T-Pain Is On A Boat: Re: [Electric Boats] Re: Converting a Morgan Nelson-Marek 45'

Monday, June 27, 2011

Re: [Electric Boats] Re: Converting a Morgan Nelson-Marek 45'

Grainger part # 2F136 is a clear di-electric spray to lightly coat all finished installations. It's been working very nicely. I always add anti-oxidant, Grainer part # 3LP03 (not di-electric grease) inside formed cable ends, then add thermal adhesive lined shrink tubing to seal the connector to the cable insulation. Of thousands of connections, not one has ever failed or aged, some running at 500 amps. Compound-free crimped connections usually leak air, since "gas-tight" connectors would require additional soldering to seal the punched terminal bolt hole. Filling internal voids with conductive grease prevents aspiration of salt laden air, effectively making the connection gas tight.

Arby Bernt, Advanced Marine electric Propulsion

--- On Mon, 6/27/11, luv2bsailin <luv2bsailin@yahoo.com> wrote:

From: luv2bsailin <luv2bsailin@yahoo.com>
Subject: [Electric Boats] Re: Converting a Morgan Nelson-Marek 45'
To: electricboats@yahoogroups.com
Date: Monday, June 27, 2011, 9:59 AM

I like to coat all connections with silicone grease upon assembly. I also smear the stripped ends of the cables with it before crimping. Some may say this is bad practice, and probably increases resistance slightly, but my theory is that the crimping process displaces most of the grease, which is then squeezed into any remaining voids where it prevents moisture entrapment. Same for bolted connections. I recently inspected one of my early installations that was done this way 6 or 7 years ago. Batteries and cables are in a damp salty bilge and all connections were almost like new. Just some slight discoloration (darkening) of the tin plating on the terminals. A conductive grease is probably better than silicone, but that's what I use (specifically Gly brand. Many chandleries carry it).
Jim

--- In electricboats@yahoogroups.com, Kenneth Long <kelong_2000@...> wrote:
>
>
>
> "There's also the simple fact that connections do age (oxidize) despite
>
> the best we can do, and lose some current-carrying capacity. In my
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> (quite long) experience with marine electronics, 99% of all wiring
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> problems happen at the connections."
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> cover the conductors with something like this? Aluminium service wires into the home are covered in a compound to prevent corrosion. is the practice performed in marine connections?
>
> http://www.rfi-shielding.com/pages/products/compounds.shtml
>