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Old 04-10-2009, 03:09   #1
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I'm Probably Overthinking This...

I'm probably going to have 240 volt AC cables running alongside 12 volt DC cables in the same large 90mm conduit.

Is there a possibility that the AC will cause an induced current in the DC wiring? Should I try to seperate them further?

Or am I just thinking about it too much?
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Old 04-10-2009, 03:59   #2
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Circuits from separate sources, such as an AC and a DC panel, should not be run in a common conduit, nor terminate in a common box. I would identify the access points, noting "WARNING - 2 sources - AC and DC"
Yes, AC conductors can cause inductive “noise” in DC conductors, which can be troublesome in data & communication wiring.
So, while best practice would compel you to separate the two, I don’t think it will be a critical deficiency.
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Old 04-10-2009, 04:35   #3
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I would at least use a double insulated run & maybe extension lead form of at least 15A may do. Tinned wire if available. I will be checking what options I have tomorrow. I am faced with the same problem next week having limited space for additional wiring.Inductive currents are a small risk but AC loads on a sail boat would be normally light intermittent & the DC circuits should be relative low impedance.

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Old 04-10-2009, 11:46   #4
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If you must run them together, twist the pairs if you can, i.e. twist the DC pair, then twist the AC pair, and install them without twisting all of them together. That will reduce any crosstalk you may encounter.

Steve B.
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Old 04-10-2009, 14:33   #5
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Thanks for the advice guys. The DC circuits in this conduit are just lighting and pump wiring, so it sounds like there shouldn't be any real problems.

Thanks again.
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