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How to wire GE 15312 Sunsmart timer for Single pole & 3-way |
30
amp breaker use 10 gauge /  Buy: 10-2 gauge/ 30 amp 10-3/ 30 amp Southwire electric tools |
Yellow
12 gauge 20 amp Yellow/ #12 gauge wire for 20 amp with ground Buy: 12-2 gauge/ 20 amp 12-3/ 20 amp NMB is house wiring UF is underground Rolls of stranded wire |
White
14 gauge 15 amp White/ #14 gauge wire for 15 amp with ground Buy: 14-2 gauge/ 15 amp 14-3/ 15 amp NMB is house wiring UF is underground |
 Buy: Armored cable |
 Southwire armored cable cutter Buy: Rolls of stranded wire |
Stranded wire  Buy: Rolls of stranded wire |
50-60
amp breaker use 6 gauge /  Buy: 6-2 wire Southwire electric tools NMB is house wiring UF is underground |
40-50
amp breaker use 8 gauge / Buy: 8-2 wire Southwire electric tools NMB is house wiring UF is underground |
  Copper ground wire Use same size as other wire in circuit Buy: 12 gauge copper ground wire Ground wire Green ground wire Ground pigtails Ground rods/ ground clamps at Amazon |
 Buy End cutting nippers at Amazon |
  Buy tools: Wire strippers at Amazon Linesman pliers Utility knife at Amazon |
 Buy: Multimeter Electrical testers |
 Buy: GE 15312/ 120 volt/ requires neutral 15312 at Amazon 32787 timer Resources: GE 15312 manual GE 15312 wiring manual All GE timers and Manuals |
 Buy: ST01 / 120-240 volt/ any load/ no neutral Intermatic ST01c timer Intermatic ST01 timer |
  Compare all programmable timers |
| Single pole starts here | ||
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If Single-pole
box
has neutral and 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  |
 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 |
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 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 battery-operated ST01C timer instead Buy: Intermatic ST01c timer Intermatic ST01 timer CR2 replacement battery LED bulbs at Amazon Resource Read more about ST01C ST01C is battery operated and does not need Neutral. Rated for any load or voltage. CFL, LED, motor loads etc. Use for single-pole or 3-way, or Dawn-dusk or programmable 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 |
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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. Rated 15 amp for CFL, LED, Incandescent, Motors, etc. Up to 100' away |
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 If neutral wire is not present, Use ST01c Timer ground wire not shown  |
Use
GE 15312 timer to control 120Volt , 240 volt load, water heater, pump,
contactor etc 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. Alternate timer: 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/ slow-blow fuse  Buy: fuseholder: ANL fuseholder Buy fuseholders Fuse blocks at Amazon Electrical terminals Din rail fuseholder 10 x 38 mm fuse Contactors Some fuseholders accept terminal connections, some have solder-only connections. Fuse block has screw terminals. Resources Fuseholder Contactors Terminals Fuse block |
ST01 timer does not require
Neutral wire to accomplish same as GE15312 timer. Buy:
ST01c timer 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 10-15 amp busman line fuse to protect timer if circuit breaker exceeds 20 amp. In-line fuse will protect timer and wire and contactor coil. Select fast acting, or delay/ slow-blow fuse Buy: ANL fuseholder Buy fuseholders at Amazon Contactors Fuse block Some fuseholders accept terminal connections, some have solder-only connections. Fuse block has screw terminals. |
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In-line
fuse to protect photo eye Add 15 amp busman line fuse to black wire going to photo eye to protect device if amp load of motor exceeds photo eye maximum load rating. See illustration Buy: Panel mount fuse holders at Amazon ANL fuseholder Buy fuseholders at Amazon Fuse blocks at Amazon Electrical terminals Solder guns Buy fast and slow acting fuses: Ceramic fuses at Amazon Fast acting ceramic fuses Resource: Read more about fuseholders and fuses |
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Yellow
female terminal for 10-12 gauge wire Blue female terminal for 14-16 gauge Available hardware store, home center, electric supply, lighting store, internet Buy: Terminal kit at Amazon with crimp tool Electrical terminals at Amazon Blue 14-16 gauge female terminals 20 pcs at Amazon Yellow 12-10 gauge female terminal 16 pcs 360 pc assortment at Amazon |
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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) |
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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 |
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 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. |
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 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 connector and shoved to back of box. |
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No
Neutral wire 3-way switches One box will have only 3 wires |
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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 |
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Replace
Line side switch with NO Neutral NOT CODE 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 |
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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. |
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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 |
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 One
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 |
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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 |
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