Home |
Search |
Today's Posts |
|
Metalworking (rec.crafts.metalworking) Discuss various aspects of working with metal, such as machining, welding, metal joining, screwing, casting, hardening/tempering, blacksmithing/forging, spinning and hammer work, sheet metal work. |
|
LinkBack | Thread Tools | Display Modes |
#1
Posted to rec.crafts.metalworking
|
|||
|
|||
Three phase wiring question
I'm doing some work in an older factory - MANY electricians have had their hands in this place. They called me today with a problem:
They have a piece of equipment they have been moving from room to room. It has a 3-phase 230V motor (about 1 HP). In some rooms it runs backwards, so they have been swapping wires inside the motor junction box. They asked me whether I could add a reversing switch, with a lockout to prevent it from switching while it's running. Well, yes I could do that, but why don't they just rewire the outlets so they're all the same? Well they think that's a great idea. And I should go up there and make sure they do it right. So, I COULD identify the correct wiring by simply by plugging in the motor and checking for correct rotation, but surely there's a better way? What if this was a big piece of equipment, or something that would do damage if the motor turned the wrong way? I COULD hook up my oscilloscope (and it always impresses the hell out of them when I pull that out), but is there an even better way? How do "real" electricians identify the phase connections when they can't count on the wire colors? [just to get back on the off topic] How would Bernie, Hillary and Donald do it? How would they do it in Oregon? |
Thread Tools | Search this Thread |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Forum | |||
3 phase motor wiring question | Metalworking | |||
profit-motive question: single phase adapter for 3-phase motor drives | Metalworking | |||
3 phase wiring | UK diy | |||
Wiring 3 phase switch for 2 phase power | Metalworking | |||
wiring a 3 phase compressor motor question | Metalworking |