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Old 08-07-07, 11:11 AM   #1
phantomcow2
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PLEASE HELP, 3 PHASE hookup?


This day sucks.

Anyways, I need to replace the cord going to the bridgeport at work....very soon.
I bought a new cord and connected it to the plug. I know that when I hooked up a 3 phase machine, 3 of the wires could go anywhere, as long as the ground wire in the proper place.

is there any special attention to be paid when hooking this wire up to a 3phase motor?
RIght on the plug It says "X, Y, Z, and G".
G is ground obviously, and xyz are the phases. But on the actual contactor (or whatever it's called), that hte wires screw into, it doesn't have anything except "1,2,3".
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Old 08-07-07, 11:12 AM   #2
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Phobias are for irrational fears. Fear of junk ripping badgers is perfectly rational. Those things are nasty.
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Old 08-07-07, 11:41 AM   #3
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try hooking 123 to xyz. if it runs backwards (or explodes), switch any two wires. i.e. 213 to xyz
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Old 08-07-07, 12:00 PM   #4
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It works . Thankyou for your helpful replies.
I think it's running in reverse, but I'm going to leave it that way so when my co worker comes back, he'll be confused.
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Old 08-07-07, 12:16 PM   #5
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Like others have said - hook those three wires up in whatever order pleases you. Turn it on then off quickly. If it buzzes / run backwards then disconnect any two wires and swap them.

Used to have to do this all the time in the army.
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Old 08-07-07, 11:57 PM   #6
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Our generator mechs from utilities platoon weren't real bright in the Marine Corps. One time one of them wired one of the phases to the ground rod instead of the 10K pod. You would not believe the sparks that thing threw when he fired it up!
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Old 08-08-07, 12:56 AM   #7
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Did you check it had the correct insulation properties for the conditions and the load the cord is carrying? Do you know how to do that?

Also...what the hell is a bridgeport, and what's your job?
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Old 08-08-07, 01:08 AM   #8
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Did you check it had the correct insulation properties for the conditions and the load the cord is carrying? Do you know how to do that?

Also...what the hell is a bridgeport, and what's your job?
Its a milling machine. worked on lots of them but I dont think i would leave it in the wrong rotation that could be dangerous your co worker will not expect it at all.
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Old 08-08-07, 01:13 AM   #9
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Its a milling machine. worked on lots of them but I dont think i would leave it in the wrong rotation that could be dangerous your co worker will not expect it at all.
Yeah, that's very bad practice.

I really don't think you should be wiring if you don't know what you're doing (no offence). It's illegal in New Zealand at least for someone who isn't a registered Electrician to liven work they've done themselves...and this raises an important question: who connected the cord before you, and why did it need replacing?
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Old 08-08-07, 01:31 AM   #10
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Damn you.

I was expecting a menage a tois
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Old 08-08-07, 01:36 AM   #11
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Damn you.

I was expecting a menage a tois
Another thing that can go very wrong if you put the wrong thing in the wrong hole.
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