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How to wire Intermatic T1906
T1905
T1976
T1975
20 amp timers
120 volt, 240 volt, 480 volt
2022
Use only 600 volt wire.
Lamp cord, extension cords are not rated 600 volt.
Use copper wire only. Aluminum wire is fire risk and should be avoided or installed by professional.

30 amp breaker use 10 gauge /
120-240 volt 30 amp outlet can be installed on 30 amp breaker only/ use 10 gauge wire ... cannot be connected to 15-20-40 amp breaker.

Orange/ #10 gauge wire, with ground ... 30 amp capacity. Safe maximum: 30 x 80% = 24 amps.
Buy:
10-2 gauge/ 30 amp
10-3/ 30 amp
Southwire electric tools
Yellow 12 gauge 20 amp
120 volt 20 amp outlet can be installed on 20 amp breaker, but not 15 amp breaker/ use 12 ga wire.
... cannot be connected to 30-40 amp breaker. 1

Yellow/ #12 gauge wire, with ground ... 20 amp capacity. Safe maximum 16 amps.
Buy:
12-2 gauge/ 20 amp
12-3/ 20 amp

NMB is house wiring
UF is underground
Rolls of stranded wire
HOOK UP Wires


Electrically insulated tools
When removing insulation from wire, do NOT score or put cuts on surface of copper wire. Doing so increases resistance and heat on wire and creates possible weak point.
Buy tools:
KLEIN TOOLS
Wire strippers at Amazon
Electric Wire Stripping Machine
Linesman pliers
Utility knife
multimeter
Multimeters
Voltage is tested across two separate wires. Ohms or resistance is tested across both ends of same wire. Amperage is tested along one or two points on same wire.
Buy:
Analog multimeter
Multimeters
Klein multimeter
Electric testers
Clampmeter for testing amp flow on line

T1905 timer
T1905 120 volt
T1906 240 volt

Larger image T1905-6

SPST with NO NC contacts
20 amp
Power consumption: Max 3 watts
Same wiring applies to both T1905-6 series timer and T1975-6 series timer
Only difference between T1905-6 and T1975-6 is day skipper wheel on T1975-6

Buy timer:
T1905 series 120Volt 20 amp 1 Hp timer 
T1905E 480 Volt timer 
T1906 series 208-240V 20 amp timer 

Resources:
T1905 manual
T1906 manual
T1900 series sell sheet
T1900HD series sell Sheet


Intermatic T1906
T1975 120 volt w/ day skipper
T1976 240 volt w/ day skipper
Large image T1975-6
Larger image T1975ER

SPST with NO NC contacts
20 amp
7-day skipper wheel
Power consumption: Max 3 watts
7-day skipper wheel

Buy timer:
T1975 series 120Volt 20 amp with day skipper 
T1975E 480Volt with day skipper 
T1975ER 480-Volt Time Switch 3R Outdoor Enclosure w/ day skipper 
T1976 series 208-240Volt 20 amp timer with day skipper 
T1075 skipper wheel
Resources:
T1976 manual
T1975 manual
T1900 series sell sheet
T1900HD series sell Sheet

Intermatic clock motor Replacement Clock motor
Convert timer to different voltage by changing clock motor
Buy motors
125Volt WG730
208-240volt WG733
480V WG736
Replacement trippers
Buy
156T1950A Trippers


Model numbers 2022
Wiring applies to both T1906 series timer and T1976 series timer


Normally Open turns on with timer settings
Normally Closed turns off with timer settings

Single Pole Double Throw
20 Amp maximum
125, 208-277 and 480 VAC
½ HP, 125 VAC
1 HP, 250 VAC

-40°F to 130°F
Limited 1 year warranty


Larger image
120 Volt
T1905 and T1905P and T1975 and T1975R control 120 Volt Load
Heavy Duty T1905HD and T1905HDR and T1975HDR control 120 Volt load

NO terminal is normally open. NO turns 'on' with timer settings. This terminal used for water heater circuit shown on left.
NC terminal is normally closed. NC turns 'off' with timer settings.

Timer turns off Black hot wire, so 120V water heater has no electricity when timer is off.

Wires at 120V water heater: Connect black-to-black and white-to-white wires at water heater.

Larger image
208-240-277 Volt
T1906 and T1976 control 208V or 240Volt Load
Same wiring applies to 208 thru 240Volt
NO terminal is normally open. NO turns 'on' with timer settings. This terminal used for water heater circuit shown on left.
NC terminal is normally closed. NC turns 'off' with timer settings.

