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How to wire
Intermatic T1906 T1905
T1976
T1975
20 amp timers
120 volt, 240 volt, 480 volt
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all results
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How to wire
Intermatic T1906 T1905 T1976 T1975 20 amp timers 120 volt, 240 volt, 480 volt |
| 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 |
 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 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 |
 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  Resources: T1976 manual T1975 manual T1900 series sell sheet T1900HD series sell Sheet |
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 Model numbers 2022 |
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Wiring applies to both T1906
series timer and T1976 series timer
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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 |
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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. |
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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. |
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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 |
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Commercial 480 Volt
T1906E and T1976E and T1976EH control 480Volt Load Heavy Duty T1975EHD and T195EHDR control 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. |
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Commercial 277-480 Volt
T1906E and T1976E and T1976ER control 277 Volt Load Heavy Duty T1975EHD and T195EHDR control 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 |
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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. |
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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 |
 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 OFF  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 |
| Wiring Tips | |
 | Keep wires straight Use solid copper, 600 volt wire (voltage printed on insulation sheathing of each wire. Never use extension cord for permanent residential or commercial wiring. Avoid stranded wire. All wire expands and contracts as power is turned on-off. Heat causes stranded wire to splay apart and get loose, eventually arcing and melting the terminal. Do not use solder on electrical connections. Solder melts with heat as power is turned on-off. If wiring terminals are corroded, try using a toothbrush and vinegar. If wiring terminals are rusted, try using WD-40 and/or fingernail sanding board. If wiring terminals are burned, try using bit of sandpaper or sanding board. If wiring terminals are melted, then timer is probably bad ... it is risky to connect wire to a damaged electrical device ... Keep timer door closed to prevent fire ... the closed door starves a fire from oxygen and extinguishes flame. |
 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 |
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 Use wire connector |
 Use push-on wire connectors |
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| Buy: Push on wire connectors at Amazon Red 3P connector (shown) for 10-14 gauge wire Connector assortment |
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Buy
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