Cable protection

Submitted: Wednesday, Jul 13, 2016 at 09:08
ThreadID: 132992 Views:3291 Replies:7 FollowUps:9
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Hi all. Im running a few wires from the battery in front toolbox of the camper through to the inside back of the trailer. I've got a hole through the toolbox wall and adjacent trailer wall (these walls are about 2mm apart) and want a neat/tidy way to protect the wire from rubbing on the metal. The issue im having is because im going through two layers of steel with a small gap between them , rubber grommets are not "deep" enough. I tried a cable gland from jaycar but same problem -im not able to clear the thickness well. I could just encase the wires with split tubing and bend it through. Anyone out there got any other ideas? Thanks. Doc
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Reply By: Life Member - Fred B (ex-NT) - Wednesday, Jul 13, 2016 at 09:40

Wednesday, Jul 13, 2016 at 09:40
Had a similar problem to you. Used the corrugated split conduit. Made sure it was a tight fit, with the split at the bottom to drain any moisture collected. Sealed both ends with "neutral" curing selastic (doesn't corode or rust metals / plastics)
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Fred B
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Reply By: Member - John - Wednesday, Jul 13, 2016 at 09:52

Wednesday, Jul 13, 2016 at 09:52
Doc, not sure if these were the glands you tried, but they should be able to go thru various thickness of materials, including the gap. Come in various sizes. Good luck.



PS, just had a look at Jaycar and see that my post is not relevant.........
John and Jan

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Follow Up By: HKB Electronics - Wednesday, Jul 13, 2016 at 10:03

Wednesday, Jul 13, 2016 at 10:03
If only a 2mm gap I would do as John suggested too, use a water proof cable gland.

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Follow Up By: oz doc - Wednesday, Jul 13, 2016 at 10:53

Wednesday, Jul 13, 2016 at 10:53
Yeah looked the goods but the tail part which has a thread and lock nut isn't very long and doesn't clear the thickness. If it was single wall I'd be laughing. Doc
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Follow Up By: Member - nick b - Thursday, Jul 14, 2016 at 07:35

Thursday, Jul 14, 2016 at 07:35
The one's i'v use from a electrical store ( for electricians) are black and have a fair bit of thread .
Cheers Nick b
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Reply By: Notso - Wednesday, Jul 13, 2016 at 10:00

Wednesday, Jul 13, 2016 at 10:00
I used a bit of garden hose, tough, durable.
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Reply By: Ron N - Wednesday, Jul 13, 2016 at 10:34

Wednesday, Jul 13, 2016 at 10:34
A piece of rubber hose does it for me - either heater hose, radiator hose or fuel hose.

I keep a tea chest full of odd new hoses, and a few rolls of new heater and fuel hose on hand in my workshop, and cut off what I need when I want it.

If you have to cut the hole, cut it to fit the hose neatly - otherwise, if the hole is already there, split and trim the hose to make it fit.

Cheers, Ron.
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Follow Up By: oz doc - Wednesday, Jul 13, 2016 at 10:51

Wednesday, Jul 13, 2016 at 10:51
Thanks for this. Think I've got some fuel hose in the shed which should fit. Doc
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Follow Up By: Gary T7 - Wednesday, Jul 13, 2016 at 11:01

Wednesday, Jul 13, 2016 at 11:01
Most rubber hoses have carbon in them and can conduct electricity .Just try the hose as a spark plug lead and you will see it conducts.

Gary
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Follow Up By: Ron N - Wednesday, Jul 13, 2016 at 11:20

Wednesday, Jul 13, 2016 at 11:20
Interesting point - but I don't recall using hose as grommet material as ever creating a problem with diverting current, as the insulation on the wiring is usually quite adequate to control leakage.

If you were running bare wires through the rubber hose, yes, I could imagine that would lead to stray current.

Cheers, Ron.
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Follow Up By: The Bantam - Friday, Jul 22, 2016 at 18:38

Friday, Jul 22, 2016 at 18:38
There is a great deal of difference between conducting electricity at a couple of thousand volts in a spark circuit and 12 volts DC.

Normal rubber hose or rubber tyres for that matter will conduct bugger all ..... and I mean nothing you can measure at 12 volts.

Various house is a great insulator and protector.
I have found that with a little baby powder can thread quite long lengths of 25mm2 battery cable thru the right size PVC fuel hose.

cheers
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Reply By: 9900Eagle - Wednesday, Jul 13, 2016 at 12:53

Wednesday, Jul 13, 2016 at 12:53
Go to an electrical wholesaler or bunnings and buy a threaded pvc conduit nipple and 2 locknuts of the size you require, that will be long enough.

AnswerID: 602369

Follow Up By: oz doc - Wednesday, Jul 13, 2016 at 13:01

Wednesday, Jul 13, 2016 at 13:01
Sounds good. Electrical department I guess (not reticular ion or plumbing) doc
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Follow Up By: 9900Eagle - Wednesday, Jul 13, 2016 at 15:24

Wednesday, Jul 13, 2016 at 15:24
Yep doc that is where they are. For a better size range an electrical wholesaler would be better or you can get different size black threaded polly section and locknuts at a a rural pump outlet. I have a short length of 40mm on my bore pump.

The threaded black poly water pipe may even be available at Bunnings.

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Reply By: Hoyks - Wednesday, Jul 13, 2016 at 17:02

Wednesday, Jul 13, 2016 at 17:02
If there is any relative movement between the trailer and the tool box, then these options mightn't be that good as they may shear off. The 2nd one will probably be the better option.

An outboard motor well drain?

It is threaded the full length, so will go through a reasonable thickness of material. The internal diameter might be a bit on the large side though and they only seem to come in white.


https://www.whitworths.com.au/main_itemdetail.asp?item=13805&search123=well+drain&intAbsolutePage=1

A threaded poly water tank inlet (bulkhead fitting) would work too. They are a smaller diameter, but reasonably long thread, UV stable and come in black. The mounting hole will be smaller though, so easier to drill, and it comes with 2 nice big rubber washers to seal against dust. It would be the more robust of the two.


http://www.irrigationstore.com.au/Threaded-Nyglass-Tank-Inlet-Bulkhead-Fittings
AnswerID: 602379

Reply By: oz doc - Thursday, Jul 14, 2016 at 07:42

Thursday, Jul 14, 2016 at 07:42
Thanks guys . A few great ideas there. Will have a mooch around the various sources and see what works best this weekend. Cheers doc.
AnswerID: 602398

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