Hello,
I have a new Powermatic PM2000, that I have run 30A – 220V wiring for. Now, the power cord to the saw came with eyelets to screw into some sort of powerbox. I stripped the eyelets and attached a twst lock plug adapter to fit into the twist lock 30A – 220V outlet I have wired up.
So, this may not be the forum for this, but I have a friend that says the wiring is wrong. My saw turns the correct direction and seems to cut fine, so maybe I should not worry about it, but I wanted to rest easy about this. I do agree with him, that 220V wiring should have four wires, and not three, like the Powermatic has. The table saw has a green (usually ground), a black (hot 1), and a white (hot 2, usually neutral). I contacted Powermatic support and they told me to wire it as this, the green (ground) goes to the (neutral/white) of the 220V wiring, and the black and white go to the hot wires(red and black) of the 220V wiring.
So, again, I shouldn’t worry too much about this, considering the saw seems to work fine. But, my friend says that the saw must be made in some foreign country, and not in America, because the wiring it uses appears to be setup for a 120V layout. Sure it is 220V, as I have it wired to a two switch breaker, to provide the 30A – 220V. I just want to let him know that it is a good American made product and that the wiring its correct, and not made for Mexican power grids. ;o)
Any input on this?
Thank You
Replies
240V (only) circuits only have 3 conductors
" I do agree with him, that 220V wiring should have four wires, and not three, like the Powermatic has."
240V single-phase mains (supply) wiring only requires 3 conductors - two ungrounded (aka 'hot') conductors, and an equipment grounding conductor. A neutral conductor serves no purpose, and is not connected to anything.
Shortened because somehow I triggered a spam filter.
Thank you for the response, TKanzler. So, should I actually be wiring up the green wire to my ground, and not my neutral? I guess I am being confused, because it is a single phase, right? Please inform me if I should be grounding it, and not hooking it to the white/neutral wire.
Thank You
Green to ground
The green in the power cable from the machine goes to ground. Neutral in the supply wiring, if it exists, is not connected to anything. Two hots, which can be any color other than white, gray, or green (with or without yellow stripe), are the circuit conductors, like any other single-phase circuit, except that neither are grounded (aka 'neutral').
The cord the manufacturer supplied probably has black, white, and green, as that's super common, but it's understood that for a 240V load, the white is the second hot conductor (paint it black or red at the plug with a marker if you prefer).
I posted a whole diatribe, but the software said I tripped a spam alarm, and wouldn't post it, so short and sweet will have to do. I haven't posted here in probably a decade - things sure have changed.
Thank You
Thank you Tkanzler. I will unhook the white/neutral I have connected to the green ground wire, and connect it to my bare-copper/ground wire. I let you know if anything goes wrong.
Not sure about this bare ground connection
Tkanzler, I have not rewired yet. It doesn't sound good to me to connect a bare wire to the green ground wire of the PM2000. The bare wire is obviously touching all the conduit, without shielding. So, why would that be helpful? Should I look into wiring the previuos white neutral to a ground, back at the box? It just sounds funny to me. Please advise.
Thank You
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