How JustAnswer Works:
  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site.
    Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.
Ask Steve G. Your Own Question
Steve G.
Steve G., Electrical Engineer
Category: Electrical
Satisfied Customers: 17986
Experience:  Spent 20 years as an Electrical Engineer, designing electrical plans and specifications.
Type Your Electrical Question Here...
Steve G. is online now
A new question is answered every 9 seconds

p1 and p2 thermostat leads on electric motor do you have use

This answer was rated:

p1 and p2 thermostat leads on electric motor do you have use them to make the motor work

Hi and welcome to Just Answer. My name is XXXXX XXXXX I will be assisting you today. I have over 30 years of electrical and electronic training and repair experience. I will try and answer you question accurately and precisely.

How do you plan to control the motor?

Customer: replied 4 years ago.

480 volts 3phase

Sorry, my fault for not being clearer....I mean how do you plan to turn it on and off, and control the speed?


Customer: replied 4 years ago.

state and stop button on control box, I am just replacing a old motor
that has no p1 or p2 leads and control box is like 30 feet away from

motor and this motor is not new

Put a meter across P1 and P2 (measuring ohms). Is it open or closed?

Customer: replied 4 years ago.


Customer: replied 4 years ago.

it is closed.

Ok, so ideally, what you need to do is wire P1 and P2 into your control circuit so that if it becomes 'open' by the action of the thermostat inside the motor, it will shut down the motor.

Like this:

Leaving them capped off will not prevent you from running the motor but you will have no thermal protection. If this is not an issue for you, cap them off and ignore them. My advice would be to include the thermal switch in your circuit.

I'll be here if you need further help. Please do not hesitate to ask. I'll respond as quick as I can. I want you to be completely satisfied with my service today.



Customer: replied 4 years ago.

Would it be the same as the old motor was no p1 and p2

How many leads come from your new motor? How many leads came from your old motor?

Is everything EXACTLY the same except for the P1 and P2? If so, just hook the motor up as before.


Steve G. and 3 other Electrical Specialists are ready to help you