Motor Assembly

[Alwayslearningelec]

This is a motor assembly in our estimating database. Why would there be lugs as something the EC needs to provide. Don't most all motors have terminals of some sort that the wires land on?

 

[ptonsparky]

Your conductors may need the lugs.

 

[Alwayslearningelec]

Your conductors may need the lugs.

I know lugs are for the conductors just thought they would never be needed when landing within a motor.

What determines if they are needed or not? Don;t want ot have an assembly that always includes lugs. Would rather have some parameter as to when they should be included.

 

[infinity]

What determines if they are needed or not? Don;t want ot have an assembly that always includes lugs. Would rather have some parameter as to when they should be included.

It depends on how you're connecting your field conductors to the motor conductors. Many motors come with ring terminals that you connect to with a screw through a ring terminal lug that you install on the field conductors.

 

[kwired]

I've seen IEC design motors with terminals for landing supply conductors but never or almost never on a NEMA design motor. Leads with crimped on ring terminals is pretty common but is kind of a 50-50 shot they will have them when the motor leads are smaller than ~10 AWG.

 

[Alwayslearningelec]

SOmeone have a picture of ring terminal on motor?

 

[kwired]

SOmeone have a picture of ring terminal on motor?

ring terminal would be something similar to this, size of course would vary with size of lead it is connected to.

 

[Alwayslearningelec]

View attachment 2570960
ring terminal would be something similar to this, size of course would vary with size of lead it is connected to.

Thanks..so waht you were saying above is size #10 or below 50/50 what about larger than #10?

 

[ptonsparky]

Thanks..so waht you were saying above is size #10 or below 50/50 what about larger than #10?

It really depends on the motor mfg. I've seen motors with terminal blocks all the way to bared leads. Including the terminal in the estimate is a good idea.

 

[infinity]

Even if you don't use terminals to make the connection to the motor wires you will need to use something so an allowance in the estimate is necessary. For small motors most guys use wire nuts.

 

[don_resqcapt19]

For most of the motors I connected, the internal motor leads were just bare conductors. A few had ring terminals and some had internal terminal blocks.

We only use ring terminals with screws and nuts to terminate motors, so we would need a total of 13 compression ring terminals for most motors. Nine for the internal motor leads, three for our motor circuit conductors and one for the EGC.

The typical insulation would be 130C tape wrapped sticky side out, followed by 33+tape.

 

[Jraef]

For most of the motors I connected, the internal motor leads were just bare conductors.

And if you are lucky, the wire labels have not fallen off...

Baldor 1HP motor termination box:

 

[Alwayslearningelec]

And if you are lucky, the wire labels have not fallen off...

Baldor 1HP motor termination box:

That's a lot of different color wires? What are they for?

 

[Alwayslearningelec]

For most of the motors I connected, the internal motor leads were just bare conductors. A few had ring terminals and some had internal terminal blocks.

We only use ring terminals with screws and nuts to terminate motors, so we would need a total of 13 compression ring terminals for most motors. Nine for the internal motor leads, three for our motor circuit conductors and one for the EGC.

The typical insulation would be 130C tape wrapped sticky side out, followed by 33+tape.

I didn't know that. What would'nt a motor just get the hots/neutral/ground wires?

 

[Alwayslearningelec]

So a motor could come with or without these ring terminal on the leads?

 

[infinity]

So a motor could come with or without these ring terminal on the leads?

View attachment 2570976

Yes they may come with those crimped on ring terminals. Most guys cut them off.

 

[ptonsparky]

That's a lot of different color wires? What are they for?

Dual voltage three phase motor leads labeled 1-9. This mfg happens to use colors as well.