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How to wire GE 15312 Sunsmart timer/ Single pole & 3-way

Buy GE 15312/ CFL ready:
15312 at Amazon
Resources:
GE 15312 manual
GE 15312 wiring manual
All GE timers and Manuals

Single pole starts here

GE 15312 timer wiring Wire GE 15312 timer Single-pole box has neutral
Power wire arrives in box
Wire goes to light

Timer Black connects to Hot wire
Timer Blue connects to Load wire
Timer White to Neutral
Timer Green to ground
Timer Red is always capped with single-pole install

If timer does not work after power is turned ON, try reversing Timer Black and Timer Blue wires


12-2 wire

Larger image

Larger image
How to wire so timer controls BOTH light and outlet
Single-pole switch installed in junction box.
Junction box always has Neutral wire.

Black hot wire enters junction box.
Illustration shows both black wires connect to switch: Hot connects to switch, and Black going to next box connects to switch.

Timer Black connects to Hot wire & other black wire
Timer Blue connects to Load wire
Timer White to Neutral
Timer Green to ground
Timer Red is always capped with single-pole install
Wire GE 15312 timer



Do not use this wiring diagram... Install Intermatic ST01 instead.
This wiring is against National electric code, and manufacturer does not recommend. Using ground wire as Neutral can be potentially dangerous.
If Box does NOT have neutral, then do NOT use GE 15312
Use Intermatic ST01C timer instead (shown below)
Power wire arrives at light
Wire goes to switch

Black connects to Hot wire
Blue connects to Load wire
White to ground is violation of national electical code (NEC)
Green to ground
Red is always capped with single-pole install

If timer does not work after power is turned ON, try reversing Timer Black and Timer Blue wires
Use Intermatic ST01 when box does not have neutral wire
ST01C wiring
Box does NOT have neutral/ then use Intermatic ST01 timer

Alternative timer to GE 15312:
Buy:
Intermatic ST01c timer at Amazon
Intermatic ST01 timer
CR2 replacement battery at Amazon
CFL bulbs at Amazon
If box does not have Neutral or ground wire.
Use Intermatic ST01C
ST01C is battery operated and does not need either Neutral or ground wires to operate light
Read more about ST01C
Same Load rating as 15312
CFL, LED, motor loads etc.
Same single-pole or 3-way, same Dawn-dusk or programmable

If timer does not work after power is turned ON, try reversing Timer Black and Timer Blue wires
CFL ready
GE 15312 timer.
Rated 15 amp for CFL, LED, Incandescent, Motors, etc.
Up to 100' away

Reverse dawn-dusk operation to dusk-dawn

GE 15312 timer has astronomic function to turn Lights ON at dusk and OFF at Dawn.
To reverse operation, connect timer red and blue wires.
If you want dawn-to-dusk operation instead of dusk-to-dawn, then connect red wire to blue wire.

This action will reverse timer operation
GE 15312 timer ciontrols water heater
If neutral wire is not present, Use ST01c Timer
ground wire not shown

GE 15312 timer
GE 15312 rated for incandescent, CFL, LED, halogen, motors, etc.
Use GE 15312 timer to control 120Volt pump
Timer is rated for 15amp. Maximum 100' distance.
15312 timer requires neutral wire, so timer can control 240 Volt loads if Neutral wire also present.
Use ST01C timer to control 240Volt loads without using neutral wire. See ST01C
120Volt load can be controlled directly by timer, or install contactor as shown.
Contactor is preferred method of switching heavy motor loads

Use illustrated wiring to control pumps or any large amp load that exceeds timer rating.

Must add 15 amp busman line fuse to protect timer if circuit breaker exceeds 20 amp. See illustration
In-line fuse will protect timer. Select fast acting, or delay fuse

Resources
Fuseholder
Contactors
Terminals
Buy fuseholder:
Buy fuseholder at Amazon
Buy fuseholders at Amazon
Some fuseholders accept terminal connections, some have solder-only connections. Fuse block has screw terminals.

How to wire GE 15312 timer/ 3-way

With Neutral wire -and- without Neutral wire
If your 3-way switches do not have Neutral wire, then one box will have only 3 wires (plus bare ground wire)
Illustration shows typical 3-way switching with Neutral wire

GE 15312 will replace 1 of the 3-way switches.
Remaining 3-way switch must be re-wired as shown below.
Or replace remaining 3-way switch with ordinary single-pole switch.

Illustration shows LINE side and LOAD side
Line means the wire that comes from breaker box.
Load means the wire that goes to lights
3-way switch
Identify wire that connects to common screw.
Disconnect this wire from switch. Isolate this wire for testing.
Turn power ON. Tape tester leads to wood sticks.
Test wire to bare ground wire.
If wire tests Hot, then this is Line side Hot wire that connects to Black wire on timer.
If wire does not test Hot, then this is Load side wire that connects to Blue wire on timer.
Typical 3-way switch wiring

Common screw is dark-colored
Traveler-screws are brass colored
Line side connects to line from breaker
Load side connects to light

12-2 wire
Wire from breaker has Black Hot wire and white neutral wire
3-way switch
Common screw is usually dark.
Timer replaces one 3-way switch
Other 3-way must be rewired

Three wires + ground wire travel between switches
Remaining 3-way switch is rewired
Replace LINE side switch with timer

Timer Black wire must always connect to Hot from breaker.
Timer Blue must always connect to Load wire.
Timer White wire must be connected to neutral wire, to power timer clock.

