Question about Intermatic Inc. ST01C Digital In-Wall Timer

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I have two wires and a ground on my existing switch. The wall timer has three wires and a ground. how do I wire?

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Open following page for correct wiring of GE in-wall timers, and for list of timers used for 3-way.
Same wiring steps are used for almost all in-wall timers <> except those used for 3-way.
http://waterheatertimer.org/GE-timers-and-manuals.html#15071

If you are wiring Aube timer for 3-way, add a comment with brand and model number.
http://waterheatertimer.org/Aube-timers.html

For other timers, add a comment with in-focus photo of your timer for correct identification and possible assistance.
http://www.fixya.com/support/r6568559-post_photograph_fixya_questions_answers

Add a comment for more free help

Also take advantage of fixya expert assistance live.
For a price, expert works with you while you work on timer or any do-it-yourself project.
Fixya is always less expensive than a service call.

Posted on Apr 22, 2011

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Im trying to install a Utilitech 0192773 self adjusting wall timer. It has four wires, black(hot), red(hot), white(neutral) and green(ground). I have a standard three light switch plate(outside light,entry...


Thank you for clear description of wiring, switches, and for including timer model number.

1) Open following link for ez programming and wiring for Utilitec.
http://waterheatertimer.org/Program-wire-Utilitec-0192773.html

2) Your single-pole switch has 2 wires.
0192773 replaces single-pole switch only.
Black wire that connects each of the switches is Hot wire: connect this wire to timer Black wire.
Other black wire that connects to switch goes to load: connect this wire to timer red wire.
Timer white wire connects to white wires that are covered with wire nut.
Timer green connects to bare ground wire.

3) How to connect stranded wire and solid wire
http://waterheatertimer.org/How-to-twist-electric-wire.html#stranded

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Sep 03, 2011 | Intermatic & Self-Adjusting Wall Switch...

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I have tried to install the Utilitech timer but am having trouble. I have a ground, black, and red wire that were previously wired to a switch that controlled my outdoor garage lights. I tried to hook red...


Sounds like this was probably a three-way switch you are replacing as there is no neutral (white) wire in the box. If so, you can splice the white wire to the green wire in other three-way switch box; then hook the green wire in the box you are placing the timer to the white wire of the Utilitech timer.

Apr 17, 2011 | Intermatic & Self-Adjusting Wall Switch...

1 Answer

I am trying to wire a timer switch in a four gang outlet box and the timer switchhas a red, black, white, and green wire. The existing switches in the box are all wired with two black wires and one copper...


Your switch has two black wires.
One of these wires goes to Load (light fan motor)
The other wire is hot. And this wire probably connects back to other switches in box making it easy to identify.

Timer-black wire goes to hot wire.
Timer-red wire goes to Load wire.

Timer green wire goes to bare ground wire.

Timer white wire runs the clock located inside timer. So timer clock is just like alarm clock, and needs its own power.
In back of 4-gang box are white wires that are twisted together and covered with wire nut.
These are neutral wires.
Timer-white wire connects to neutrals, and this completes clock circuit.

Dec 07, 2010 | Intermatic Inc. EJ500C Digital Wall Switch...

1 Answer

Installing a 7 day digital wall timer


Swylite LST100 timer has 4 wires. Red, Blue, Black, White
Timer has more wires than wall switch because timer has electric clock inside. And with + series Swylite timer, it also has led bulb that needs power.

Timer can replace ordinary on-off switch
-On-off switch has 2 screws, so 2 wires (plus ground wire) connect to on-off switch
-Three of the four timer wires are used when replacing on-off switch
-Red wire is not used, it is capped off

Timer can replace 3-way switch
-Three way switch has 3 screws, so 3 wires (plus ground wire) connect to 3-way switch
-One of the screws on 3-way switch is colored dark (it is crucial to identify the wire that comes off dark screw so timer can be wired correctly)

Lets replace on-off switch see diagram
Timer black goes to Hot wire
Timer blue goes to Load (light, fan, motor)
Timer white goes to Neutral
Timer red is capped off.

How to check which wire is Hot, Neutral and Load
Switch you are replacing has 2 wires > one is Hot, the other goes to Load
Remove these two wires. Separate wires so you can test. Turn on power. Tape tester leads to wood sticks so hands are away from power. Test each wire to bare copper wire.
When tester lights up >> that is Hot wire >> please connect this wire to Timer black wire
The other wire goes to Load >> please connect this wire to Timer blue wire.
Now test for Neutral. Test Hot wire to other wires inside box. Neutral should be white. When tester lights up, that is Neutral. Please connect Timer white wire to neutral. IF YOU DO NOT have a neutral, you can connect Timer white to bare ground wire until you have time to drop a Neutral into the box.

Replace a 3-way switch see diagram
Three-way switch has 3 wires.
Identify which wire connects to Dark screw on switch >> and then please connect this wire to Timer Black wire.
Timer white wire connects to Neutral
Timer blue and red wires connect to other two wires that came off switch ... they connect to either one.

