60 amp disconnect with 70 amp circuit

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  #1  
Old 12-20-18, 07:03 PM
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60 amp disconnect with 70 amp circuit

Howdy,
Have #6 wire run to a detached garage wherein I will be installing an electric on demand hot water heater. The 13kw size calls for a 60 amp circuit and the 16kw size water heater calls for a 70 amp circuit...both using the #6 wire.

I am going to install a non-fused disconnect in front of the water heater, but my question is this: can I use the non-fused 60 amp disconnect if I elect to use the 16kw water heater that requires a 70 amp circuit?

The larger unit draws 66 amps.

Thanks!
 
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Old 12-20-18, 08:06 PM
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If there is already a 120 volt supply to the garage you can't run another power source. Sounds like you need to run a 100 amp subpanel to the garage if your main panel will even support it.
 
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Old 12-20-18, 08:55 PM
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A 16kw heater on #6 wiring is really pushing it.
You can use a disconnect larger than what the circuit is protected at but not smaller.
 
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Old 12-21-18, 05:53 PM
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can I use the non-fused 60 amp disconnect if I elect to use the 16kw water heater that requires a 70 amp circuit?

That would require a 100 amp disconnect.
 
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