Re: [PSUBS-MAILIST] Through Hull Connections

["Dan H." <JMachine@adelphia.net>]

Yes several,
First of all, if you have a short circuit that for some reason doesn't get
shut down in time the hot wire will melt the acrylic in contact with it.
Also if you need to add or do any wiring changes, your stuck with what you
have molded into the hull.
True, a knot would keep the wire from slipping through but remember you also
have solder any stranded wires where it passes through the penetrater
because the water will find it's way through in between the strands and
leak.

I think you would be far better off to just mold a hole in the acrylic and
build a separate penetrater.
I don't think Busby gives a detailed description of how an electrical
penetrater is made.

Dan H.


----- Original Message -----
From: <mckellar@earthlink.net>
To: <personal_submersibles@psubs.org>
Sent: Monday, April 28, 2003 8:12 PM
Subject: [PSUBS-MAILIST] Through Hull Connections


> Hi All,
>
> recent threads have opened the subject of through hull power connections.
>
> I still havent got hold of busby's or anything that may show me the proper
> way to design these connections/gaskets etc.
>
> I am still far from the 'Carsten Point' but I have been favouring a fully
> acrylic/polycarbonate hull.  With this in mind, I had imagined that
> imbedding a conducting rod directly into the hull during pouring should
> allow me to avoid ANY holes other than hatches.
>
> A similar method would be to imbed cables through the hull, laying them
out
> prior to the pour and making them part of the hull itself.  I have visions
> of extreme pressure forcing the wires into the hull, but I guess a few
> knots in the cable should prevent this.
>
> can anyone see any major flaws or problems with this idea? (cabling, not
> hull materials - i already know acrylic has some drawbacks)
>
> thx
> peter
>
>
>