Wiring Hot Water Heater - Cable Choice

Old 03-02-14, 05:53 AM
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Wiring Hot Water Heater - Cable Choice

Hey Guys,

I purchased a HPWH and will install it this week,. I know I need 10/2, 30A/240 breaker, but my question is wire. Do I need to run shielded cable or can I simply run romex? The heater is 10 feet from the service panel, and the wires will run up, along a joist, and then directly down to the heater from above.

Another option would be to run the romex in pvc conduit for the straight shot down to the heater.

What is common practice here?


Old 03-02-14, 06:28 AM
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As long as your area accepts NM cable and it is not subject to damage it should be fine.
Old 03-02-14, 07:16 AM
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It depends on what your AHJ allows, but in my area you would have to use steel flex to drop the the heater. NM-B cable (aka romex) would be used to a 1900 box above the water heater and the flex would attach to the 1900 box.
Old 03-02-14, 07:36 AM
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If you drop it down from the ceiling you could stand up a short piece of pipe (EMT, Flex conduit, or PVC) and sleeve the Romex down the pipe. Be sure to install a connecter or coupling on the open end to bush it, and strap it at the top to the framing.

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