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Old 09-16-2008, 12:43 PM   #1
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electric cable crossing (hot water) copper pipe


i have a scenario in which a pair of water-supply pipes go parallel and in between beams in the ceiling while a couple of electric cables cross them perpendicularly and actually rest on those pipes rather than being above. i was just curious if this presents a hazard of some sort, e.g. can the hot pipe over time melt the insulation on the cable, causing current in the water supply etc. ?

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Old 09-16-2008, 01:20 PM   #2
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electric cable crossing (hot water) copper pipe


Does the insulation show any signs of heat damage? Modern NM-B cable is rated at 90 degrees Centigrade (194 degrees Fahrenheit), so it should be fine. Older NM cable was only rated at 60 degrees Centigrade, which should be OK unless the water heater thermostat is turned up very high. I would probably separate the cable from the hot water line or stuff a bit of insulation in between just to be on the safe side.

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Old 09-16-2008, 03:52 PM   #3
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electric cable crossing (hot water) copper pipe


i just did it so there would be no signs yet but was getting suspicious looking at it.
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Old 09-17-2008, 01:49 PM   #4
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electric cable crossing (hot water) copper pipe


The foam-type snap on pipe insulation has worked well for me to keep something off a warm pipe- also helps keep the heat inside if done full length on the warm pipe.
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Old 09-17-2008, 05:10 PM   #5
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electric cable crossing (hot water) copper pipe


Your water plumbing and your insulated wiring can occupy the same space in nearly all cases without violating the code or creating any specific hazard.
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