[PSUBS-MAILIST] grounding question

[James Frankland]

While i was building my sub, i had quite a nasty electrical incident.

I was completing the final wiring on the batteries and i attached a locking
spanner inside the sub to the negative terminal while i tightened the other
end.  I did that no problem but unknown to me, the spanner had turned
around and come up against the vbt linkage.  Effectivly making the entire
sub negative earth, like you would for a car as alec says.

When i tightened the positive terminal, on my final turn, the spanner i had
contacted the inside of the pod and knocking the paint off, effectivly
introduced a massive short.  A huge pile of sparks and molten spanner
blasted out of the pod right into my face and continued for about 4 seconds
(which felt like forever) until the spanner melted through and dropped
off.   That was very unpleasant and i definitly wouldnt like that inside.
I was very careful to ensure all wiring is completely isolated after that.
regards
James
On 9 December 2013 13:37, Smyth, Alec <Alec.Smyth at covisint.com> wrote:

>  Hi Scott,
>
>
>
> If I understand you correctly, it sounds like you might have wired her as
> you would a car, with cables for the positive and using the chassis for the
> negative. This is a steel boat, so instead of that, what one does is two
> cables, one for positive and one for negative, but both of them equally
> isolated from the hull. Else, you are inviting a case of accelerated
> corrosion.
>
>
>
> Best,
>
>
> Alec
>
>
>
> *From:* Personal_Submersibles [mailto:
> personal_submersibles-bounces at psubs.org] *On Behalf Of *swaters
> *Sent:* Monday, December 09, 2013 12:57 AM
>
> *To:* Personal Submersibles General Discussion
> *Subject:* Re: [PSUBS-MAILIST] grounding question
>
>
>
> I connected mine to the electrical pannel through the body of the sub
>
> Thanks,
>
> Scott Waters
>
>
>
>
>
>
>
>
>
> Sent from my U.S. Cellular© Smartphone
>
>
> brian <brian at ojaivalleybeefarm.com> wrote:
> Hi All,
>               On the K boats where does one normally connect the ground to
> the sub?
>
> Brian
>
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>
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