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ianwilson2
Joined: 06 Jan 2008
Posts: 33
Location: France
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 Posted: Sun Jun 01, 2008 9:33 am Post subject: As it's quiet right now, can I check a few things...... |
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I'm working on a version of Z-20 for my Jab/X-Air and as I'm an electrical newbie I wanted to run a couple of things by the group to check that I'm staying on track:-
On the Power Master Switch am I right in thinking that the 2-10 has it's first ON for just the battery and the second ON for Battery + Alternator?
Also, in the Z Figures, where there is no recommended wire size for the ground wire what should I do? For example from the ALT OV Disconnect Relay to FWL G2 and also from the Crowbar Over Voltage module to PNL G3? I'm guessing that for all of the rest I'd just use the same AWG size as I use from the main bus?
Many thanks in advance.
Ian Wilson
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rshannon
Joined: 05 Sep 2007
Posts: 62
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| Posted: Sun Jun 01, 2008 11:15 am Post subject: As it's quiet right now, can I check a few things...... |
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On Sun, Jun 1, 2008 at 10:33 AM, ianwilson2 <ianwilson2(at)hotmail.com (ianwilson2(at)hotmail.com)> wrote:
| Quote: | ..
On the Power Master Switch am I right in thinking that the 2-10 has it's first ON for just the battery and the second ON for Battery + Alternator? |
Correct.
| Quote: | Also, in the Z Figures, where there is no recommended wire size for the ground wire what should I do? For example from the ALT OV Disconnect Relay to FWL G2 and also from the Crowbar Over Voltage module to PNL G3? I'm guessing that for all of the rest I'd just use the same AWG size as I use from the main bus?
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You're on the right track. In general, the downstream ground side of any device should have the same wire size as the positive input side. In general, the theory is that there will be as much current downstream of the device as goes into it. So yes, on the Z-20 ALT OV ground use 22 AWG, same as spec'd on the input to the relay coil.
On the crowbar ground, use the same 22 AWG. Why? Well, another (sort of backwards) way to check your wire size is to look at the specified breaker/fuse on the circuit, if there is one. Here, your ALT OV relay is protected by a 5A breaker and the crowbar is designed to trip that breaker when there's over voltage, thus de-energizing the relay coil and disconnecting the ALT. Because the breaker is there to protect wire from smoking and breaking, leading to shorts, sparks, etc., your wire size should carry more than the breaker or fuse. The 5A breaker will trip before 22 AWG will fry.
To sum up, if your device draws 3A, you'll probably want a 5A breaker (next size up) and at least 22 AWG wire. (There's never an electrical problem using bigger wire than necessary -- "just" the weight penalty.)
Ron
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