Elementary motor wiring 2

[insideman]

I have a confidential project involving a 2hp 3 phase motor.
The motor will be inside a fiberglass housing. What type of wire must I use inside the housing? Must I have a junction box where the wires terminate?

My concern is based on the fear that thre will not be enough room to run heavy cable in the not-too-big interior.

 

[NEWFIEBOY]

Hello insideman
what is your voltage supply? 230, 460 etc.

 

[insideman]

Thanks for responding. 230/460 volts.

 

[petronila]

Hello Insideman,

One 3 Phase 2 HP Squirrell Cage Motor will drawn at 230 Volts 6.8 Amperes at Full load. Normally this small motors use Y or 2Y, Then you will need only four wires, 3 for phase and 1 for earthing. Use 4 wires EXAR 3562 AWG 22 -600 volts Class F(150 Grades C),manufactured by CHAMPLAIN CABLE.I don´t think you need the junction box because you could open a small hole on the fiber glass housing and pass the power wires from outdoor to indoor housing and then connect with the motor, I think you could remove the motor´s conection box.The housing hole can be sealed and closed with Silicone compound.

Regards

Petronila

 

[54494060]

Insideman, I'm not sure I understand your particular configuration (fiberglass housing) and your statement "heavy cable" but will try to give a suggestion. Corrections Welcome?
Large cables lead me to assume that there may be voltage drop "distance from the 3ph 230/480 volt source". If this is the case you could install a Junction Box some where close to/on the outside of the (fiberglass housing). At that point you could use 1/2in. flex to your motor connection box and use smaller single conductors (#14Awg) for your connection at the Motor. Again I'm not sure of your particular configuration but I don't think you would want an installation with out installing some type of raceway (Flex/Conduit) for your Motor supply cables/conductors. !! SAFETY!!

Again, Corrections Welcome
12Fish

 

[insideman]

Thanks for the help. Both of you have given me valuable tips. I must check the cable reccommended to make sure it can be wiggled into place without too much swearing.

 

[waross]

Motors tend to overheat when the ventilation is restricted by things like close fitting fiberglass boxes.
yours

 

[NEWFIEBOY]

I agree with waross, some consideration should be given to the ventilation requirements of the motor. If air flow is restricted the motor will most likly over heat. Also, depending where you live or where this unit will be used, there may be some electrical code requirements which need to be addressed.

 

[insideman]

Ventilation is taken casre of nicely.