size of fuse for 1/0 awg?

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klctexas

Copper - Posts: 111

Joined: March 10, 2008

Location: Texas, United States

Posted: March 20, 2008 at 12:32 PM / IP Logged

No, no, no, i didn't buy this in an amp kit. The fuse and fuse holder came with my kicker zx1000.1 amp, and the power wire i bought all by itself on ebay.

Soldier: This is the worst part. The calm before the battle.

Fry: And then the battle is not so bad?

Soldier: Oh, right. I forgot about the battle.

klctexas

Copper - Posts: 111

Joined: March 10, 2008

Location: Texas, United States

Posted: March 20, 2008 at 12:39 PM / IP Logged

haemphyst wrote:

KPierson wrote:

The size of the fuse will NOT limit current. Increasing fuse size will not improve anything.

And I have to disagree with THIS statement... The very reason a fuse heats up and melts, (and opens the circuit) is BECAUSE it is limiting the current. The minimal voltage drop, and associated current limiting (for example - 150A) EQUALS the dissipation of energy (heat) within the fuse element, causing it to melt!

Fuses CAN limit current as they reach their nominal currrent rating. They have resistances in them, and just like ANY resistance, it WILL cause a current loss.

klctexas wrote:

I figured that 4 AWG would suffice, but while the car is at idle, my cap is dropping from 12 to 10 volts on hard extended bass notes. I have done two of the big three (the negative ones) with the same 4 AWG wire. The amps are kicker zx1000.1 and zx350.4, and the car is an 06 toyota corolla.

Then that means you don't have enough alternator, NOT that you don't have enough power cable. Additionally, just because you have a 1/0 POWER cable, you are still using the effective current carrying capability of a #4, because you have not swapped out ALL of your cables. Where does the current go? It returns through the ground to the battery. If the return in only a #4, you can't shove more current down it, just because you have a big fat positive cable, can you? No.

You have to upgrade EVERYTHING, and that includes your alternator, as we have already determined that it is too small.

Oh, and I might add this. If your return (the ground) is a #4, then in that case, YES! YOU WILL ONLY FUSE FOR THE SMALLEST CURRENT CARRYING CONDUCTOR IN THE CIRCUIT!!! 150A, in this case.

No, I always keep power and ground wires the exact same size, except for length of course. All ground connections are the same size as their power feeds and are grounded to perfectly sanded metal points.

Soldier: This is the worst part. The calm before the battle.

Fry: And then the battle is not so bad?

Soldier: Oh, right. I forgot about the battle.

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size of fuse for 1/0 awg?

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