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 Mast wiring conduit Question		  New Topic  Topic Locked
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clayC
Navigator

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USA
207 Posts
Initially Posted - 03/06/2006 :  11:59:08  Show Profile
I have searched the forum with out result. I know I have read somewhere about running the mast wire through the mast in a conduit but I need to know, do I use just water pvc? pop rivets? which side of the mast? As soon as my mast is in shape I splash. I had a bunch more projects but they are going to have to get done at dock side I got to get on the water!!!

Clay C
Kamalla 1980 C25 SK/TR
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OJ
Master Marine Consultant

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USA
4382 Posts
Response Posted - 03/09/2006 :  20:09:12  Show Profile
I have added an internal mast conduit.

I used the gray pvc conduit - 1" ID I think.

I layed the mast on a couple of saw horses, front facing down, inserted the conduit, inserted bar stock inside the conduit to weigh it down, drilled holes through the front of the mast and conduit, pop riveted conduit to mast, removed bar stock, pulled wires.

Good luck!
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Leon Sisson
Master Marine Consultant

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USA
1893 Posts
Response Posted - 03/09/2006 :  20:31:58  Show Profile  Visit Leon Sisson's Homepage
Clay C,

There's a very detailed description of how to add a PVC conduit for mast wiring in Don Casey's book, "This Old Boat." It's pretty much like what 'OJ' described above. I think I used 3/4" thinwall PVC, and wished I'd used one size larger (5x14ga to the spreaders, VHF coax and 3x14ga to the masthead). I ran mine up one of the aft 'corners' of the mast beside the luff groove. Using 1/8" x about 1/4" aluminum rivets, I placed two near both ends of both pieces of PVC. I added intermediate rivets about every 1-1/2' to 2'. Any wider spacing, and it gets tricky to get them drilled, lined up, and tight. The heavy bar inside the PVC is a great idea. Internal halyards complicate the installation slightly, but not much.

-- Leon Sisson
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clayC
Navigator

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USA
207 Posts
Response Posted - 03/09/2006 :  21:47:03  Show Profile
Thanks Guys, It seemed like a pretty stright forward project but I get a bit nervous. I drill this weekend even if there is 3 inches of new snow, if they can ski in it I can drill!

Clay C
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eric.werkowitz
Captain

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USA
283 Posts
Response Posted - 03/09/2006 :  22:21:58  Show Profile
When I installed my conduit I used saw horses to support the mast like OJ. I used 3/4 in pvc water pipe. I laid the pipe along side a piece of smaller molding and used it to draw a straight line down the side of the conduit. Then I drilled all the holes in the mast after marking a straight line on it. I used a small sand bag attached to another piece of conduit (so I could move it down the inside of the mast) to weight down the conduit. I used an awl throught the drilled holes to maneuver the conduit until I could see the line I'd drawn on it. Then I used a sharp drill bit to drill the holes upward through one side of the conduit and put in a short pop rivet. System worked very well. Of course you have to leave an open section at the spreader so you can get the wires to the steaming light. I also used the fore stay as a snake to run a messenger line through the conduit.
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Brooke Willson
Admiral

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USA
983 Posts
Response Posted - 03/10/2006 :  10:52:43  Show Profile
Using conduit is a wonderful thing, but if the goal of the conduit is to stop wires from slapping, there are easier and cheaper ways to accomplish the task. I used long plastic cable ties, arranged so they stuck out in four directions. They hold the wiring in the middle of the mast and make the wiring easy to pull when needed.

Brooke
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Frank Hopper
Past Commodore

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Pitcairn Island
6776 Posts
Response Posted - 03/10/2006 :  12:44:52  Show Profile  Visit Frank Hopper's Homepage
I like my method of conduit installation, I bought an 89, its factory standard!
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Notice: The advice given on this site is based upon individual or quoted experience, yours may differ.
The Officers, Staff and members of this site only provide information based upon the concept that anyone utilizing this information does so at their own risk and holds harmless all contributors to this site.