Use 12 gauge wire for 20 amp timer

SPDT single pole, double throw.
Only one Hot leg is turned off.
T1906 timer controls 2-speed pump
Larger image
120 or 208-240V/ control 2-speed pump
1/2 HP at 120 Volt, 1 HP at 240 volt
Low speed is connected to NC terminal, and then pump operates continuously in low speed until timer turns ON.
When timer turns ON, High speed turns ON.
Diagram applies for both 120V and 240V 2-speed pool pumps.
Always check pump voltage and wiring diagram located on nameplate
Other timers can be used for 2-speed pool pump:
Resource:

Intermatic GM40, GE 15207 series, T106 timer, Tork DTU40 timer
Pump operates continuously. Install another timer on White Hot-neutral line to turn pump ON-OFF

Larger image
Commercial 480 Volt
T1906E and T1976E and T1976EH control 480Volt Load
Heavy Duty T1975EHD and T195EHDR controk 480 Volt load

NO terminal is normally open. NO turns 'on' with timer settings. This terminal used for water heater circuit shown on left.
NC terminal is normally closed. NC turns 'off' with timer settings.

Use 12 gauge wire for 20 amp timer

SPDT single pole, double throw.
Only one Hot leg is turned off.


Larger image
Commercial 277-480 Volt
T1906E and T1976E and T1976ER control 277 Volt Load
Heavy Duty T1975EHD and T195EHDR controk 277 Volt load

NO terminal is normally open. NO turns 'on' with timer settings. This terminal used for water heater circuit shown on left.
NC terminal is normally closed. NC turns 'off' with timer settings.

Use 12 gauge wire for 20 amp timer

SPDT single pole, double throw.
Only one Hot leg is turned off. The Neutral wire is not switched on-off

Larger image
T1905 controls 2 loads 120 Volt/ control 2 loads
Same wiring applies to T1905 timer and T1975 timer Only difference between these two timers is the day skipper wheel on T1975

NO terminal is normally open. NO turns 'on' with timer settings. This terminal used for water heater circuit shown on left.
NC terminal is normally closed. NC turns 'off' with timer settings.

Larger image
For T1906 and T1976, White wire is Hot
For T1905 and T1975, White wire is Neutral
120/ 208-240-277V / or 480V control Two Loads
T1905, T1906 & T1975, T1976 control two Loads

Each Load is same voltage ranging from 120V, 208Volt to 277Volt, or 480V
Neither Load is turned ON at same time. Either NO Load or NC Load is active, but not both same time.

Bare ground wires (not shown) connect to green screw.
When using White wire to carry Hot, then add black tape to tell next electrician that wire carries voltage.

Maximum 2 wires under screw plate.

To control different voltages, see wiring below, or use timer with dry terminals such as GM40.
Resource:
How to wire GM40
T1900 Heavy duty series
Larger image T1075EHD
Larger image T1905HD
T1905HD 125V heavy duty
T1975EHD 480V heavy duty

Wires same as shown above
With day skipper
24 hour timer
NO NC contacts
20 amp
Motor withstands surge up to 6000 volts
Encapsulated motor
Long life under extreme conditions
96 trippers 15 minute increments
Permanent built-in trippers
Permanent manual override: Full ON or Full OFFT1905HD
Buy Timer:
1906HD heavy duty 125 volt 
T1975EDH heavy duty 480Volt with day skipper 

Resources:
T1900HD series sell Sheet with wiring
T1975EHD sell sheet
Instruction manual
Same wiring as T1905 and 1975 shown above

Buy

T1975EHD 480Volt heavy duty captive trippers with day skipper 
T1905 HD 120Volt heavy duty captive trippers with day skipper 


10-3-wire  12 Ga
20 Amp timer use 12 gauge wire
Compare your wire with short pieces of 12 gauge wire from local hardware

12 gauge for 20 amp breaker
12 gauge will have black and white wires
.
Resources:
Match color code and amp rating for wire
Basic house wiring
Keep wires straight
Use solid copper wire
If wiring terminal or end of wire are covered with green, use emery board to clean terminal and sandpaper to clean wire.

Insdulation under screw plate
Larger image

Use wire connector  
Push on wire connectors
Use push-on wire connectors

Larger image
Buy:
Push on wire connectors at Amazon
Red 3P connector (shown) for 10-14 gauge wire
Connector assortment




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Tools
DEWALT
Black and Decker
Stanley
SKIL
Makita
Porter-Cable
Bosch

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Fluke electrical testing
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Campbell Hausfeld air powered
Tekton automotive

Powerbuilt automotive
Saws and saw blades

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