Amp power wire size question.

[2004lebanshee]

Ok I have a 22' run of Knuconcepts 4 gauge power wire which is rated at 150 Amps at 20'.

 

I originally planned on just having 1 amp and now I planning on adding a 2nd. Both amps require 1 60 amp fuse in the power wire (one amp wants takes 4 gauge and other takes 8). Can I keep the 4 gauge and run distribution blocks? This isn't typical kicker wallmart crap wire. I really don't want to run new wire but I will if its going to be a problem. I figure I'm good putting a 120 or 150 fuse in my set up and running it as is. However everything I keep reading online says just upgrade. I'm not sure if that's needed since most 4 gauge is rated at 120a and this is 150.

[nate85]

it will be fine with what you have. what amps are you gonna run?

[2004lebanshee]

1 JL HD 750/1

1 Rockford T400x4AD

 

This is actually for my boat just figured similar specs apply.

[Jeff5347]

Here's a good chart on what gauge to run for power with Amperage and distance.

 

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[2004lebanshee]

I have looked at that chart. I assumed it was counting 120 amp. 4 gauge which is why i was questioning it. On a nother site i was told i need to add in the distance of my ground to battery as well. If so im like 44 feet. Is that correct?

[Jeff5347]

I have always gone by gauge. Meaning if you run say 4g from the batt then an 8 and 4 off a dist box.... The amp w the 8 should have an 8g or higher and the amp w 4g should have a 4g ground. I don't take into acct the length of ground to add to that chart. ....only the total length of power wire. So if you have 20ft of power wire run whatever gauge is required on the chart for the length you have. Right now my sub amp calls for a 4g wire but I have a 8. I don't blast my sub right now but will be changing to the 4 once the weather isn't freezing outside

 

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[jagabom (Esquire)]

No it is not a 44 foot run. It is a 22 foot run. Use the same gauge as you run to the amp. Power in equals power out. What ever the amp draws from the supply is the same as goes back. If the 2nd amp is hooked up separately then the return must be the same as the power wire. 100 amps in equals 100 amps back.

Jim

[2004lebanshee]

Thanks.