Author Topic: Pre-season Electrical System check  (Read 2504 times)

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jezzb

  • Guest
Re: Pre-season Electrical System check
« Reply #3 on: 18 May, 2008, 09:41:01 AM »
DevX-Absolutely correct. Shall we leave your comment where it is or add it to the original text?
Best Regards
Jezz

devX

  • Guest
Re: Pre-season Electrical System check
« Reply #2 on: 17 May, 2008, 09:20:25 AM »
Actually, a detail about your comment on 12Vdc supplies.

Probably still a good idea to respect good electrical practices, but if you think about it for a moment, a human body is actually quite a low electrical load (compared to the windings of a starter motor for example) so the effect of touching anything on a 12V rail is like connecting a high ohm resister in parallel with the circuit.  12V across this 'resistor' would not result in amps in current.  It may still be sufficient to shock you - it all depends on what your body's resistance works out to be AND the contact points (for example, most dangerous ways of working is to lean above a circuit resting on one hand and probe around with your other.  You have effectively used the path across your arms and heart to create a 'resistor' connected between 12V and earth... if that results in a few 100mA current, you're in trouble :)

Things you need to take more care of probably are, any large capacitors that might have a stored charge (because that's where you might have a high voltage source you weren't aware of that for a very short duration could result in a substantial current through your body to shock you).

Makes sense?

jezzb

  • Guest
Pre-season Electrical System check
« Reply #1 on: 17 May, 2008, 12:42:40 AM »
In the months before the launch of our treasured boat, everyone thinks about oil changes, tune up

 

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