Neutral wires are white, and are generally covered with wire nut and shoved to back of box.

Timer Red wire is for reversing timer operation. When timer red wire receives voltage, the timer programming is reversed and ON becomes OFF, and OFF becomes ON

Three wires + ground wire travel between switches
Remaining 3-way switch is rewired
Replace LOAD side switch with timer

Timer Black wire must always connect to Hot from breaker.
Timer Blue must always connect to Load wire.
Timer White wire must be connected to neutral wire, to power timer clock.

Neutral wires are white, and are generally covered with wire nut and shoved to back of box.

No Neutral wire 3-way switches

One box will have only 3 wires
3-way switches with NO Neutral
Wire colors can be different.

Look for: one of the two boxes will have ONLY 3 wires (plus ground wire).
If one of the 3-way boxes has just 3 wires, then use the following wiring diagrams.
Must have ground wire for GE 15312 timer to work for this installation.

What if no neutral and no ground wire?
With No Neutral and No Ground, then use Intermatic ST01C timer and use same illustrations shown on this page except ST01c timer does not have white wire.
See ST01C
wire GE 15312 timer Replace Line side switch with NO Neutral
Wires can be different color than illustration
Look for: Line side Box has 5 wires. Other box has only 3 wires. (plus ground)

Timer Black connects to Hot wire that was connected to dark-colored screw
Timer white wire connects to bare ground wire, along with timer green wire.
Timer Blue wire connects to wire going to light

Red connects to red traveller
Black traveller is capped off
wire GE 15312 timer Replace Load side switch with NO Neutral
Use Intermatic ST01 timer when line side box does not have neutral wire (shown below)
Wires can be different color than illustration
Look for: Load side Box has 3 wires. (plus ground)

Timer Black connects to Hot wire that enters Line side box.
Timer Black wire must connect to Hot wire so timer has power, otherwise timer will not operate.
Timer white wire connects to bare ground wire, along with timer green wire.
If box does not have Neutral wire or bare ground wire, then use Intermatic ST01C timer.
Timer Blue wire connects to wire going to light, and joins wire from Line side switch

Red connects to red traveller that connects to line side switch
When line switch is moved up-down, this action will connect or disconnect power to timer Red wire.
When power is connected to Red wire, the timer scheduled operation reverses.
When power is disconnected from Red wire, timer resumes scheduled operation.
Use Intermatic ST01 timer when line side box does not have neutral wire
Wires can be different color than illustration
Look for: Load side Box has 3 wires. (plus ground)
If box does not have Neutral or ground wire.
Use Intermatic ST01C

Buy:
Intermatic ST01c timer at Amazon
Intermatic ST01 timer
CR2 replacement battery at Amazon
CFL bulbs at Amazon
Test wiresOne cable has 3 wires, one has 2 wires Identify wires inside 3-way switch box

3-way switch box will have minimum 3 wires.
 
Most 3-way boxes will have 5 wires (plus ground wires).
Other 3-way boxes can have 7 wires, or more depending on number of junctions connected inside the box.

Illustration shows typical 3-way switch box.
Two cables enter box.
One cable has 3 wires plus ground
Second cable has 2 wires plus ground
Find HOT wire

Each 120Volt electrical box inside residential home has 1 black hot wire > except for 3-way and 4-way switches, and 240volt outlets fround on clothes dryer etc.

To find the hot wire:
Take photo image so wires can be put back.

Remove both 3 ways switches.
Mark each wire that connects to common screw on 3-way switch. Hot wire will always connect to common screw.

Separate all wires for testing.
Leave ground wires together
Tape tester leads to wood sticks for safety.
Turn power ON. Keep hands away. Stand on dry boards.
Test each wire inside box to bare ground wire.
Tester will light up on one wire.
This is the Hot wire.

Next test Hot wire to all other wires inside box except bare ground.
Tester will light up on Neutral.

More Residential wiring

Additional links:
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What is 3-phase

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How to install electric meter on water heater
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6x6x4 Enclosures
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How to wire Intermatic T100 series and T170 series timers
How to wire Intermatic Sprinkler timers
How to wire WH40, EH40, EH10, WH21 timers
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How to wire Intermatic GM40 and WHQ timers
How to wire T1906, T1905, T1975, T1976 timers
How to wire Intermatic ST01C, Ei600, EJ500 timers
How to wire Intermatic/Malibu timers
How to wire Intermatic FM1 timer
How to wire Intermatic PB300 series timer
How to wire Intermatic whole house surge
How to wire remote control timer
How to wire 3 phase timer
How to wire GE 15207 timer
How to wire GE box timers

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Resources:
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programmable timer Compare programmable timers
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