[Public-List] Deck Penetration for Mast Wires

Marcelo D. Gentinetta vanguard64 at cox.net
Thu Mar 5 13:13:17 PST 2020

On mine, I use a cable clam from Blue Sea Systems. It handles my duplex and triplex mast wires. The VHF coax goes through a Perko through deck coax fitting.  So far, these have worked well although at some point the rubber seals will have to be changed. The wires come out on the head side of the bulkhead and into a junction box with a terminal bar. 

Marcelo #441

> On Mar 5, 2020, at 2:14 PM, George Dinwiddie via Public-List <public-list at lists.alberg30.org> wrote:
> Jonathan,
> I've thought about something like https://s3.amazonaws.com/s3.supplyhouse.com/images/products/zoom/5-414-3.jpg <https://s3.amazonaws.com/s3.supplyhouse.com/images/products/zoom/5-414-3.jpg> to keep water intrusion out in all but the most extreme conditions. The wires can come out of this and go to the hole in the side of the mast. I've been thinking about this for years, but still have the leaky gland nut (similar to https://www.plastimo.com/media/catalog/product/cache/2/small_image/210x/9df78eab33525d08d6e5fb8d27136e95/n/a/nav_15238___1.jpg <https://www.plastimo.com/media/catalog/product/cache/2/small_image/210x/9df78eab33525d08d6e5fb8d27136e95/n/a/nav_15238___1.jpg>) through the deck.
> I've got the old RG-8U antenna cable, so have a UHF through-bulkhead connector https://i.ebayimg.com/images/g/MZwAAOSwA4dWMqDH/s-l640.jpg <https://i.ebayimg.com/images/g/MZwAAOSwA4dWMqDH/s-l640.jpg> going through the deck with separate wires connected above and below decks.
> - George
> On 3/5/20 12:43 PM, Jonathan Bresler via Public-List wrote:
>> Folks,
>> Thinking of redoing the deck penetrations for the mast wires on Constance.
>> Currently there are three distinct penetrations, two to port of the mast
>> base
>> and one to starboard. All enter the v-berth just forward of the mast beam.
>> The wires get stepped on from time to time. They are not well protected from
>> damage.   The wires are: electrical cable for steaming, deck, anchor lights
>> and ground, VHF cable, signal cables (16 or 18 AWG) for Raymarine ST60
>> wind instruments.
>> Thinking about having a single penetration, just aft the base plate,
>> entering
>> into the head/hanging locker area. One penetration large enough to hold all
>> the wires.  Would fill the penetration with putty or expanding foam or
>> "what
>> woud you recommend".  Playing with the idea of perhaps a 3/4" thruhull
>> topped
>> by a 90 degree elbow so that water does not pool/sit on the top of the
>> opening.
>> One of these (
>> https://www.groco.net/products/fittings/pipe-to-hose-elbows/ffc-series-npt-full-flow)
>> might do the trick, but does seem a bit bulky.
>> Thank you,
>> Jonathan
> -- 
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