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 - A Lifetime of David Brown Tractors - by Samuel Kennedy. I was born in 1950 and reared on my family�s 100 acre farm. It was a fairly typical Northern Ireland farm where the main enterprise was dairying but some pigs, poultry and sheep were also kept. Potatoes were grown for sale and oats were grown to be used for cattle and horse feeding. Up to about 1958 the dairy cows were fed hay with some turnips and after that grass silage was the main winter feed. That same year was the last in which flax was grown on the farm. Flax provided the fibre which w
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