Yes it will supply loads with three wires on 240, but it may also kill the user of a metal cased tool if the neutral breaks or corrodes in two as aluminum will if the insulation is breached. Also an aluminum neutral connection overstressed by a shorted cord can sometimes go open. And I've seen both happenings kill the tool users, more than once. I wasn't there. I had to investigate why and explain it to the survivors and their insurance companies. Sometimes to a jury. So I'm more than a little picky about that fourth wire.
After 4/0 wire common wire sizes are 250 MCM, 300 MCM, 350 MCM, up to 4000 MCM usually in 50 MCM steps... 250,000 circular mils cross section. M for 1000, CM for circular mils cross section. A circular mil is a wire .001" diameter having an area of pi/4 mil squared. So a solid conductor 250,000 CM would be 0.500" diameter. A stranded conductor is larger because of the air spaces between the strands. Circular mils are a little more logical than wire gauges (different for iron than copper, and different for different countries), but are a short hand ignoring the pi/4 factor by simply squaring the diameter.
After doing a 4/0 wiring job, I set my limits at 0, hire someone else for the larger sizes, they take tools I don't have and muscles too.
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Today's Featured Article - Usin Your Implements: Bucket Loader - by Curtis Von Fange. Introduction: Dad was raised during the depression years of the thirties. As a kid he worked part time on a farm in Kansas doing many of the manual chores. Some of the more successful farmers of that day had a new time saving device called a tractor. It increased the farm productivity and, in general, made life easier because more work could be done with this 'mechanical beast'. My dad dreamed that some day he would have his own tractor with every implement he could get. When he rea
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