How to wire Tork DTU40
Tork-DTU40
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Water heater Box timers
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
White 14 gauge 15 amp
120 volt 15 amp outlet, AFCI, GFCI, timer, switch etc can be installed on 15 or 20 amp breaker. Never connect 15 gauge wire to 20-30-40 amp breaker.

White/ #14 gauge wire,  with ground ... 15 amp capacity. Safe maximum 12 amps.
Buy:
14-2 gauge/ 15 amp
14-3/ 15 amp

NMB is house wiring
UF is underground
50-60 amp breaker use 6 gauge /
240 volt 50 outlet can be installed on 50 amp breaker only
6-2 wire
Buy:
6-2 wire
Southwire electric tools
NMB is house wiring
UF is underground
40-50 amp breaker use 8 gauge /
240 volt 40 amp outlet can be installed on 40 or 50 amp breaker only
6-2 wire
Buy:
8-2 wire
Southwire electric tools
NMB is house wiring
UF is underground
     
Copper ground wire.
Every device, load, metal enclosure etc must be grounded. Ground wire must be continuous throughout installation, never switched on-off, never used as a Neutral wire.
Generally ... 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
armored cable
Non metallic flexible cables must carry ground wire, but do not have hazard of short circuit causing injury from shock.

Armored steel cable can be used as a grounded connection, and will protect wires from damage. Metal can be energized from an insulation failure.

All conduit ...metal, plastic ... flexible and rigid ... must be attached to structure, and attached to enclosures, boxes.
Movement, damage and deterioration are major cause of electrical failure.
Buy:
Non-metallic flexible conduit
Power whip
Armored cable
Southwire armored cable cutter
Pull boxes
Southwire armored cable cutter
Electrical tools must be insulated.
Always best to disconnect power, but insulation failure, lack of proper grounding, grounded neutral, lack of GFCI, out-of-code wiring, generator operating without transfer switch, and other problems still pose a risk to anyone working on electric power ... even when breaker is off.

Buy:
Electrician tools kits
KLEIN TOOLS
Tools kits
IRWIN tools
KNIPEX

Telephone cable knife
Low Voltage Mounting Bracket for Telephone
Push on wire connectors

Push-on wire connectors in place of twist-on connectors

Buy:
Push on wire connectors Amazon
Red 3P connector for 10-14 gauge wire
Lever connectors for stranded wire at Amazon
HOOK UP Wires

Protect wiring from damage
Use nipper instead of pliers or screwdriver for removing staples (and nails). Do not damage cable or wires inside cable.

-Code says: Cable SHALL BE secured without damage to the outer covering. NEC sec. 336-15
Buy
End cutting nippers at Amazon


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 at Amazon
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 at Amazon
Klein multimeter
Electric testers at Amazon
Clampmeter for testing amp flow on line

GFCI circuit breaker
A GFCI circuit breaker will protect all boxes on circuit.

Circuit must be grounded. Ground wire must be continuous and connected to each piece of equipment.

White wire on circuit breaker must be connected to Neutral busbar inside the breaker panel.

Buy
GFCI circuit breakers
Push down
single-pole breaker
1" wide Push down breaker
Plug-in breaker
Buy single-pole:
Choose from 15 to 60 amp
Eaton CL series
Siemens 15-60 amp

Single-pole tandem breaker
Tandem breakers
Push down
double-pole breaker
2" wide Push down breaker
Plug-in breakers
Buy double-pole:
Choose from 15 to 125 amp
Choose from 15 amp to 200 amp
Eaton CL series circuit breaker
Siemens circuit breaker
Double pole GFCI

Each 240Volt wiring diagram is different/ but each accomplishes same thing

Applies to GE15000 series, Intermatic GM40, Tork DTU 40, etc
Home
When using black-and-white wires for 240Volt, add tape to white wire.
This action will tell next electrician that white wire carries power

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240Volt

Power connects to Terminals 1 and 2 and jumps to COM terminals
Load connected to NO terminals

Result: 240Volt water heater turns on-off with timer schedule

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240Volt

Power connects to Terminals 1 and 2 and jumps to NO terminals
Load connected to COM terminals

Result: 240Volt water heater turns on-off with timer schedule

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240Volt

Power connects to Terminals 1 and 2
One power wire jumps to COM
Load connected to COM terminal and Terminal 2

Result: 240Volt water heater turns on-off with timer schedule

Why does this work: 240Volt load requires both Hot wires to complete circuit, so when 1 Hot is turned off, then load turns off.

