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Old 07-05-2008, 04:39 PM
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Fusible links

This is probably question #10325 on these dang things. Sorry!! I tried the search method and I couldn't find the answer I need.

I need to power my wiring panel and the manufacturer supplied a blue 3.0mm fusible link. This would be fine if my power wasn't coming from my trunk mounted battery to my trunk mounted panel - 2 feet apart from the master shut off switch to the panel - maybe. Since it's fully inside the car and a fusible link becomes potential fire hazard, I plan on using a Maxi-Fuse instead. The power wire appears to be 8ga but might be as small as 10ga and the link looks like 12ga. I'm looking for a correlation between amp load and and that fusible link. I've also done an internet search, but all I find is to use 4ga sizes smaller then the actual power carrying wire. I could guess, but.....

Dave W

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Old 07-05-2008, 05:47 PM
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Wire Gauge Recommended
Maximum Fuse Size
00 awg 400 amps
0 awg 325 amps
1 awg 250 amps
2 awg 200 amps
4 awg 125 amps
6 awg 80 amps
8 awg 50 amps
10 awg 30 amps
12 awg 20 amps
14 awg 15 amps
16 awg 7.5 amps

Ditch the fuseable link

Vince
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Old 07-05-2008, 09:52 PM
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re: Fusible links

Vince is dead on ditch the fusible link,you don't even want those things inside your car...as you said use Max-fuse or a aircraft type circuit breaker.


Later
Kenny
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Old 07-06-2008, 07:28 AM
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Thanks Vince. I spent well over an hour both internet Googling then here trying to find that information. I guess I didn't use the right combination of wording.

Something about fusible links, though I know that they've been used for years on vehicles, doesn't give me warm and fuzzies.

Dave W
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Old 07-06-2008, 07:36 AM
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Quote:
Originally Posted by Irelands child
Thanks Vince. I spent well over an hour both internet Googling then here trying to find that information. I guess I didn't use the right combination of wording.
Dave W
Your welcome Dave, that information came from the National Electrical Code handbook. Although I am retired my subscription to the online version is still in effect for a little longer.

Vince
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Old 07-06-2008, 07:39 AM
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Quote:
Originally Posted by Irelands child
Something about fusible links, though I know that they've been used for years on vehicles, doesn't give me warm and fuzzies.
Dave W
It was Ford Motor Company who insisted on using fusible links in their vehicles for far too long IMO. It was also Ford who had an unusually high number of vehicle fires when compared to other manufacturers.

Vince
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Old 07-06-2008, 07:49 AM
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Originally Posted by 302 Z28
Your welcome Dave, that information came from the National Electrical Code handbook. Although I am retired my subscription to the online version is still in effect for a little longer.

Vince

Vince, that's what happens when you've been retired for more then a couple of years - the brain turns to mush and I have a fairly new hard copy version of the NEC. I never even thought of looking at that source.

My son had fusible link problems on an '85 F150 pick up back in the early '90s .......hmmmmm

Dave W
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Old 07-06-2008, 08:09 AM
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Some fusible link info

"Installation and function of a Fusible Link is similar to the “cartridge type,” in-line fuse. But the Fusible Link does not deteriorate or have meltdown problems with constant use in heavy-duty systems, as the cartridge type fuse is famous for. (Chevy began installing Fusible Link wires in the main-power circuits with ’66 models, and of those old cars that are still in use, most of the original Fusible Link wires are still in place. If a Fusible Link burned out then it saved the car!)"
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Old 07-06-2008, 11:29 AM
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Thanks Malc - I had already seen that one in a 2007 post, and think you even posted it - and I still am not real happy with links.

I measured the wire to make sure that I had the right Maxi Fuse holder in my supplies (I don't, it's a 10ga but no big deal). The wire measures at about .143 which makes it 7ga and in my wiring "history" a size I had never seen - but still better then the 10ga or 8ga that I thought it was.

The 1 wire alternator wire is also the same 7ga (yes, at least for the time being, I'm using the 'dreaded' one wire alt - sorry Doc)

Dave W
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