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How to wire T102 timer
SPST 240-277 volt timer for lights, motor. pump, water heater etc
water heater timer
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Indoor metal box
SPST 240 volt
T102 series at Amazon 

T 104R
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Indoor metal box/ day skipper
T172 at Amazon
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240 volt Mechanism only
T102M at Amazon
T 104R
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Outdoor metal box
T102R at Amazon
T101P timer
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Outdoor plastic box
T102P at Amazon
Wiring for T102
T102 208-277-240 volt wiringWire Intermatic T102 timer T-102 timer 208-240 volts
Hot1 and Hot2 connect to Terminals 1 and A
Hot 2 to Load connects to Terminal A
Hot1 to load connects to Terminal 2
Timer clock motor is pre-wired for this installation

When white wire is used to carry voltage, instead of used as neutral wire, then add black tape to notify next electrician what wiring is present.

T102 manual
T172 manual:
Intermatic T102 wiring
T-102 timer 277 volts
T102 is for voltages from 208V to 240V to 277V
Hot connects to Terminal 1
All Neutrals connect to Terminal A
Hot to load connects to Terminal 2
Timer clock motor is pre-wired for this installation
277-480 3-phase
How to wire 3-phase timer
T102 timer is fully repairable
How to take apart and repair T100 series timers
Intermatic clock motor T-102 clock motor 240 Volts (208-277V)
WG1573 for 60 Hz 240V
T-102 clock motor 240 Volts (208-277V)
WG1573 for 60 Hz 240V at Amazon
Change T102 timer to different voltage
by changing clock motor
Intermatic clock motor >>>>> Intermatic clock motor
T-102 timer changed to 24 Volts
CW1570 for 60 Hz 24V at Aplus
T-102 timer changed to 120 Volts
WG1570 for 60 Hz 480V at Amazon
T-102 changed to 50 Hz:
WG1571-10D motor for 50 Hz 120Volt
WG1574-10D motor for 50Hz 208-277V Amazon
T-102 timer changed to 480 Volts
WG1576 for 60 Hz 480V at Amazon
How to replace Intermatic clock motor
156T1961A tripper Trippers
Dial can have 12 sets ON-OFF trippers
156T1978 trippers Amazon
2T2485GA enclosure Convert indoor timer into outdoor timer:
Buy different enclosure.
Use thumb spring located top inside timer to remove mechanism from enclosure

2T2502GA beige plastic Outdoor box at Amazon

124T1952 Insulator
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124T2411A insulator pk 25
-Keep insulator over screw terminals to prevent accidental electrocution hazard.
Insulator pushes down over two knobs located on timer mechaism below the yellow dial.
124T1948 single pole T101, T102, T105
124T1948 single pole T171, T172, T175
124T1948 at Amazon

Black rigid
124T2411A  rigid
At Amazon

Installation tips
-Secure wire or conduit to enclosure. All wires, enclosures and conduit must be secured to structure.
-Always use solid copper wire under timer screw terminals ... stranded wire can come loose and cause fires.
-Keep enclosure door closed to prevent possible fire hazard from spreading.
-Keep insulator over screw terminals to prevent accidental electrocution hazard.
-Install enclosures away from hazards such as lawn mower or machinery.
-Install outdoor boxes in sheltered area if possible and 12" above anticipated snowfall.
-For safety, make sure Load is grounded correctly. People often forget to securely join the ground wires inside timer because wire sometimes gets a bit short. Buy extra length of wire from box store. Load must be grounded. Why you need ground wire
Use correct wire and breaker
Oversized is OK, undersized is hazard
Look at label on load to determind correct size wire and breaker
Watts divided by volts = amps
If Load is 240 volt, and watts is 4500 = 18.75 amps.
Next calculate 80% safe maximum. 20 amp breaker x .80 = 16 amps safe maximum
30 amp breaker x .80 = 24 amps safe maximum
The calculation shows that 4500 watt load requires 30 amp breaker and 10 gauge wire up to 150 feet.
Longer distance, use larger wire and breaker.
Buy from my affiliate links:
Southwire cable and tools
Figure volts amps watts
Wiring for other T100 series timers
T101 Wiring: How to wire T101 and T171 series timers
T101B Wiring: How to wire T101B timer
Applies to T101B with separate wiring terminals
T103 Wiring: How to wire T103 and T173 series timers
T104 Wiring: How to wire T104 timer
Applies to T103, T103R, T103P, T103M, T103PCD82, T173, T173R T173M  see all models
How to wire Intermatic T102: How to wire T102 and T172 series timers
How to wire Intermatic T105: How to wire T105 timer
Nema 1 indoor enclosure/ 
To convert to 208-277V operation, replace WG1570 clock motor with WG1573 clock motor
How to wire Intermatic T106 timer: How to wire T106 timer
Nema 3R indoor-outdoor enclosure
To convert to 120V operation, replace WG1573 clock motor with WG1570 clock motor
How to wire Intermatic pool timer: How to wire pool timers
Control centers:
Control centers: + manuals and parts

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Intermatic enclosures
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How to connect rain sensor when timer does not have rain terminals
How to Set & Troubleshoot Intermatic sprinkler timer/ pdf
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           Intermatic ET279 timer    Et70215 timer
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Timer modules/ 16 amp/ 12 to 240 volt
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