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240Volt

Power connects to NO terminals and Jumps to Terminals 1 and 2
Load connected to COM terminals

Result: 240Volt water heater turns on-off with timer schedule

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240Volt

Power connects to COM terminals and Jumps to Terminals 1 and 2
Load connected to NO terminals

Result: 240Volt water heater turns on-off with timer schedule

Different ways to wire for 240Volt

GM 40 timer controls 2 water heaters

240Volt/ 2 Loads

Check that your timer is rated 40 amp.
This load requires 50 amp breaker and 8 gauge wire
Timer is at max capacity
Power connects to Terminals 1 and 2 and Jumps to COM terminals
Load connected to NO terminals

Result: both 240Volt water heaters turns on-off with timer schedule

240Volt/ and 120Volt/ 2 Loads

Check that your timer is rated 40 amp.
This load requires 50 amp breaker and 8 gauge wire
Timer is at max capacity

Power connects to Terminals 1 and 2 and Jumps to COM Terminals
240V Load connects to NO2 terminal and Terminal 2
120V Load connects to NO terminal and Neutral wire from breaker box

Result: both 240Volt water heaters turns on-off with timer schedule
GM 40 timer controls two water heater

240Volt/ 2 Loads/ Neither Load is ON at same time

Check that your timer NC terminals are included in switch rating.
Woods box timers might not be included.
This load requires 30 amp breaker and 10 gauge wire
Timer is at max capacity

Power connects to Terminals 1 and 2 and Jumps to COM Terminals
1st 240V Load connects to NO terminals
2nd 240V Load connects to NC terminals

Result: both 240Volt water heaters turns on-off, or off-on with timer schedule

Solid copper wire only
Insdulation under screw plate
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Both wires MUST be same gauge
Straighten each wire
Tighten screw very tight against copper wire


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Connect stranded and solid with wire connector and run jumper to screw plate.
See example image

Use wire connector    
Push on wire connectors
Use push-on wire connectors
3 wires/ or different gauge wires
Join wires with wire connector or push-on connector
Run jumper to screw terminal.
Buy:
Push on wire connectors
Red 3P connector (shown) for 10-14 gauge wire
Resource:
How to select and install wire connector
10-3-wire
10-3-wire  12 Ga
10 gauge or 12 gauge?
10 gauge is larger/ for 30 amp breaker. 12 gauge is smaller/ for 20 amp breaker
10 gauge wire can have black-white or black-red
12 gauge will have black and white wires

Buy short pieces 10 and 12 gauge wire at local box store
Compare with your wire.
Match color code and amp rating for wire
With 120 and 277 Volt circuits, white wire is always Neutral, and black is Hot
Hot wire is always switched on-off. Neutral wire remains connected without switching.
With 208 and 240 circuits, both wires are Hot, and both wires carry voltage.
Either Hot wire can be switched on-off. Or both Hot wires can be switched on-off.
Add black tape when white wire carries voltage (applies to 208 and 240V circuits)
CA3750
CA3750 has 5 knock-outs
1 on back, 1 on each side and 2 on bottom

Keep enclosure door closed
Fire safety
Always keep enclosure (box) cover closed
Romex connector Use Wire connectors, or conduit clamps to secure wire to enclosure
By code, all wire must be securely attached to enclosure to prevent wire pull-out.
Wires or conduit must be secured to structure, so there are no loose wires.
Wires inside the enclosure cannot lay over top of connection terminals.
Join all ground wires together and cover with wire connector.
Push ground wires down and away from connection terminals.
2T2500GA plastic outdoor enclosure has 5 knock outs for 1/2" and 3/4" Wire connectors 1 on back, 1 on each side and 2 on bottom
More Intermatic enclosures

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box timers Resource:
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