ptcary Posted December 21, 2010 Report Share Posted December 21, 2010 (edited) Helping a friend on Mazda forum adding a RF T400 4 channel and a T500 sub amp. I think he can use 4 gauge from battery to distribution block and 4 gauge to each amp. Fuse 140 amp at battery and then 100 amp at each amplifier (per RF). Does this sound right? He has big three and otherwise stock electrical. 2010 Mazda 3. Edited December 21, 2010 by ptcary Quote PTCary 2003 SMD PT Cruiser 2011 Honda CBR 250R 2010 Mazda 3i Sport MY BUILD LOG Link to comment Share on other sites More sharing options...
dugee81 Posted December 21, 2010 Report Share Posted December 21, 2010 i would fuse 100a @ the battery, 40 & 50 to the amps. Quote 200a alt. by Excessive Amperage hc800 under hood & 2 Deka 9a31 in rear 1/0awg + big 3 SAZ 3000D HDC3 18" @ 2 ohm Link to comment Share on other sites More sharing options...
Sanitarium Posted December 21, 2010 Report Share Posted December 21, 2010 Why would you think you could take 140 amps through 4 gauge, then miraculosly get 200 amps after splitting it? Quote Link to comment Share on other sites More sharing options...
ptcary Posted December 21, 2010 Author Report Share Posted December 21, 2010 RF says to fuse each amp at 100. The general guide posted here is 140 amps for 4 gauge. Am I way off? How much will they pull on average? They are pretty efficient. Quote PTCary 2003 SMD PT Cruiser 2011 Honda CBR 250R 2010 Mazda 3i Sport MY BUILD LOG Link to comment Share on other sites More sharing options...
fullofpurple Posted December 21, 2010 Report Share Posted December 21, 2010 Why would you think you could take 140 amps through 4 gauge, then miraculosly get 200 amps after splitting it? 4 gauge can handle 150 amps????? Quote Link to comment Share on other sites More sharing options...
fullofpurple Posted December 21, 2010 Report Share Posted December 21, 2010 Why would you think you could take 140 amps through 4 gauge, then miraculosly get 200 amps after splitting it? 4 gauge can handle 150 amps????? Quote Link to comment Share on other sites More sharing options...
Guest Posted December 21, 2010 Report Share Posted December 21, 2010 Why would you think you could take 140 amps through 4 gauge, then miraculosly get 200 amps after splitting it? 4 gauge can handle 150 amps????? http://www.stevemeadedesigns.com/board/topic/1005-wirefuse-guide/ Quote Link to comment Share on other sites More sharing options...
ptcary Posted December 21, 2010 Author Report Share Posted December 21, 2010 (edited) From the sticky at the top of this section... 4 gauge: ~140 amperes Class D (~70% efficiency) - <1400 watts Class A/B (~50% efficiency) - <1000 watts Does this mean that 4 gauge can handle max of 140 and that is where it should be fused at? RF site shows both amps near 70% efficient. He would have ~1100 watts rms. Edited December 21, 2010 by ptcary Quote PTCary 2003 SMD PT Cruiser 2011 Honda CBR 250R 2010 Mazda 3i Sport MY BUILD LOG Link to comment Share on other sites More sharing options...
Sanitarium Posted December 21, 2010 Report Share Posted December 21, 2010 (edited) The point was: whats the point in the two 100 amp fuses when they are being fed by a 140 amp fuse? Edited December 21, 2010 by sanitarium Quote Link to comment Share on other sites More sharing options...
ptcary Posted December 21, 2010 Author Report Share Posted December 21, 2010 The point was: whats the point in the two 100 amp fuses when they are being fed by a 140 amp fuse? Help me out here, I am lost. RF says to use a 100 amp fuse per amplifier. But I thought that 4 gauge can handle ~140, so the power wire should be fused to protect itself and the amps fused to what RF recommends(???) Further down in the sticky it says to fuse 4 gauge at 125 amps(???) How would you fuse them? Quote PTCary 2003 SMD PT Cruiser 2011 Honda CBR 250R 2010 Mazda 3i Sport MY BUILD LOG Link to comment Share on other sites More sharing options...
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