My PSU is rated at 650w and has 22 18g ground wires. I'm setting up connection points for the seperate voltages & ground and am wondering how many wired I need for the ground. I'm curious how current works when there are separate voltages sharing a ground.
If I have 20A running on 12v and 15A on 5v and 10A on 3.3v, is the current capacity needed for the ground = 35A (sum total of amps of each V)? Since there were so many I thought it might have been something like amps = wattage/lowest voltage so in this case (240 + 75 + 33)/3.3
I've also found WIDELY varying #'s for max amp carrying load from 1.3A to 16A per ft of 18g and some don't mention strands. Wiki has it at 14A. http://en.wikipedia.org/wiki/American_wire_gauge#Tables_of_AWG_wire_sizes
If I have 20A running on 12v and 15A on 5v and 10A on 3.3v, is the current capacity needed for the ground = 35A (sum total of amps of each V)? Since there were so many I thought it might have been something like amps = wattage/lowest voltage so in this case (240 + 75 + 33)/3.3
I've also found WIDELY varying #'s for max amp carrying load from 1.3A to 16A per ft of 18g and some don't mention strands. Wiki has it at 14A. http://en.wikipedia.org/wiki/American_wire_gauge#Tables_of_AWG_wire_sizes