Max power for wire size and fuse question
#1
Hey guys,
Just looking for a quick answer to a question: What is the max current that should be run over a 4 guage power wire (16 ft) and what is the largest AGU (cylinder) fuse size that could (should) be used on such a wire. I heard somewhere that the max current should be limited to something like around 130amps, is this right? Thanks,
Fabiano.
Just looking for a quick answer to a question: What is the max current that should be run over a 4 guage power wire (16 ft) and what is the largest AGU (cylinder) fuse size that could (should) be used on such a wire. I heard somewhere that the max current should be limited to something like around 130amps, is this right? Thanks,
Fabiano.
#2
*drags out canadian electrical codebook*
4 guage, 75 degree C rated conductor, 125 amps.
however... since it runs through the engine compartment, which can get pretty warm, we have to derate the cable somewhat, I'm using 40 degrees C as an ambient temperature just for the sake of arguement, which gives us a derating factor of .88
so, 125 amps, X .88 = 110 amps.
why did I do this? generally, I find that the codebook is a great guideline for setting fuse/conductor sizes
4 guage, 75 degree C rated conductor, 125 amps.
however... since it runs through the engine compartment, which can get pretty warm, we have to derate the cable somewhat, I'm using 40 degrees C as an ambient temperature just for the sake of arguement, which gives us a derating factor of .88
so, 125 amps, X .88 = 110 amps.
why did I do this? generally, I find that the codebook is a great guideline for setting fuse/conductor sizes
#5
I've done most of my own training by trial and error. I've also made lots of smoke appear from behind my dash when I was growing up. PS: Never use 22awg wire for power wire.
Something I should ask is: What equipment are you using to get 210 amps of draw.
[ June 11, 2004, 08:13 PM: Message edited by: JTerp ]
Something I should ask is: What equipment are you using to get 210 amps of draw.
[ June 11, 2004, 08:13 PM: Message edited by: JTerp ]
#7
Originally posted by Sassmaster:
*drags out canadian electrical codebook*
4 guage, 75 degree C rated conductor, 125 amps.
however... since it runs through the engine compartment, which can get pretty warm, we have to derate the cable somewhat, I'm using 40 degrees C as an ambient temperature just for the sake of arguement, which gives us a derating factor of .88
so, 125 amps, X .88 = 110 amps.
why did I do this? generally, I find that the codebook is a great guideline for setting fuse/conductor sizes
*drags out canadian electrical codebook*
4 guage, 75 degree C rated conductor, 125 amps.
however... since it runs through the engine compartment, which can get pretty warm, we have to derate the cable somewhat, I'm using 40 degrees C as an ambient temperature just for the sake of arguement, which gives us a derating factor of .88
so, 125 amps, X .88 = 110 amps.
why did I do this? generally, I find that the codebook is a great guideline for setting fuse/conductor sizes
#9