 fuse size? |
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 Aug 22, 2006 - 2:18 PM
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 Enthusiast  Joined Aug 31, '02 From Philadelphia, PA Currently Offline Reputation: 8 (100%)  |
i just wanted to doubble check with you guys to see what fuse size i should be using for my subs. i have 2 10in subs powered by a 275watt amp. im using an 8 gauge wire with a 30amp fuse right now without any problems.
-------------------- 15PSI - 30MPG - Megasquirt Tuned
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Aug 22, 2006 - 3:16 PM
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 Administrator Joined Aug 23, '02 From Seattle, WA Currently Offline Reputation: 14 (100%) |
I run that size fuse as well with about a 300 watts RMS system, though I'm using four gauge wiring. Eight gauge wiring supposedly has a current capacity of 100 amps, but I'm not sure if wire length has to do with this.
-------------------- New Toyota project coming soon...
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Aug 23, 2006 - 10:37 PM
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 Enthusiast Joined May 16, '05 From Toronto, Ontario Currently Offline Reputation: 8 (100%) |
i thought the fuse size has to do with ur amp(s)... so whatever is on ur amp u would get one that is equal (or less) than ur amp... 30amp fuse seems real small...
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Aug 23, 2006 - 10:57 PM
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Enthusiast Joined Jul 3, '06 From Brantford, Ontario Currently Offline Reputation: 0 (0%) |
Go by the fuse size on the amp. If the amp has a 40 amp fuse run a 40 amp on your power line. If your amp has two fuses say two 20amps add them up 20+20= 40 again use a 40 amp fuse and so on...
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Sep 1, 2006 - 1:48 AM
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Enthusiast Joined Sep 1, '06 From Michigan Currently Offline Reputation: 0 (0%) |
QUOTE(OntarioCeli @ Aug 23, 2006 - 10:57 PM) [snapback]472247[/snapback] Go by the fuse size on the amp. If the amp has a 40 amp fuse run a 40 amp on your power line. If your amp has two fuses say two 20amps add them up 20+20= 40 again use a 40 amp fuse and so on... This is what i go by. I also go with same size ground wire as power. that gauge wire btw is fine for that high of a load. A good unproffesional way to check it, is after you listen to them for a while, touch the wire, see if its warm, if so you may consider replacing it with a bigger gauge. But you should be fine. --------------------  |
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Sep 3, 2006 - 6:56 AM
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 Enthusiast Joined Mar 14, '05 From Auckland,New Zealand Currently Offline Reputation: 1 (100%) |
You are fusing for the wire not the amp....
The amp already has its own fuse. You are fusing the power cable in the event the power cable might get a slit in it and short itself out to the car body which will quickly turn into a fire. Fuse as close to the power source as possible as the length of cable before it is still unprotected. From http://www.bcae1.com/ 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 These are the recommended maximum fuse ratings for the corresponding wire size. Using a smaller fuse than what's recommended here will be perfectly safe. |
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