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Wire size / fuse size question

 
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tomcostanza



Joined: 19 Oct 2008
Posts: 49

PostPosted: Mon Mar 22, 2010 12:52 pm    Post subject: Wire size / fuse size question Reply with quote

Here's my situation. I have 2 small 75W bulbs in each wing (one landing, one taxi, in each wing). 4 bulbs total. They draw 6.5A each. I used one 16ga wire to each bulb thinking that would be more than enough for 6.5A, but didn't think about the fuse.

Here's my plan. Connect one bulb from each wing to the same 15A fuse. So I'd be protecting 16ga wire with a 15A fuse, but each wire would only be sourcing 6.5A

Here's my logic. I know 16ga wire should be fused at 12.5A. But it's not like I'd ever be sourcing 20A. The only failure mode would be a short, which would blow the fuse regardless of what size wire I'm using.

Does anyone see a flaw here?

Thanks.


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Tom Costanza
-- in year 17 of a 3 year project
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nuckolls.bob(at)aeroelect
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PostPosted: Mon Mar 22, 2010 1:23 pm    Post subject: Wire size / fuse size question Reply with quote

At 03:52 PM 3/22/2010, you wrote:
Quote:

<Tom(at)CostanzaAndAssociates.com>

Here's my situation. I have 2 small 75W bulbs in each wing (one
landing, one taxi, in each wing). 4 bulbs total. They draw 6.5A
each. I used one 16ga wire to each bulb thinking that would be more
than enough for 6.5A, but didn't think about the fuse.

Here's my plan. Connect one bulb from each wing to the same 15A
fuse. So I'd be protecting 16ga wire with a 15A fuse, but each wire
would only be sourcing 6.5A

Here's my logic. I know 16ga wire should be fused at 12.5A. But
it's not like I'd ever be sourcing 20A. The only failure mode would
be a short, which would blow the fuse regardless of what size wire I'm using.

Does anyone see a flaw here?


That works.

Bob . . .


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