Question about Intermatic Inc. EJ500C Digital Wall Switch Timer - Self-Adjusting Feature

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Trying to install a ge digital time switch. all i have is a white black and ground wire. the diagram on instructions would be more helpful if it said ground, white, and black instead of to power supply and to load. the timer itself has a connection for the timer, NC, NO,COM,NC2, NO2, AND COM2. SO where does the white go and where does the black go? I know the answer should be easy but it just doesn't seem clear.

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  • Ashley May 11, 2010

    Did you get an answer? I am having the same problem?

  • John Morganti May 11, 2010

    Connect Black (power supply) wire to COM (common). Connect White (load) wire to NO (normally open). Ground wire connects to a green screw or wire if there is one. If not then install the ground wire on the mounting screw so it is in contact with the metal mounting bracket.

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I just installed this thing yesterday and it was a PITA. ecupirate988's post was useful but I needed more.

NO is "Normally Open", meaning that whatever is plugged into COM (not necessarily what's plugged into TIMER, but could be) will get power. NC is "Normally Closed", meaning that when the switch is off, this will get power. The NO2, NC2 and COM2 lets you have 2 different voltages going through the same switch.

To wire this thing like simple wall switch, put the incoming hot (black) into the left side of "TIMER" and put the neutral (white) into the right side of "TIMER". Then with a second 6-8" wire, take of the sheathing so you have an 8" black, white and bare/green wire. Throw away the bare/green wire & the sheathing. Plug the black into the other side of the screw your first black went into (TIMER [LEFT]) and the other side into COM. Then plug the white into the other side of the screw your first wire went into and use a nut to connect it to the white (neutral) of your light. Connect the black of your light into NO1 and.

That worked great for me. Took a lot of work with a voltmeter & some learning on Wikipedia to figure out exactly what I was doing. It's a nice switch once you get it wired.

Ryan

Posted on Jan 24, 2011

  • lord_zex Jan 24, 2011

    This took me forever to figure it out. NC is "Normally Closed" and NO is "Normally Open". To wire this thing like a regular wall switch, wire your incoming (line) hot wire (black) into the left side of TIMER. Connect the neutral (white) into the right side of TIMER. Then take a second 8" strip of wire (not included) and take the sheathing off. Throw away the sheathing and the ground (bare/green). Hook the black to the other side of the same screw you plugged your incoming hot/black into and put the other side into COM1. Plug the light's black into NO1. Put one side of the new 8" white wire into the other side of the screw you put your incoming white into (TIMER [right]) and the other side should be joined to the lamp's white with a nut. Now it should work.

    Thanks ecupirate988, your post got me 20% of the way there. I had to play with my voltmeter a lot to figure it out. Wikipedia's article on "switch" helped a lot too.

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I am trying to install a ge digital timer (model 15086) for a porch light. I have one black wire and one white wire coming from the wall. The timer has a white, black, red and green wire. How do I procede?


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I am installing a ge #15070 basic timer and there are 3 wires. Which wire do I attach to the ground?


GE 15070 timer does not have ground wire.
I assume this timer is double insulated, just like some power tools and electronics only have two prong plug.
Leave bare ground wire attached to other bare grounds in the box, and shove grounds to back of box.
I have one of these timers installed.
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http://waterheatertimer.org/GE-timers-and-manuals.html#15070

How to wire GE 15070 timer:
1) Switch has 2 insulated wires. Take switch wires and connect them to timer-black-wire and timer-red-wire. Choose either one for now.
2) In back of electric box are white wires twisted together and covered with wire nut. Connect timer-white to these wires.
3) If electric box does not have white wires described above, then connect timer-white to bare ground, along with timer-green wire.
4) Turn on electricity, and slide switch to ON-or-OFF. If lights come on, timer is wired correctly. If lights do not come on, then reverse timer-red and timer-black wires.

5) Add a comment for more free help.
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I test these timers.
GE 15071 timer has internal clock that runs on electricity. That's why timer has extra wire.
Intermatic, GE, Tork, Leviton, Sylvania, Woods, Utilitec etc in-wall timers each wire the same way.
The only tiny difference is GE doesn't have green ground wire.
http://waterheatertimer.org/Program-wire-Utilitec-0192773.html

Here's what to do:
1) Old switch has two screws (excluding green ground screw)
One screw on old switch has 2 black wires >> these are hot wires > timer black wire connects to these hot wires. This will power the timer.
2) The other switch wire connects to timer red wire. This will send timer signal to lights.

3) Timer white wire is for the timer clock.
Timer white wire connects to other white wires that are twisted together and covered with wire nut >>> these are neutral wires, and now timer clock will operate
4) For EZ connection to other white wires, strip back another inch on timer white wire so stranded wire can wrap like a candy cane around solid copper wires. Then twist wire nut on very tight.

5) When wiring is complete, push door on timer for manual override. Lights should turn ON-OFF. If lights do not turn on, reverse timer red and timer black wires. Make sure outdoor bulbs are working.

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See instructions along with image at following link:
http://waterheatertimer.org/Program-wire-Utilitec-0192773.html

Heres how to wire timer

1) Timer-green-wire connects to bare ground wire.
2) Switch has 2 wires. Take switch wires and connect them to timer-black-wire and timer-red-wire. Choose either one for now.
3) In back of electric box are white wires twisted together and covered with wire nut. Connect timer-white to these wires.
4) If electric box does not have white wires described above, then connect timer-white to bare ground, along with timer-green wire.
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If I understand correctly, the old timer has 2 wires. One of these wires is the Hot wire ... and that wire will connect to GE timer black wire.
The other wire from old timer goes to Load ... and that wire will go to GE timer red wire.

Instructions on a lot of these timers say, it timer doesn't work, then reverse the two wires described above ... this is because timer only works when Timer black connects to Hot.

You can also turn on power and test each wire that came off old switch to bare ground wire. When tester lights up, that is Hot wire.

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Review:
Black goes to Hot wire from breaker box
Red wire goes to Load (light, fan, motor)
White wire goes to Neutral
Green to bare copper ground wire

Orientation:
Your original switch had 2 wires plus bare ground.
One of these wires is Hot, the other goes to Load.
You said original wires are Red and Black

How do you find Hot wire?
-Your original switch had 2 wires.
-Remove timer from box.
-Pull original 2 wires out where you can test them
-Turn on power
-Use regular tester
-Tape tester leads to wood sticks so your hands stay away from voltage
-Power is on
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- The other wire goes to Load so it connects to Red wire on timer

How to test for Neutral wire
Test Hot wire to your white wires - No need to untwist them.
When tester lights up, that is Neutral
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