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Wiring problem I need a wiring diagram to show me how to control a 3 phase motor 208 volts with two low voltage swithes.

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    CESAR QUANT Mar 09, 2009



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I am an electrician and can send you a drawing if you sign up for a free email account with like gmail or hot mail and give me the address I can send you a schematic.

Posted on Nov 19, 2008

  • Scott Jelt
    Scott Jelt Dec 02, 2008

    Did you need a schematic yet? I don't know how you would like me to get you a drawing. I have the drawing I just need a way to get it to you.


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Unable to get 240 from the two hot leads. I can get 120V from each lead to the ground. I am using 2 wire with ground 8-2 wiring.

Measure the voltage across the two hot leads. if it is at least 208 volts that is considered 240 volts. If it is not at least 208 then you are not connected to both phases at the breaker/fuse box assuming you have two phases in the box. With the cover off of the breaker panel, look near the top for two LARGE GUAGE cables. Eack will be connected to a seperate POWER BUSS. If that is what you find then when your wires are connected one each to a two pole Breaker you will have designated 240V power.

Apr 12, 2015 | Light Switches & Dimmers

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Wiring a dimmer switch with 208vac, single pole

208 Volt 2-wire is generally achieved by pulling two hot wires off 3-phase 120/208 Wye or 208 Delta, or Highleg to center tap off high leg delta.

Since each of these three phase systems also offers 120volt for lights, and a dimmer can be used for lights, then I wonder what you are using dimmer for?

208 volts.can be controlled by turning off one hot of the two hot wires.
Install dimmer on one of the hot wires, and see what happens.
Is the dimmer rated for 208 volts?

Add a comment and say what you discover.

Jan 03, 2013 | Generac HTSN400G 400Amp HTS 3ph 120/208V...

1 Answer

Just intstalled a T104M according to the diagram and all the diagrams found on the web. The clock timer doesn't work. I can manually shut off the pump from the timer. I thought it was a bad tim

T104M is 208-277 timer mechanism that fits inside any Intermatic enclosure.
If voltage is not correct, then clock motor will not operate.
Since you did not say what voltage, I assume you have 240Volt pool pump.
Open following link to see the many ways to wire this timer:
It is possible that you have the Load and Line wires reversed.
Line wire come from circuit breaker, and Load wires go to pump.

If the T104M mechanism is part of a control panel with more than one timer, and/or a freeze control, then re-post question with more specific information.

Jun 23, 2012 | Intermatic T104 24h 208-277v Mechanical...

1 Answer

2 speed switch wiring dieagram

The motor will have wiring diagram and voltage on nameplate.
You can re-post question with information that shows on nameplate for more exact information, or keep reading below:
If motor is rated for 240Volts, then it will not work with 120V.
If motor is rated for both 120V and 240V, then either Low voltage or high voltage will work, and one wire will be common, and 1 wire will for 120 and other wire for 240.
If motor is rated 120Volt two speed, then one wire will be neutral, and 1 wire low speed, and other wire high speed. You can connect your wire to either low of high, and cap other wire.
If motor is 240volt two speed, then one wire will be common, and 1 wire low speed, and other wire high speed.
If motor is rated 3-phase, then all three wires are connected to the voltage shown on nameplate.
If motor is rated 3-phase two speed, you may need electrician to wire the motor correctly.

Jun 08, 2012 | Westinghouse Electric Westinghouse...

1 Answer

Need wiring diagram for T104M 208-277v Mech. Time Time Switch

Here is the basic instructions:

Below is a larger and better diagram of a 240V connection Terminal connections are White to White on 3 & 4 Black to Black on 1 & 2:

More info:

I am assuming you have the 240 VAC clock motor so the clock timer motor wires are connected to terminals 1 and 3.

If you only have the 120 VAC clock motor the wires will be connected across terminals 1 and 2.
Thanks for choosing FixYa,

Jun 27, 2011 | Intermatic T104 24h 208-277v Mechanical...

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1/3 Hp 115 volt 24 year old motor 40 amps. single Phase. is this for 110 volt Plug in to wall.It also 3 wires , Orange,Red, White, were do i hook these up to on a 110 Plug. Can you Please help.

You looked at nameplate on motor to get the rating information?
Rating plate may also have small wiring diagram.

I was looking at AO Smith single-phase 2-speed pool pump motors yesterday.
The rating plates show wiring.
Open following link:

Notice the image shows the words: Brown White Line Line.
Brown and white are wire colors. Line means 'power' from breaker box.
240V will have two Line wires, L1 and L2. 115Volt will have Line or L1 and N or Neutral.
Look at your rating plate and then add a comment with clear description of what appears on rating plate, or include in-focus photo. Put your camera in macro to take close-ups.

Your wall outlet has 2 plug-in slots. One is wider that the other.
'Line' will refer to Hot wire from breaker which corresponds to smaller slot on outlet.
'N' or 'Neutral' is neutral wire from breaker box which corresponds to wider slot on outlet.

Apr 30, 2011 | Light Switches & Dimmers

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I have a intermatic model # T7402B that I'm getting ready to install and I'm a little confuse on how to install the power to the motor clock it shows a letter A is this for power supply and I assume that...

I'm not 100% familiar with 3 phase 277V.

T7402B manual shows clock is 208-277
T7402B > the manual does not specify terminal A or B.
On other Intermatic timers, Neutral goes to A and then Hot wire connects to B
Load terminals are wired separately and carry up to 40Amp

Add a comment for more free help.
Also take advantage of fixya expert assistance live.
For a price, expert works with you via e-mail while you work on timer or any do-it-yourself project.
Fixya is always less expensive than a service call.

Feb 17, 2011 | Intermatic T104 24h 208-277v Mechanical...

1 Answer

I wired my replacement switch the same as the old one, it seems to shut off and on fine. but it does not keep time, only turns on and off manually. it had no instructions in the box. anyone that kn ows a...

Re-check your wiring. The 2 incoming 240 volt wires from the circuit breaker connect to terminals 1 and 3. The 2 outgoing 240 volt wires going to the load connect to terminals 2 and 4. If it is connected any other way you will get symptoms such as you describe.

The 240 volt timer clock motor is connected internally to terminals 1 and 3, so if you connected the incoming 240 volt wires to say, terminals 1 and 2, then the clock motor is only getting 120 volts. If you inadvertently connected the incoming 240 volt wires to terminals 2 and 4, then the timer clock motor is getting no voltage.

In both cases of mis-wiring stated above, the timer clock motor will start running when the manual lever is in the ON position, and of course, the load will then turn ON.

Sep 19, 2010 | Intermatic T104 24h 208-277v Mechanical...

1 Answer

How does one wire the T104. Can the T104 be wired via a 120 volt, 20 Amp Breaker Supply

No, the Intermatic T104 requires 240 volts for the clock motor.

The T103 has a 120 volt clock motor and will control a 240 volt load, but requires a 3-wire (with ground) supply cable [as opposed to only a required 2-wire (with ground) for the T104].

The T101 uses a 120 volt clock motor and controls 120 volt loads.
This tip may help:

Aug 23, 2010 | Intermatic T104 24h 208-277v Mechanical...

1 Answer

Trying to wire up a single phase transfomer, 480 step down to 208


Oct 16, 2009 | Acme 1000-Watt Transformer with Dual...

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