What fuse size?

[shimmyz 10+ year member]

Well, if you'd search your info first, you'd realize you fuse the wire as per wire gauge / length... it has NOTHING to do with the amps.

And as you see from here: http://www.bcae1.com/wire.htm

A little bit down, it will say the recommended maximum fuse.

And to clear up... the "common practice" of adding up the fuses on your amps and using that to fuse the wire is one, ignorance, and two, for cost reasons. While that wire won't need to run more than X amount of amps, as it's known, amps have internal fuses (most modern ones do). The fuse is just in case there's a power surge, or the amps are trying to pull too many amperes through the wire, it's to cut the connection so that the wire doesn't get too hot and catch on fire.

Wire on fire = car on fire = Bye bye car / audio.

Oh, and OP: You might want to upgrade to 4-AWG power wire from your battery to your distro block. Your amps aren't getting enough power. They're pulling 90 amps, and the most 8 AWG can do is about 50 amps. If you plan on upgrading anytime in the future, save up more and buy 1/0 AWG (Or 0 gauge). This size will be able to power I believe up to about 3,000 RMS.

I was assuming the proper gauge wire is being used when I offered my input.

If you would read the link you provided you would notice it says Recommended

Maximum Fuse Size.

The chart also states "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".

 

[DOOM_NX 10+ year member]

Anyone has any clue what amperage the grey fuse is? ANL grey audison fuse...

 

[DOOM_NX 10+ year member]

By the way how do I know how many Ampers my amplifiers are drawing? Both are A/B amplifiers one rated at 300W RMS and the other 4x60W RMS...

 

[n2audio 5,000+ posts]

By the way how do I know how many Ampers my amplifiers are drawing? Both are A/B amplifiers one rated at 300W RMS and the other 4x60W RMS...

Without a current clamp meter or some other current measuring instrument you don't.

There are several factors if you're trying to calculate, or at least approximate ACTUAL current draw, but you can be sure it's no where near the sum of the fuses on the amp. A 300w class a/b is going to draw something less than 10A at anything much less than full power , and the 4x60 less than that.

That's why you use rms capability and/or on-board fuse size to determine the size of the wire and fuses to use.

 

[DOOM_NX 10+ year member]

OK, here I come with news.

I told my installer yesterday, while we were installing the Focal 165 A1 speakers, about the main wire and fuses. We didn't upgrade them the other day because he was in a hurry. Of course, he replaced the wire without question.

So, now I got a 4 meter 4AWG wire fused at 100A going to the distribution block and 2 8AWG wires going to the amps. ZX300.1 wire is fused at 50A and Hertz EP4 at 40A. I think we're OK now...