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Can I wire a water heater and a tanning bed on the same 220V breaker. I live in Ohio.

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  • How many amps is the breaker? How many amps is the heater? How many amps is the tanning bed? (And, as an aside, aren't you at all worried about melanoma?) Apr 4 '16 at 18:32
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The 2014 NEC is adopted in Ohio.

You need a dedicated circuit for these appliances: Refrigerator, Freezer, Electric range, Microwave, Water heater, Washer, Dryer, Dishwasher/garbage disposal, Furnace, Heat pump, Air conditioner (central and window), Sump pump, Hot tub/Sauna/Jacuzzi

A furnace requires a dedicated circuit.[422.12]

Dwelling units require at least one receptacle outlet for the laundry area. [210-52(f)] Laundry receptacle outlets in dwelling units must be fed from a 20-ampere branch circuit. Receptacle outlets outside of the laundry area are not permitted on the laundry circuit. [210-11(c)(2)]

If an appliance is a chord and plug type and it exceeds 80% of the branch circuit rating then a dedicated outlet is required. If the appliance is fastened in place and is rated for more than 50% of the branch circuit then that circuit must be dedicated. [210-23(a)]

Here is a terrible reference, but: http://electrical.about.com/od/appliances/qt/DedicatedCircuit.htm makes a good point, "A good rule of thumb is that if it has a motor, it needs its own circuit."

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    Do you have a code reference for all this? Many of those definitely do NOT require a dedicated circuit. Apr 4 '16 at 19:13
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    You're right, that IS a terrible reference. Sorry, I don't use about.com for my electrical advice and code requirements. I go to the source. .... And their rule of thumb about anything with a motor needing it's own circuit is rather absurd. Apr 4 '16 at 19:54
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Even if you could it is not at all a good idea. Bottom line is if the water heater is on a 30A circuit then you CANNOT do this unless the tanning bed draws approx. 6 amps or less, which is highly unlikely.

The max load on a 30A circuit is 30A, and the limitation is 125% of a continuous load (a storage water heater is to be considered a continuous load, so just under 24A for a 4500 watt unit) plus that of the non-continuous load.

210.19 Conductors — Minimum Ampacity and Size (A) Branch Circuits Not More Than 600 Volts. (1) General.

Branch-circuit conductors shall have an ampacity not less than the maximum load to be served. Where a branch circuit supplies continuous loads or any combination of continuous and noncontinuous loads, the minimum branch-circuit conductor size, before the application of any adjustment or correction factors, shall have an allowable ampacity not less than the noncontinuous load plus 125 percent of the continuous load.

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  • Are all 220V circuits 30A? Are all water heaters? One should never rely on "125%" margins, they are called "safety" margins for a reson.
    – Sam
    Apr 4 '16 at 19:32
  • @Sam, WHERE did I say all 240V circuits are 30A? Where did I say all water heaters? I said "If it is a 30A circuit..." .....And what is a ""safety margin"*??? I am not familiar with that term in the code book. Have you ever read NEC 210.19? ...... And why not rely on whatever the code book says? Are you implying that something that is code legal may for some reason not be safe?? That's a VERY bold assumption. .... And instead of just dropping a negative and your opinion show me where I am incorrect. Apr 4 '16 at 19:48
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    @Sam I think what Speedy means about 125% is, if you have a continuous load (say 20A), it counts as 125% of that (25A) when tallying what is allowed on that circuit. For instance the 125'd value of 25A, plus an intermittent load of 6A, would exceed 30A and would not be legal on a 30A circuit. If you notice, water heater makers often game that rule by making them 23A. Apr 4 '16 at 20:13
  • @Sam, care to clarify? Apr 4 '16 at 22:30
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    No, 210.23(A) is 15 & 20 amp. 210.23(B) is 30 amp. 210.23(A) does not apply here. Apr 5 '16 at 14:53
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Absolutely. I used an 8 ft. length of the appropriate wire, a receptacle that fit my tanning bed plug and wired straight into my hotwater heater. I put the receptacle in a utility box to make it safe and never had a problem. Everything was 220 volts.

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  • How many amps/watts is your hot water heater, and how many amps/watts is your tanning bed? Jan 3 '21 at 15:57

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