and disposals I've installed have a circuit breaker on/in them. Making a mess of things? Is it merely an OL or is it a OCPD.

Either way I fail to see how 422 will effect 210.21(B)(3) and I don't plan to put 30a cord-ends or receps. in for either of those devices.


My 2?
Doug S.

 

[Dennis Alwon]

I won't say it can't. However, most dishwashers and disposals I've installed have a circuit breaker on/in them. Making a mess of things? Is it merely an OL or is it a OCPD.

Either way I fail to see how 422 will effect 210.21(B)(3) and I don't plan to put 30a cord-ends or receps. in for either of those devices.


My 2?
Doug S.

I agree but I hadn't read that a 30 amp receptacle wasn't involved. :smile: I didn't think most dishwasher had CB's

 

[busman]

I won't say it can't. However, most dishwashers and disposals I've installed have a circuit breaker on/in them. Making a mess of things? Is it merely an OL or is it a OCPD.

Either way I fail to see how 422 will effect 210.21(B)(3) and I don't plan to put 30a cord-ends or receps. in for either of those devices.


My 2?
Doug S.

I think the point was that you can't put 15 or 20 amp receptacles on a 30A circuit per 210.21(B)(3).

Mark

 

[Jim W in Tampa]

I think the point was that you can't put 15 or 20 amp receptacles on a 30A circuit per 210.21(B)(3).

Mark

He did not say receptacle , he said outlet. If it is a 15/20 amp receptacle then can not be fused at over 20. I wonder if he is confusing #10 wire as meaning 30 amps.

 

[electricguy61]

I find it easier and more "appealing" to the inspector to install a 14/3 with (2) 15 amp circuits and a double 15 amp breaker.