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Old 03-06-2019, 09:19 PM   #1
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Wire Routing

Iím in the process of correcting a wiring nightmare in my engine room and want to organize all the wiring and make it neat.
Iím installing a raceway and not sure if thereís a regulation or rule about putting the DC wires in the same raceway with the AC wires.
Anyone know what is the correct way ???
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Old 03-06-2019, 09:51 PM   #2
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I don't see an issue. ABYC is who suggests such standards.
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Old 03-07-2019, 12:31 AM   #3
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I haven't seen a copy of the ABYC standards document since the 2008 update. But, the language in that version had been there for years:

"When AC and DC conductors are run together, the AC conductors shall be sheathed, bundled, or otherwise kept separate from the DC conductors."

I googled for that specific language and I see it on Anchor's site and Jamestown's site, so I don't think it has changed:
-- American Boat & Yacht Council Standards for Boats E-11 | Ancor
-- https://www.jamestowndistributors.co...nt.do?docId=79
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Old 03-07-2019, 05:25 AM   #4
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The fear is someone working on one wire bundle DC ?

and not realizing that 120v or 240V is alive ready to bite.
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Old 03-07-2019, 06:14 AM   #5
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Thanks for the information. Iíll keep the few AC wires labeled and bundled together in the wire duct.
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Old 03-07-2019, 06:34 AM   #6
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While it's probably not an issue, AC wiring has amperage limitations when in enclosed chases due to heat dissipation. Going through a 120 degree engine room only increases that issue. Probably the only circuits that would come into play would be air conditioning run off the generator while underway. Also a good idea to keep control and electronics wiring separate from the AC wiring due to the risk of AC pulse noise interference.

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Old 03-07-2019, 09:44 AM   #7
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If wires run together a colored set of spiral wire binder (auto supply) will gather each voltage to remind you , as well as make the install neater.
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Old 03-07-2019, 09:59 AM   #8
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I'm with Ted in thinking the reasoning has to do with AC generating noise on the DC. They have similar rules for that reason under NEC that drive folks wiring inverters on shore nuts.

They could also be worried about DC voltage drop heating up AC wires but, I'd hope none of the wires would get that not. Most often all of the wire is rates for the same tempurature.
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Old 03-07-2019, 02:44 PM   #9
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Use a fire rated wireway. I would want UL94 V0 or V1.

Panduit stuff works well.

https://www.panduit.com/en/products/...s/g2x3lg6.html

Proceed with caution with anything made of polyethylene.

https://www.graybar.com/store/en/gb/...0Polyethylene}
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Old 03-07-2019, 05:50 PM   #10
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Quote:
Originally Posted by Propnut View Post
Iím in the process of correcting a wiring nightmare in my engine room and want to organize all the wiring and make it neat.
Iím installing a raceway and not sure if thereís a regulation or rule about putting the DC wires in the same raceway with the AC wires.
Anyone know what is the correct way ???
When you say "raceway" do you mean an open tray, such as commonly found in IT server rooms and network distribution? Regardless, as others have said, you want to keep them well separated and marked.

I like to keep the use of conduit to an absolute minimum (basically just for passing through bulkheads and floors/ decking) and certainly wouldn't have both AC and DC in the same conduit.
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Old 03-07-2019, 06:10 PM   #11
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Quote:
Originally Posted by FF View Post
If wires run together a colored set of spiral wire binder (auto supply) will gather each voltage to remind you , as well as make the install neater.
Great idea FF but I find a split loom much easier to apply.

Rob
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