Replies

1. 
   renosteinke | Nov 10, 2009 05:55am | #1

   I am not aware of an such issues.

2. 
   restorationday | Nov 10, 2009 07:05am | #2

   Rarely have I seen it done the other way.

3. 
   TooManyToys | Nov 10, 2009 03:51pm | #3

   When I installed our disposal here in NJ 20 years ago it had to be on it's own circuit.

4. 
   Scott | Nov 11, 2009 01:33am | #4

   >>>Not from a code or circuit loading view (all my homes seem built this way)

   Really? It's a code issue here.

   DW is a motor and heating load = high current. Our code requires a dedicated circuit.

   In fact, I read this morning that the GD requires it's own circuit too, but no reason was provided. I'm surprised by this because unless it's a massive GD, I wouldn't think it would pull much current.

   Scott.

1. 
   edwardh1 | Nov 11, 2009 02:07am | #5

   Thanks, understand, my GD is small 1/3 HP maybe.

2. 
   BillHartmann | Nov 11, 2009 02:53am | #7

   Well in the US a dedicated appliance can share a circuit with other if it draws no more than 50% of the circuit rating.Now my mid level DW is rated at 9 amp max And in practice much less since I don't use the heater.And a small GD would probably be less than 10 amps.But a 5/8 or 3/4 HP would be around 12 amps. And by code could not.But in practice GD run only seconds at a time. While it might not meet current code or practices there are millions of homes with GD and DW on the same circuit and have not had a problem for years..
   William the Geezer, the sequel to Billy the Kid - Shoe

1. 
   Scott | Nov 11, 2009 07:26am | #8

   >>>While it might not meet current code or practices there are millions of homes with GD and DW on the same circuit and have not had a problem for years.Yeah, and the other factor is that regular residential branch circuits in Canada are no more than 15A - 14 guage, so it's not surprising that the code calls for a dedicated circuit for a dishwasher (although the author I was reading today strongly recommended 20A - 12 guage, but again following the code requirement of a dedicated circuit. Might as well give that load all it wants). From what I understand, you guys regularly use 20A - 12 guage for branch circuits, which gives a bit more headroom for a second load. Is that right?Scott.

1. 
   BillHartmann | Nov 11, 2009 08:07am | #9

   "From what I understand, you guys regularly use 20A - 12 guage for branch circuits, which gives a bit more headroom for a second load. Is that right?"Yes..
   William the Geezer, the sequel to Billy the Kid - Shoe

2. 
   gfretwell | Nov 11, 2009 09:36am | #10

   We also see a lot of these dish washer and disposal receptacles run with a shared neutral multiwire circuit that you Great White North guys are used to seeing in kitchens.

1. 
   Scott | Nov 11, 2009 08:56pm | #11

   >>>a shared neutral multiwire circuitThat makes eminent sense. Both circuits are running to the exact same spot; might as well share a neutral and save some bucks.

5. 
   JTC1 | Nov 11, 2009 02:39am | #6

   Here for any type of major kitchen remodel, we have to provide a separate circuit for dishwasher and disposer. Usually 20a for DW, 15a for GD 

   Replace existing - OK with whatever is in place.

   Don't know about noise and control boards.....

   Jim

   Never underestimate the value of a sharp pencil or good light.
6. 
   barmil | Nov 16, 2009 05:55am | #12

   My dishwasher and disposal are on the same 20 amp circuit. May be a code violation, but I never run them both at the same time, anyway. I don't happen to have enough slots on my breaker box to pamper these appliances with their own circuits. The previous owner had everything in the kitchen on a single 15 amp fuse, which she changed to a 30 amp because the 15 amp kept blowing. I think I saved the house by buying it from her.

7. 
   RippySkippy | Nov 16, 2009 06:07pm | #13

   Around here, we can run a 12-3 to the DW and GD, share the neutral with a 20 amp twin breaker. The code officials give it the thumbs up, and suggest it. My house is that way and we've never had a problem.