Eskii Posted February 27, 2009 Report Share Posted February 27, 2009 Is fusing a single run of 4GA with a 150A fuse too much if i'm running a T400.2 (100A fuse) and P300.2 (50A fuse)? Previous: 1988 Nissan Patrol Rockford T800.4 Rockford T1 15 (sealed) Rockford 6.5 Components Current: 1997 Jeep Wrangler Build goals... 1x RF P300.2 4x Hertz HCX165's Built Completes Alpine 9886 Headunit RF P300.2 RF P500-1bd 2x RF P2-D2 8" Subs, 1.3 cubes @39.5Hz 4x Hertz HCX130's Current comment... Satisfied for the moment, focusing on performance upgrades Link to comment Share on other sites More sharing options...
alvitae Posted February 27, 2009 Report Share Posted February 27, 2009 4 gauge wire is commonly used as a main power wire. Fuse 'A' must be rated to protect wire 'A'. Any fuse rated at less than ~150 amps is sufficient to protect a 4g wire and the vehicle (if the 4g wire is longer than ~15 feet long, you may want to limit the fuse to ~125 amps). that is from bca1 bca1 Link to comment Share on other sites More sharing options...
creyc Posted February 27, 2009 Report Share Posted February 27, 2009 150 is the current carrying capacity of 4 awg wire, so you're fine if your power wire is 15 feet or less. You're right on the edge however, and would likely benefit slightly from reduced voltage drop by jumping up to the next size power wire if you can afford it. It's a "nice to have", but you're safe with 4 awg. 2001 Chevy Blazer (2) SAZ-3000Ds (2) custom 18" Madmax subs in a second row wall Rockford 600-4 Pioneer PRS components Pioneer P800PRS deck Link to comment Share on other sites More sharing options...
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