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Old 03-09-2014, 15:22   #16
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Re: Cable Through-Deck

crazyoldboatguy- I like the sound of what you've done
Are you able to post a photo?

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Old 03-09-2014, 15:40   #17
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Boat: Alden auxiliary ketch 48'
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Re: Cable Through-Deck

Arthur Garfield - unfortunately I am 270 miles away from the boat and won't be near her for probably a month. Think of a piece of tubing about 1" in diameter and about 3" long. SS or aluminum. Now, think of a very large washer, about 2 1/2" wide with the id the same as the pipe od - compatible material. Slide the washer onto the tube with 1/3 on one side and 2/3 on the other. Weld the washer to the tube. The hole you drill in your deck should accommodate the od of the tube. I would seal the hole in the deck no matter what the material. Insert the standpipe so that the 2/3 portion sticks upward. Drill 3 holes for mounting - I thru-bolted mine. Mount with a proper sealant.

I can feed all my cables thru this hole - one at a time. You may need a bigger diameter if you have wide fittings on the cable ends. Once the cables are thru the deck fitting, I manipulate the cable bundle so that a loop goes down to the deck and then back up to the fitting and finally looping down the fitting. Like an "S" on its side. That prevents any water landing on the exposed cables from dripping down the cables - no matter how many you have bundled together. I use electrical tape to seal the hole. Nary a drip gets down there despite green water on the deck.

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Old 03-09-2014, 18:45   #18
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Re: Cable Through-Deck

Here is a great fitting and very slick, if your budget allows - at $150 is a bit pricey.

Salty John: Cableport and other fine boat and yacht chandlery products.

Originally Posted by Blue Stocking View Post
My stepped-on-deck mast uses a thru hull to which I braised an extension for the U-shaped cable guide. Thru hull is long enough to pass thru both f/glas skins and the core.
Blue Stocking, I would like more details on your thru hull adaptation. Not sure what was meant by "braised an extension for the U-shaped cable guide". Seems like using a thru hull is a good start.
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Old 03-09-2014, 19:37   #19
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Location: Home port is San Diego, California but currently cruising the Caribbean.
Boat: Contest 48
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Re: Cable Through-Deck

My main mast had five through-deck 'clam shells', a couple of which were made by Blue Sea. The problem with those, though, is that they degraded in the tropics pretty quickly. I now see that Blue Sea offers a stainless steel cap to protect the plastic.

I was hoping to consolidate all those cable into as few deck penetrations as possible and I looked into a 'swan neck' although I couldn't find any for sale in the US - they seem to be more popular in the UK. I ultimately chose two of the Scanstrut models, which appear to be very well made.

Scanstrut – Deck Seal

We'll see how well they work when we get one of the Indian Ocean's waves covering our deck.

Fair winds and calm seas.
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Old 10-01-2015, 07:01   #20
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Boat: One-off Baron von Hoevell, 29ft steel classic
Posts: 334
Re: Cable Through-Deck

Ok guys, so this project had been put on hold for a little while, but is back on track now!

I got a gooseneck through-deck thingy (see picture) for free, and it would work perfectly. It's high enough to prevent any water to come through, has a wide base for a good seal and is easy to install.

The question remains though, do I need a separate cable clam for the HF lead or will it be alright? The gooseneck thing is SS, the other cables will be: power to ATU, sternlight (LED), depth transducer and solarpanel wiring.

Could I shield the wire in any way for the little distance it has to travel in close proximity to the other cables? It has to pass through a steel deck on a steel-hulled boat...


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