Oct 01, 2010 | Solar Ivory Swylite Lst100+ Back-lit...

1 Answer

I have an ST01 timer that I want to place in a three way circuit that appears to be different than that shown in the directions. My circuit has power (black/white/ground) coming into switch 1 with a three...


One caveat of most In-Wall electronic switches/timers is that the device _must_ be installed at the switch box that has the power, in your case switch #1. In order to install it at switch #2, in your case, you need an extra wire between the switches (to carry the HOT wire), and unfortunately, the bare ground(ing) wire is not permitted to be used to carry current per National Electric Code (NEC).

In your case the wiring for the ST01 is as follows:

Switch box #1: Connect the incoming White wire to the White wire in the 3-wire cable that goes to switch box #2. Connect the incoming (Black) HOT wire to the Black wire on the switch/timer. Connect the Red wire in the 3-wire cable to the Red wire on the switch/timer. Connect the Black wire in the 3-wire cable to the blue wire on the switch/timer. Connect the green wire on the switch/timer to the 2 bare ground(ing) wires. If you have a metal box this connection should also have a pigtail that connects to the box with a green ground screw.

Switch box #2: Remove all of the existing wires from the 3-way switch. The three-way switch will have 2 screws the same color (usually black) and 1 screw (usually brass). For this scenario, one of the black screws will _not_ be used.

Connect the Black wire in the 3-wire cable coming from switch #1, the Black wire going to the lights, and a short Black pigtail together under one wirenut. The pigtail is then connected to the brass screw on the 3-way switch. The Red wire in the 3-wire cable coming from switch #1 is connected to one of the 2 black screws on the 3-way switch (pick one).

In effect you are installing a single switch at switch box #2. In fact, you can use a regular single pole switch if you want too.

To finish, connect the White wire in the 3-wire cable coming from switch #1 to the White wire going to the lights.

Grounding is the same as switch #1 except you'll need a pigtail to connect to the green screw on the 3-way switch.

That's it. You may want to check the battery compartment in the switch/timer, as sometimes they put in a pullout plastic tab to keep it from being energized until needed.

Now, the E1210 is a different animal, and can only be used to replace a single pole switch. You could use it by basically passing the power through to switch box #2 from switch box #1 and then cover switch box #1 with a blank plate. The ST01 could be used that way too, in which case the black on the device connects to the hot, the blue to the lights, and the red on the device is not used, nor will the Red wire in the 3-wire cable between the switch boxes be used.

Sep 11, 2010 | Intermatic EI210 Electronic Auto Shutoff...

1 Answer

I have purchased a Utilitech 7-day digital In-Wall timer and I cannot seem to install it properly. Step 2 of the instructions states that if "hot" and neutral wiring is not present you may need to add...


What you have a single pole light switch you are replacing with the timer. As you say you have 2 black wires. One black wire is the incoming power wire and the other black wire goes up to the light. On a normal single pole switch is makes no difference which of the screws you connect it to. Of course with the exception of the ground screw. Tie all the white wires back together that are in the wall box and shove them to the rear as they are not needed to make this connection. The correct connection is to connect one of the black existing black wires in the wall switch box to the black wire on the timer. Now connect the other black wire to the blue wire on the timer. The red wire is not used in a single pole connection and is only used in a 3 way switch connection, so just put a twist connector on it and shove it back in the box. To recap, connect black wire on timer to either black wire in box. Connect the other blue wire to the other black wire. Do not use the red wire. Hopefully you did not hurt the timer by connecting it incorrectly. If it does not work after setting the timer up according to the instructions you have ruined the timer by wiring it incorrectly. Hopefully no damage has been done.

Aug 14, 2010 | Intermatic Inc. ST01C Digital In-Wall...

1 Answer

Can this timer be used in an "old" house where there are only 2 wires available, i.e., there is no "neutral" wire in the existing circuit?


You do have a neutral wire you do not have a seperate ground

Connect the ground lead from the switch to the box frame it should work fine

Mar 08, 2010 | Intermatic KM2ST-1G - 24 Hr. In-Wall...

1 Answer

I have 4 wires on wall switch red, white, black, and cooper (ground) and only 2 black wires on the ej351c timer. How do I wire this timer?


It appears that you should have an ej353 instead of the ej351c. If the switch that you are removing has a red, white, black and copper wire on it, it sounds like you are replacing a 3 way switch. The model ej351c switch is made for a single pole switch and not a three way switch. You can find additional information on how to wire your switch at: http://ec-images.acehardwareoutlet.com/shared/productmanuals/30088manual.pdf

Nov 22, 2009 | Intermatic Programmable 24 Wall Switch...

1 Answer

Installing timer on existing electrical outlet


Are the wires different colors or is there too many of one and not enough of the other. Your bathroom switch should have black which is hot, white which is neutral, and green or bare which is ground. It should be the same on the timer, but may differ. The instructions should tell which wire or terminal is hot, neutral and ground.

Sep 10, 2008 | Hardware & Accessories

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