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#90304 - 11/14/04 06:05 AM Saving money
George Little Offline
Member
Registered: 01/18/04
Posts: 1488
Loc: Michigan USA
What's wrong with using a three way switch (SPDT) for switching between the disposal and the dishwasher? I'm saving the cost of a circuit and breaker. Need code reference.
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George Little
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#90305 - 11/14/04 06:15 AM Re: Saving money
iwire Offline
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Registered: 01/05/03
Posts: 4391
Loc: North Attleboro, MA USA
Why use the switch?

How much do these units draw?
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Bob Badger
Construction & Maintenance Electrician
Massachusetts
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#90306 - 11/14/04 06:42 AM Re: Saving money
George Little Offline
Member
Registered: 01/18/04
Posts: 1488
Loc: Michigan USA
Should have provided more details. You run a single circuit, probably 14/2 to a 3 way switch located above the kitchen counter for controling a duplex receptacle below the counter where you have the disposal and dishwasher plugged in. You run a 14/3 cable from the switch to the receptacle and break the tab off separating the two halves of the duplex. Now when you toggle the 3 way switch you will be providing power alternately- Switch up- disposal runs, switch down dishwasher runs. Saved the cost of a circuit and breaker.
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#90307 - 11/14/04 06:43 AM Re: Saving money
watthead Offline
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Registered: 10/13/01
Posts: 172
Loc: South Carolina
Bob
I believe George uses the switch as an electrical interlock. When the switch is up the disposer is on, and when down the dishwasher is powered.

I guess i need to type faster.


[This message has been edited by watthead (edited 11-14-2004).]
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#90308 - 11/14/04 08:41 AM Re: Saving money
iwire Offline
Moderator
Registered: 01/05/03
Posts: 4391
Loc: North Attleboro, MA USA
I know and I do not know any code reason why you could not do this.

Also I asked why use the switch because if the GD draws 3 amps and the DW 13 amps one 20 amp circuit could be used as long as no other outlets where included on that circuit.

Bob
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Bob Badger
Construction & Maintenance Electrician
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#90309 - 11/14/04 10:10 AM Re: Saving money
drillman Offline
Member
Registered: 03/24/03
Posts: 97
Loc: Somewhere in Texas
Not sure if this is legal or not but we have something like this in the jail where I work.

The light switch for the room lights and the night lights is a three way. Up = room lights on night lights off. Down = room lights off night lights on.

At least with this method they will not forget to turn on the night lights.
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#90310 - 11/14/04 12:31 PM Re: Saving money
ElectricAL Offline
Member
Registered: 10/10/01
Posts: 597
Loc: Minneapolis, MN USA
Another variation where George's setup has benefit is putting a small instant hotwater heater on the same circuit as a garbage disposal.

One outfit markets an air switch for the control of the disposal that does exactly the same thing that George's 3-way does.

But I have to wonder about the dishwasher purely from the manufacturer's perspective. Solid state controls are appearing on more and more dishwashers. A power interruption will re-initialize the control chips. The older mechanical clock would just pick up where it lost power.
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#90311 - 11/14/04 01:09 PM Re: Saving money
Dave55 Offline
Member
Registered: 05/08/04
Posts: 697
Loc: Crystal Lake, Illinois, USA
I don't know of any code violation, but it seems a poor design, IMO. I'd personally prefer a 20-amp circuit running to the dishwasher and disposer switch, leaving the dishwasher with unswitched power.

Dave
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#90312 - 11/14/04 01:34 PM Re: Saving money
andyp95 Offline
Member
Registered: 03/05/04
Posts: 46
Loc: Vermont
I guess it would work fine that way.The question is why?With that set up,you can't run the disposal and dishwasher at the same time.I would run two circuits myself,a 12/3 would work nice.Better job that way I feel.A single 20 amp circuit would work too if a circuit needed to be saved.

[This message has been edited by andyp95 (edited 11-14-2004).]
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#90313 - 11/14/04 05:56 PM Re: Saving money
HotLine1 Online   content


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Registered: 04/03/02
Posts: 6778
Loc: Brick, NJ USA
Not to be the bearer of bad news...
Is the DW supplied with a factory cordset??
If not, does the mfg instructions say that a cord/plug connection is allowed??

References to NEC Article 400 prohibiting cord from replacing permanent wiring methods.

John
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