What fuse Size do I need?

[Quentin Jarrell 671]

As said too many times already. Fuses on powerwire are to protect the vehicle in case there is some type of grounding to the vehicle chassis or if you are trying to pull too much current through it causing the jacket to melt and catching fire.

This is really, really basic info. In fact one of the first things MECP teaches.

[An-i-no 86]

As said too many times already. Fuses on powerwire are to protect the vehicle in case there is some type of grounding to the vehicle chassis or if you are trying to pull too much current through it causing the jacket to melt and catching fire.

This is really, really basic info. In fact one of the first things MECP teaches.

A fuse near the battery yes. He's fusing his amp though. I think everybody is overlooking that.

[Quentin Jarrell 671]

It doesn't matter, if there is something drawing current on a wire the wire must be fused, if the length and diameter wire is rated at 300 amps then it needs a three hundred amp fuse.

It is very possible for any amp to short out internally causing an open circuit between power and ground. Take a two feet length of zero gauge and short it out on a battery and see what happens.

[vladd 26]

If it's so basic I would love to hear the reason why you shouldn't use a smaller fuse if your circuit won't pull the amperage your wire is rated for. Everything I've ever read uses wire size for maximum fusing and I see no reason to put the maximum size fuse I can in my circuit.

The smallest fuse you can use is always safer than the largest one you can use. By all means if this is not correct info, give me a source or even a good reason why.

http://www.bdfuses.com/derating.php

http://bluesea.com/viewresource/1441

http://www.antonine-education.co.uk/physics_gcse/Unit_2/Topic_8/topic_8.htm

http://www.littelfuse.com/data/zh/Product_Selection_Guides/Fuseology.pdf

that's the 4 that I found quickly while avoiding wiki's and forums.

[///M5 2,833]

They can't Matt.

[Impious 1,476]

If it's so basic I would love to hear the reason why you shouldn't use a smaller fuse if your circuit won't pull the amperage your wire is rated for. Everything I've ever read uses wire size for maximum fusing and I see no reason to put the maximum size fuse I can in my circuit.

The smallest fuse you can use is always safer than the largest one you can use. By all means if this is not correct info, give me a source or even a good reason why.

http://www.bdfuses.com/derating.php

http://bluesea.com/viewresource/1441

http://www.antonine-...c_8/topic_8.htm

http://www.littelfus...s/Fuseology.pdf

that's the 4 that I found quickly while avoiding wiki's and forums.

I fuse mine for the wire and not the amps for the simple fact I can then change the amp power higher if I chose without having to worry about the fuse under the hood (I have 1/0ga wire but my current amps won't pull anywhere near enough current to max out the capabilities of the wire). Just one less thing to have to think about and plan for when I'm messing around with different products, and I'm not losing anything by doing so.

I don't think anyone is saying you can't or shouldn't use a smaller fuse, but more or less making sure people understand why the fuse is there in the 1st place. Which is to protect the wire from a failure that could lead to fire, not the amps.