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Old 12-26-2010, 06:48 PM   #1
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Water Heater Disconnect


I am in the process of buying a Dual Element 4500 watt Electric Water Heater that pulls 18.75 Amps.

My question is: Does it matter whether I get a 30 Amp or 60 Amp Disconnect? Would I be safer with a 30 Amp Disc., in case there is a short and it starts pulling more than 30 amps?

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Old 12-26-2010, 06:52 PM   #2
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Water Heater Disconnect


Does not matter. Circuit should be rated at only 30 amps anyway.

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Old 12-26-2010, 08:43 PM   #3
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Water Heater Disconnect


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Would I be safer with a 30 Amp Disc., in case there is a short and it starts pulling more than 30 amps?
No, everything is rate in amps and AIC. AIC refers to short circuit amps.
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Old 12-26-2010, 08:56 PM   #4
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Water Heater Disconnect


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Originally Posted by SeventhReign View Post
I am in the process of buying a Dual Element 4500 watt Electric Water Heater that pulls 18.75 Amps.

My question is: Does it matter whether I get a 30 Amp or 60 Amp Disconnect? Would I be safer with a 30 Amp Disc., in case there is a short and it starts pulling more than 30 amps?
A disconnet is just that, a disconnect.
It offers no protection from overload in anyway.
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Old 12-26-2010, 09:25 PM   #5
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Water Heater Disconnect


not sure it is clear to you so, a bit of explanation.

The rating of the disconnect is the maximum sized circuit you can use it on. With the 30 amp, you can run up to a 30 amp circuit through it. With the 60 amp disco, you can run up to a 60 amp circuit through it.

You shouldn't need over a 30 amp disco since you would be running a 30 amp circuit. You can use a 60 amp disco if you want though.
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Old 12-27-2010, 09:12 AM   #6
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Water Heater Disconnect


The water heater specifications probably give a maximum circuit rating as well as a recommended (30 amp) circuit rating.

The gauge of the cable conductors (any cable on that branch circuit) imply a maximum circuit rating.

If you install a disconnect switch with a higher rating for futureproofing purposes, you would not be able to upgrade the circuit to a higher ampere rating unless all other components in the circuit are compatible with that rating.

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Last edited by AllanJ; 12-27-2010 at 09:18 AM.
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