It's fair to say that all 240V equipment that doesn't also have 120V loads
doesn't need a neutral.
IME, big iron woodworking equipment consists, electrically, of a motor and a
240V motors don't need a neutral.
As long as 10ga wire, and a 30A breaker, are appropriate for the load, you're
good to go with 10/2 -- but consider that 10/3 would provide the ability to
add 120V receptacles later if you need them.
Another thought might be to pull three individual conductors (red, black, and
green) through conduit, instead of running cable. Then if you ever need a
neutral in the future, pull a white wire through too.
Doug Miller (alphageek at milmac dot com)
Now, if you can convince my framing and trim crews of that, who routinely
use two wires with NO plug to run their 220v equipment, my hat will be off
to you! ;)
And for the OP ... In the sense that 220/240 equipment will work without a
ground wire (just a hot from each leg is all that is "needed" to function),
you don't "need" a ground for the equipment to work.
BUT, and it's a BIG but, you will surely want to have a ground, if for
nothing else but code compliance and safety.
The neutral is not used for 220/240v unless the equipment needs 115v
internally for timers, lights, etc ... not something normally found in
woodworking shop equipment.
Now, we sit back and wait for the flames to start ...
*smacking my forehead on my desk*
OH NOES!!!, Not THIS farking topic again????
As an EE, my philosophy is very simple: If you need to be asking
questions like that, you shouldn't be screwing with it. And to even
THINK about whether to use a ground or not is simply beyond me.
I have seen accident reports and photographs come across my
desk-------->>>220 can bite your ass big time, blow off a few fingers
if you're really lucky and the juice doesn't go from one hand via your
chest anywhere. That 220 will kill you.You will not be pining, you'll
pass on. You will be no more. You will have ceased to be. Expired and
gone to meet your maker. You'll be a stiff. Bereft of life, you'll rest
I think the stock answer, here in the Wreck, should be: "GET AN
And while the electrician is there, have him run some ground wires on
your dust collector.
... and joint that sumbitch while you're at it!
BTW, there is, or used to be, an "Electrical FAQ" posted here periodically
back in the much kinder, gentler days of the _real men wooddorkers_ of yore:
Don't know if it is still valid cuz one of the necessary qualifications for
the previously mentioned wooddorkers was having the (kinder, gentler) time
to read through it.
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