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Fusing for my amps

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Topic review
   

Expand view Topic review: Fusing for my amps

by Bwcad1 » Tue Aug 25, 2009 4:48 pm

Fuses are rated based on the current and time. Say it takes a 60 amp fuse 3 seconds to blow well that means it will take 120 amps for 1.5 seconds and 240 amps for .75 seconds and 480 amps for .375 seconds and 960 amps for .1875 seconds. This is how we got away with running huge amps on small fuses. This is just an example please dont quote these numbers.

by falkenbd » Tue Aug 25, 2009 2:23 pm

Sounds like you have the distro block already, so use it.

refer to the chart I posted above (don't put bigger fuses on the wire than recommended)

YOU can help prevent forest fires (caused by car fires)!

by Tim » Tue Aug 25, 2009 2:18 pm

Okay, I can accept this. I do however have a question, My amps take 4 gauge as the largest that will fit. If I just run a single 2 gauge run from the battery to the trunk, how will I split it off for the amps?? I already have my dist. block (it is a fused type from streetwires), the underhood fuse holder is on its way. I have a 200 amp unit for under the hood, and a 100 amp for my sub amp, they had no fitty amp for my mid amp. I will have an extra 100 amp I bought a 2 pack cause it was cheaper, I may use it under the hood.

I will make it as short as possible going from the battery, (like 10 inches or under like Bill said), cause that just makes good sense really.


Tim

by falkenbd » Tue Aug 25, 2009 2:16 pm

I currently have my 2 zuki eleets installed, 0/1 to the back and 4 awg to the amps

Up front I only have a 100 amp fuse. Fuses generally don't blow unless there is something wrong, I bet a 100 amp fuse can take 200 amps briefly (heck maybe even more).

by Bwcad1 » Tue Aug 25, 2009 10:34 am

falkenbd wrote:Actually, a 125 amp fuse up front, on the amps with fuse ratings you listed, I can say for certain it won't blow, unless it needs to...

Just for fun, you should use a 50 amp fuse and see if it blows (depending on the type, it probalby won't)

On stock electric, with stock grounds and such, you'll probably run into voltage issues before you pull enough current to blow the 125 amp fuse.
Back in the day when i ran meca and dbdrag fusing was how meca rated your classes. I could burp an MM4000.1 on a 60 amp fuse...

by falkenbd » Tue Aug 25, 2009 10:30 am

Actually, a 125 amp fuse up front, on the amps with fuse ratings you listed, I can say for certain it won't blow, unless it needs to...

Just for fun, you should use a 50 amp fuse and see if it blows (depending on the type, it probalby won't)

On stock electric, with stock grounds and such, you'll probably run into voltage issues before you pull enough current to blow the 125 amp fuse.

by Bwcad1 » Tue Aug 25, 2009 10:22 am

falkenbd wrote:I'm going to throw a wrench into the gears here.
Use a 125 amp fuse up front, and no fuses on the 4 awg.
It'll be safe... Know why? Will it ever blow from your amps? I HIGHLY doubt it...
It is nice however to have a fused distro in the trunk, but its not needed here.
dis man knows his chit.

I have an Mbquart discuss 1000.1 about 1200rms at 1 and a DSC4125 on a single run of 0 gage with a 150amp fuse in the front. None in the back.

by falkenbd » Tue Aug 25, 2009 10:20 am

Tim wrote:I am using 2 gauge at the battery, run about 15 inches to a fuse, I got a 200 amp, then going on the fuse at the battery to the dist.block in the truck and splitting off to 4 gauge for both of my amps.
tim
I'm going to throw a wrench into the gears here.

Use a 125 amp fuse up front, and no fuses on the 4 awg.

It'll be safe... Know why? Will it ever blow from your amps? I HIGHLY doubt it...

It is nice however to have a fused distro in the trunk, but its not needed here.

by Bwcad1 » Tue Aug 25, 2009 10:18 am

Tim wrote:what length would you do??
Iread a Iasca rule book, granted it was a long time ago, but then the lenght was 18 inches.
How can I say it, if it is fifteen inches or 10 or whatever it is protection for the car itself. If the wire overheats it will cause damage to the car if there is no fuse on it. You only damage a small section of wire as opposed to the whole car. This way the hot (damaged) wire wont make it into the cabin itself.
Is that right, if you can understand any of that.
Tim
Yessir for the most part. I try to keep mine under 10 inches as close to the battery as physically possible. The smaller the wire the less chance it has of causing serious damage. Remember if you do an install on a buddies car and it burns to the ground you are 100percent liable.

by Tim » Tue Aug 25, 2009 10:14 am

Bwcad1 wrote:The 200 amp is fine but 15inches is a little to long IMO, do you know y that is? Before anyone chimes in and speaks up i want Tim to learn this instead of someone just giving him the answer.
As far as your 4ga id probably have a 100 on each one and be done with it.
what length would you do??




Iread a Iasca rule book, granted it was a long time ago, but then the lenght was 18 inches.


How can I say it, if it is fifteen inches or 10 or whatever it is protection for the car itself. If the wire overheats it will cause damage to the car if there is no fuse on it. You only damage a small section of wire as opposed to the whole car. This way the hot (damaged) wire wont make it into the cabin itself.

Is that right, if you can understand any of that.

Tim

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