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Old 05-10-2009, 09:46 AM   #1
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Default Electric water heaters, cord & plug?

Never came across this before, 10/3 SO cable with a 30a 3 prong dryer cord cap. "Has always been this way" she said.

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Old 05-10-2009, 09:51 AM   #2
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wonder if some body was thinkin " disconnect means " ???? for service.

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Old 05-10-2009, 09:53 AM   #3
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Originally Posted by LawnGuyLandSparky View Post
Never came across this before, 10/3 SO cable with a 30a 3 prong dryer cord cap. "Has always been this way" she said.

Never did it that way but I believe it is code compliant. It would be cheaper to put in a disco.
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Old 05-10-2009, 10:30 AM   #4
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For one, the dryer cord is not compliant, because that is a neutral terminal, not a ground.

Another is that most water heaters I have seen specifically state they are not to be cord and plug connected.
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Old 05-10-2009, 10:35 AM   #5
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My water heater has a twistlock connection for my generator.
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Old 05-10-2009, 11:19 AM   #6
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Never did it that way but I believe it is code compliant. It would be cheaper to put in a disco.

BY the time you calculate the cost [material and labor] for the cord/plug set up....a $7 30A non-fused disco would be mounted and the water made hot.
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Old 05-10-2009, 11:38 AM   #7
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For one, the dryer cord is not compliant, because that is a neutral terminal, not a ground.
I realize the difference between a neutral and a ground connection but I thought on a 3 wire dryer cord the neutral terminal is also connected to the mounting strap of the receptacle.

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Another is that most water heaters I have seen specifically state they are not to be cord and plug connected.
Gosh I don't believe I have ever read any EWH literature-- it is never there when I get there.

Again I totally agree it is at best a funky install. My MO is a DP 30 amp switch where the disco is in a nice area otherwise a non fused disco as Celtic and I mentioned earlier.
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Old 05-10-2009, 12:21 PM   #8
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I've seen a ton of water heaters without disconnect. Does the NEC say it requires a disconnect?
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Old 05-10-2009, 12:22 PM   #9
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I've seen a ton of water heaters without disconnect. Does the NEC say it requires a disconnect?
Check article 422.31
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Old 05-10-2009, 03:16 PM   #10
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My MO is a DP 30 amp switch where the disco is in a nice area otherwise a non fused disco as Celtic and I mentioned earlier.

I did about 100 of them a few years back...I still have nightmares
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Old 05-10-2009, 04:43 PM   #11
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I seem to remember that cords for appliances have to be "listed appliance connectors".
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Old 05-10-2009, 06:19 PM   #12
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Well, it's rare to see an electric WH in residential here, since electricity has always been the highest in the nation. So when I do encounter it, it's always a different setup.
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Old 05-10-2009, 06:22 PM   #13
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I sort of a toss-up how I handle it. Most of the time I use a $9 "air conditioner disconnect" when I'm wiring up a new or replacement water heater in an old work situation. On new construction work lately I've favored the handle lockoff kit for the breaker. It's only 5 or 6 bucks. I still like the local disconnect better, since it's more likely to actually get used.
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Old 05-10-2009, 06:41 PM   #14
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I live in the south and favor the the 10-3 romex shooting out from under the house to my plastic shed where the water heater is located and terminate with a flying splice outside with jap wrap
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Old 05-10-2009, 07:13 PM   #15
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I live in the south and favor the the 10-3 romex shooting out from under the house to my plastic shed where the water heater is located and terminate with a flying splice outside with jap wrap
you got a water HEATER!!!!???? when i get me a inside commode i just might me one too.
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Old 05-11-2009, 11:58 AM   #16
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you got a water HEATER!!!!???? when i get me a inside commode i just might me one too.
You need to wait on that double wide first.
They come with that there fancy indoor plumbing stuff!
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Old 05-11-2009, 04:48 PM   #17
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you got a water HEATER!!!!???? when i get me a inside commode i just might me one too.
You don't need no hot water to make that there commode work.
Theys work just fine with cold water
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Old 05-11-2009, 05:02 PM   #18
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You don't need no hot water to make that there commode work.
Theys work just fine with cold water
you guys from the big city sure knoe lots of stuff.
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Old 05-11-2009, 05:19 PM   #19
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Not many electric HWH's around here, mostly gas-fired, but when I come across one I use the cheap non-fused disconnects, the same type I use for the A/C condensing units.
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Old 05-11-2009, 05:20 PM   #20
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Quote:
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I seem to remember that cords for appliances have to be "listed appliance connectors".

I remember that also but I thought that was the literature that came with the dishwashers specifically.

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