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How
to wire EH10 120 volt water heater timer/ How to wire 240 volt EH40/ WH40/ WH21 |
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EH10 120Volt timer 30 Amp resistive and inductive/ programmable/ SPST/ 1HP @ 120 V/ 5 amp tungsten Minimum 1 minute set times, maximum 6 days 23 hours, 59 minutes Up to 6 on-off per week AA battery for backup and power-outage carryover 1 year limited warranty Override button located on face of timer. Temperature range -40ºF to 104ºF/ back-up battery will fail when exposed to freezing temperatures 7-3/4" high x 3" deep x 5" wide Use 10 gauge wire, 30 amp breaker rated for 4500+ watt element Reset timer using reset button before programming |
| 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  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  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 |
 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 |
 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 in place of twist-on connectorsBuy: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 |
 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 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 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 |
 Terminals 1 and 2 send power to 120V clock. Jumper hot wire from terminal 2 to terminal 3. Neutral wires connect to terminal 1 Ground wires are kept away from other wiring. Romex connectors used where wire enters metal box. Tighten screws very tight against copper wire. |
How to wire Intermatic EH 10 timer for 120Volt water heater 30Amp digital timer DPDT Uses AA battery for backup Reset protocol for surge recovery Use whole-house surge protector 1 year limited warranty Minimum 1 minute set times Up to 6 on-off per week Buy: EH10 120Volt 7-day digital timer at Amazon 12-2 wire at Amazon Resources EH10 manual EH10 sell sheet Figure volts amps watts for water heater |
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EH10
timer controls 240Volt water heater
10 gauge wire, 30 amp breaker rated for 4500+ watt element Timer rated 30 amp 
 Select wire size Read about romex connector 10-2 wire at Amazon |
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Fire
safety/ only solid copper wire under screw plate Use only solid copper wire Do not put insulation under screw terminal Take photo of wires before starting |
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Fire
safety/ only solid copper wire under screw plate Use only solid copper wire Do not put insulation under screw terminal Take photo of wires before starting |
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Fire
safety/ maximum 2 solid copper wires under screw plate Max 2 wires under screws plate Each wire must be same gauge Attach multiple wires with wire connector, and run jumper to screw terminal Resource: Wire and breaker size charts |
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EH10
& EH40 are battery operated timers Battery compartment located beneath buttons Size A battery lasts 2-3 years |
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EH
40 timer |
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EH40
water heater timer 240Volt water heater timer 30Amp digital timer/ SPDT 10 gauge wire, 30 amp breaker rated for 4500+ watt element AA battery for backup Reset protocol for surge recovery Use whole-house surge protector 1 year limited warranty Minimum 1 minute set times Up to 6 on-off per week Override button located on face of timer Buy: EH40 240Volt 7-day digital timer at Amazon 30 amp timers 10-2 wire at Amazon Resources Wiring diagrams: How to wire EH40 EH40 sell sheet EH40 manual Basic water heater circuit How to wire off-peak water heater How to wire water heater thermostats Color code wire  Larger image off peak wiring |
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Jumper
wire connects two terminals 10 gauge wire, 30 amp breaker rated for 4500+ watt element Timer rated 30 amp
Select wire size Read about cable connector 10-2 wire at Amazon< |
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WH
40 timer |
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WH40
water heater timer Timer rated 40 amp 10,000 watt capacity> can control one or two water heaters WH40 timer can be wired many different ways: identical to T104 WH40 timer is same timer as T104 and T104-20, except WH40 has external override lever Up to 12 on-off operations per day Manual override reverses current program until next tripper returns timer to regular schedule Buy: WH40 208-240-277Volt 10000 watt 40 amp at Amazon< T104-20 (WH40) 208-240-277V (no external switch) at Amazon 156T1978 trippers at Amazon Replacement trippers at Amazon Clock motor WG1573 at Amazon 10-2 wire at Amazon Resources Wiring diagrams: How to wire WH40 WH40 manual WH40 sell sheet How to operate and set timer List of replacement parts Photographs of timer and timer parts Troubleshoot Intermatic timer |
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WH21
25amp 240Volt Water heater timer Minimum 1/2 hour on-off times. On trippers cannot be set closer than 2 hours 25 amp controls up to 5000watt water heater SPST 240Volt Red indicator light is ON when Load is ON Buy: WH21 240Volt 23 amp at Amazon 156EB1945a replacement trippers at Amazon WH21 clock motor WG233-18 from Intermatic 10-2 wire at Amazon Manuals/ Resource: WH21 manual Wiring and Troubleshoot WH21 timer Intermatic trippers and parts |
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Color code wire How to twist wire Wire connectors |
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 Contactors/ relays |
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