Disposer...

[1793]

I had a call about a disposer connected to a general lighting circuit, 15 amp, about the lights on that circuit dimming at the start of the disposer. The disposer is rated 6.9 amps. The panel is about 100' away. There is a MWBC in the kitchen, dishwasher and lighting. According to Article 210.23(a)(2) the disposer can be on the lighting circuit, look here. The HO is questioning the installation. I don't see anything wrong with this install as for the dimming I would think the initial start is the cause. What else could be the cause?

Edited to add full Article - 210.23(a)(2)

 

[LarryFine]

Of course the starting current is the cause. Even if the lighting and motor were on opposing lines, there could still be an effect: the light could brighten instead of dimming.

There is a problem: the customer is complaining. This is an example of performance vs. code. It also points out why I almost always separate receptale and lighting loads.

It may be legal, but the paying end-user is dissatisfied. I'd look into moving the disposer to the dishwasher circuit.

 

[1793]

... I'd look into moving the disposer to the dishwasher circuit.

I suppose I could use a three way switch to achieve this. I do see that there might be as time when the HO would like to run both at the same time. Would not the disposer AND dishwasher not over load the 15 amp circuit. How would you suggest putting these two on the same circuit?

 

[jwelectric]

Food for thought;

Take a look at 430.22(E) and the table.

How long does the disposal stay on at a time?

My thought;
Unless the waste line is removed and someone is going to grind a roast into hamburger I think it would be alright even though it might be a hard stretch on the NEC.

 

[augie47]

legal

legal

There is a problem: the customer is complaining. This is an example of performance vs. code. It also points out why I almost always separate receptale and lighting loads.

See it inspecting every week. That "low bid" the homeowner selected doesn't set as well when the job is finsihed.

 

[1793]

Food for thought;

Take a look at 430.22(E) and the table.

How long does the disposal stay on at a time?

My thought;
Unless the waste line is removed and someone is going to grind a roast into hamburger I think it would be alright even though it might be a hard stretch on the NEC.

I don't see how 430.22(E) applies. This Article,430.22, is about conductors and single motor.