Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Rate Thread Display Modes
Old 19-05-2015, 12:25   #1
Registered User
 
redhead's Avatar

Join Date: Mar 2011
Location: PNW 48.59'45N 122.45'50W
Boat: Ian Ross design ketch 63'
Posts: 764
Images: 5
Shrink wrap as conduit?

We have non-marine heavy duty welding cable connecting battery bank to inverter and we are thinking of using shrink wrap (we found it in 4' lengths) to re-cover the neoprene coated welding cable.

Anybody tried this before?
__________________

__________________
redhead is offline   Reply With Quote
Old 19-05-2015, 12:51   #2
Senior Cruiser
 
skipmac's Avatar

Cruisers Forum Supporter

Join Date: Oct 2007
Location: 29 49.16 N 82 25.82 W
Boat: Pearson 422
Posts: 12,388
Re: Shrink wrap as conduit?

Assume you mean shrink tubing? Shrink wrap, at least around here , means the stuff in large sheets or rolls.

Shrink tube can be a bit stiff so could be a problem if you have to move or bend the cable. Otherwise, that's what shrink tube is for, to cover and protect wires.

So how come? Is the old insulation deteriorated?
__________________

__________________
The water is always bluer on the other side of the ocean.
skipmac is offline   Reply With Quote
Old 19-05-2015, 13:49   #3
Guy
Registered User

Join Date: Feb 2013
Location: So. Oregon, USA
Boat: Seafarer36c
Posts: 4,308
Re: Shrink wrap as conduit?

Our boat was wired with welding cable, back in the day. The insulation is pretty much shot. Dry and cracking. I have put shrink tube on some of the ends but it's hard to do the part that's in a bundle. Seems like it's time to change out the cable if you need to re-insulate the whole thing. Shrink tubing is not that thick and the stuff with the sealant inside that melts, is quite brittle.
__________________
Guy is offline   Reply With Quote
Old 19-05-2015, 14:22   #4
Senior Cruiser
 
skipmac's Avatar

Cruisers Forum Supporter

Join Date: Oct 2007
Location: 29 49.16 N 82 25.82 W
Boat: Pearson 422
Posts: 12,388
Re: Shrink wrap as conduit?

I would also suggest that anywhere the wire passes through a bulkhead or anywhere else it could chaff to use a grommet or other, more robust, protection.
__________________
The water is always bluer on the other side of the ocean.
skipmac is offline   Reply With Quote
Old 19-05-2015, 14:39   #5
Registered User
 
redhead's Avatar

Join Date: Mar 2011
Location: PNW 48.59'45N 122.45'50W
Boat: Ian Ross design ketch 63'
Posts: 764
Images: 5
Re: Shrink wrap as conduit?

First of all,yes, I did mean shrink tube -

The old insulation is 10 years old but appears in good shape. We have had lots of shaking heads and groans from the surveyor and the electrician we had on board. They started talking about not being code, so I don't know if they are sincere or blowing smoke up my stern.

Any feedback on covering the individual cables with split loom?

Thanks all!
__________________
redhead is offline   Reply With Quote
Old 19-05-2015, 14:51   #6
Senior Cruiser
 
skipmac's Avatar

Cruisers Forum Supporter

Join Date: Oct 2007
Location: 29 49.16 N 82 25.82 W
Boat: Pearson 422
Posts: 12,388
Re: Shrink wrap as conduit?

Quote:
Originally Posted by redhead View Post
First of all,yes, I did mean shrink tube -

The old insulation is 10 years old but appears in good shape. We have had lots of shaking heads and groans from the surveyor and the electrician we had on board. They started talking about not being code, so I don't know if they are sincere or blowing smoke up my stern.

Any feedback on covering the individual cables with split loom?

Thanks all!

So what part of this are they saying is not up to code? If the insulation isn't bad then are they saying it isn't rated for the use IE does the wiring pass through an engine space and isn't rated for that?

Is it just that the stranding isn't as fine as "marine" cable or the individual strands aren't tinned? I would defer to the experts but I didn't think tinned, fine strand wire was required by ABYC code, just recommended.

Or is the wire not properly secured to bulkheads or not protected by grommets or the end connections not properly covered???
__________________
The water is always bluer on the other side of the ocean.
skipmac is offline   Reply With Quote
Old 19-05-2015, 16:21   #7
Registered User

Join Date: Jun 2009
Location: still in a roll of fiberglass around Cape Town
Boat: Leopard 40 (new model)
Posts: 1,202
Re: Shrink wrap as conduit?

Quote:
Originally Posted by redhead View Post
We have non-marine heavy duty welding cable connecting battery bank to inverter and we are thinking of using shrink wrap (we found it in 4' lengths) to re-cover the neoprene coated welding cable.

Anybody tried this before?
I have seen this done. Still, the usual welding cable insulation plus "normal" shrink tube is flimsy compared to a proper UL cable sold for marine use, particularly if exposed to diesel or oil.

Make sure you have a BMRF fuse in your positive battery terminal. That changes the consequence of a short in battery cables from a boat fire to a blown fuse. If you have ever seen a fire caused by battery cables you will understand.

Also consider proper heatshrink with thick skin and adhesive such as the one sold by Genuinedealz.com. The regular one is a wast of time and money IMHO.

Cheers

C
__________________
svlamorocha is offline   Reply With Quote
Old 19-05-2015, 16:58   #8
Registered User
 
Reefmagnet's Avatar

Join Date: May 2008
Location: puɐןsuǝǝnb 'ʎɐʞɔɐɯ
Boat: Nantucket Island 33
Posts: 2,737
Re: Shrink wrap as conduit?

Some welding cable can perish overtime because it contains natural rubber to stop it melting in contact with hot objects. Other welding cable is synthetic and won't have this problem. The best welding cable has dual sheathed insulation and you can see the two kinds of insulation clearly when at the end of the cable.

If you want to protect the cable the best stuff to use, imo, is cloth electrical insulating tape.
__________________
Reefmagnet is offline   Reply With Quote
Old 20-05-2015, 10:01   #9
Registered User

Join Date: Jan 2015
Location: Fort Pierce, Florida
Boat: 45' Plywood Ketch, Homebuilt
Posts: 80
Re: Shrink wrap as conduit?

Shrink tubing is fine to use to insulate wires. Not sure exactly what you have, but if you feel it is too thin as some have suggested, use multiple layers. As for it making you wires too stiff, you can shrink it in place - after all, you are not going to be trying to use it to help you weld some irregular structure.

As for the adhesive, i.e., if you want it, there are many on the market that will stay flexible/not crystallize for many, many years - if ever. I will let others make that suggestion.

For whatever it's worth, although it was some years ago, I worked as a senior R & D lab tech for a company that manufactured only heat shrinkable products.

Good luck!
__________________

__________________
SVJennie is offline   Reply With Quote
Reply

Thread Tools
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Shrink Wrap Atlantic Salt Monohull Sailboats 10 12-10-2012 20:07
Life Under Shrink Wrap unbusted67 Liveaboard's Forum 12 20-09-2011 20:39
To Shrink Wrap or Not to Shrink Wrap . . . RonaldJJames General Sailing Forum 8 29-07-2010 06:22
Shrink Wrap vs Tarp unbusted67 Product or Service Reviews & Evaluations 33 01-01-2010 21:13



Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 11:25.


Google+
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.