Guest SyKo13 Posted October 14, 2006 Report Share Posted October 14, 2006 Keep in mind that length is a factor here as well. If you're doing a long run (>20 feet), you should use one size larger. It doesn't hurt to use a wire size that's larger than necessary, but it will usually cost more and can be more difficult to install. Power Wire: 10 gauge: ~35 amperes Class D (~70% efficiency) - <350 watts Class A/B (~50% efficiency) - <250 watts 8 gauge: ~55 amperes Class D (~70% efficiency) - <550 watts Class A/B (~50% efficiency) - <400 watts 6 gauge: ~87 amperes Class D (~70% efficiency) - <875 watts Class A/B (~50% efficiency) - <625 watts 4 gauge: ~140 amperes Class D (~70% efficiency) - <1400 watts Class A/B (~50% efficiency) - <1000 watts 2 gauge: ~220 amperes Class D (~70% efficiency) - <2200 watts Class A/B (~50% efficiency) - <1500 watts 1/0 gauge: ~350 amperes Class D (~70% efficiency) - <3500 watts Class A/B (~50% efficiency) - <2500 watts 2/0 gauge: ~440 amperes Class D (~70% efficiency) - <4400 watts Class A/B (~50% efficiency) - <3000 watts 4/0 gauge: ~700 amperes Class D (~70% efficiency) - <7000 watts Class A/B (~50% efficiency) - <5000 watts Speaker wire: 22 gauge: ~2.2 amperes 8 ohms - <36 watts 6 ohms - <27 watts 4 ohms - <18 watts 3 ohms - <13.5 watts 2 ohms - <9 watts 1 ohm - <4.5 watts 20 gauge: ~3.4 amperes 8 ohms - <96 watts 6 ohms - <72 watts 4 ohms - <48 watts 3 ohms - <36 watts 2 ohms - <24 watts 1 ohm - <12 watts 18 gauge: ~5.5 amperes 8 ohms - <240 watts 6 ohms - <180 watts 4 ohms - <120 watts 3 ohms - <90 watts 2 ohms - <60 watts 1 ohm - <30 watts 16 gauge: ~8.7 amperes 8 ohms - <600 watts 6 ohms - <450 watts 4 ohms - <300 watts 3 ohms - <225 watts 2 ohms - <150 watts 1 ohm - <75 watts 14 gauge: ~13.7 amperes 8 ohms - <1500 watts 6 ohms - <1125 watts 4 ohms - <750 watts 3 ohms - <563 watts 2 ohms - <375 watts 1 ohm - <188 watts 12 gauge: ~21.8 amperes 8 ohms - <3800 watts 6 ohms - <2850 watts 4 ohms - <1900 watts 3 ohms - <1425 watts 2 ohms - <950 watts 1 ohm - <475 watts 10 gauge: ~34.6 amperes 8 ohms - <9600 watts 6 ohms - <7200 watts 4 ohms - <4800 watts 3 ohms - <3600 watts 2 ohms - <2400 watts 1 ohm - <1200 watts 8 gauge: ~55 amperes 8 ohms - <24000 watts 6 ohms - <18000 watts 4 ohms - <12000 watts 3 ohms - <9000 watts 2 ohms - <6000 watts 1 ohm - <3000 watts Maximum Fuse Size 00 awg 400 amps 0 awg 325 amps 1 awg 250 amps 2 awg 200 amps 4 awg 125 amps 6 awg 80 amps 8 awg 50 amps 10 awg 30 amps 12 awg 20 amps 14 awg 15 amps 16 awg 7.5 amps 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. Hope this makes sense. Taken with permission from JMAC @ www.caraudio.com Link to comment Share on other sites More sharing options... 0 0
Coolwazabi Posted February 13, 2007 Report Share Posted February 13, 2007 i got a 300a fuse on my 2 gauge wire... is that bad and why is it bad if it is ? Link to comment Share on other sites More sharing options... 9 3.3k
emperorjj1 Posted February 13, 2007 Report Share Posted February 13, 2007 well it could be and probably is.... your fuse size near the battery should be optimized for the wire size to prevent a fire then another one closer to the amp (or built in if applicable) to protect the amp itself. Anyway im not 100% sure on the number for 2g but 300a seems high. my 2/0 (59## strands) is supposed to hold max 400a so J. JMy CardomainFINISHED COBALT SS/SC DUAL ALTERNATOR PICS theres no such thing as too expensive when it comes to upgrades like that, because imo if you are gonna spend to upgrade then do it correctly rather then be a cheap ass ricer Link to comment Share on other sites More sharing options... 141 5.1k
Coolwazabi Posted February 14, 2007 Report Share Posted February 14, 2007 well it could be and probably is.... your fuse size near the battery should be optimized for the wire size to prevent a fire then another one closer to the amp (or built in if applicable) to protect the amp itself. Anyway im not 100% sure on the number for 2g but 300a seems high. my 2/0 (59## strands) is supposed to hold max 400a so i don't have a fuse near the battery only one in the back close to the amp.. should i change my fuse and get a fuse near the battery and make them 200a ? or both 100a = 200a ? Link to comment Share on other sites More sharing options... 9 3.3k
andym85 Posted February 14, 2007 Report Share Posted February 14, 2007 300amp fuse is too high...200amp is the max fuse for that size wire...so drop down to a 200amp fuse. i likes me some audio stuff... Link to comment Share on other sites More sharing options... 2 5k
Guest MegaloManiac Posted February 14, 2007 Report Share Posted February 14, 2007 i don't have a fuse near the battery only one in the back close to the amp.. should i change my fuse and get a fuse near the battery and make them 200a ? or both 100a = 200a ? You want your wire fuse as close as possible to the power source eg. Battery. Link to comment Share on other sites More sharing options... 0 0
ChevyBoy Posted February 14, 2007 Report Share Posted February 14, 2007 dude you need one at your battery within 18". and you cant use a 100 in the front and a 200 in the back. that doesnt equal 300 amps. if you pull more than 100, that front fuse will pop. Link to comment Share on other sites More sharing options... 3 10.4k
Coolwazabi Posted February 14, 2007 Report Share Posted February 14, 2007 so put a 200 in the front and back or 100 in the front and back ? Link to comment Share on other sites More sharing options... 9 3.3k
lovellsz Posted February 14, 2007 Report Share Posted February 14, 2007 I would use a 200 up front and a 200/150/100 one of the three in the back of the three the 150 is my choice(but what size fuse does your amp say it needs?) I use a 120 under my hood and have a fused d block in the back with the proper fuse for each of my amps, like the 60 for my 200x2, 30 for my 40x2, 50 for my 100x2 or 400x4 RF Punch 40x2RF Punch 100x2RF Punch 200x2RF Punch 200x2RF Punch 400x4JL Audio 10W7-3"but its only a 200 watt amp tho" Link to comment Share on other sites More sharing options... 2 1.3k
Coolwazabi Posted February 14, 2007 Report Share Posted February 14, 2007 I would use a 200 up front and a 200/150/100 one of the three in the back of the three the 150 is my choice(but what size fuse does your amp say it needs?) I use a 120 under my hood and have a fused d block in the back with the proper fuse for each of my amps, like the 60 for my 200x2, 30 for my 40x2, 50 for my 100x2 or 400x4 idk.. what ever fuses the orion 2500 has... Link to comment Share on other sites More sharing options... 9 3.3k
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