 Compare all 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  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 |
Each 240Volt wiring diagram is different/ but each accomplishes same thingApplies to GE15000 series, Intermatic GM40, Tork DTU 40, etcHome |
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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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240VoltPower connects to Terminals 1 and 2 and jumps to COM terminalsLoad connected to NO terminals Result: 240Volt water heater turns on-off with timer schedule |
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240VoltPower connects to Terminals 1 and 2 and jumps to NO terminalsLoad connected to COM terminals Result: 240Volt water heater turns on-off with timer schedule |
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240VoltPower connects to Terminals 1 and 2One 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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240VoltPower connects to NO terminals and Jumps to Terminals 1 and 2Load connected to COM terminals Result: 240Volt water heater turns on-off with timer schedule |
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240VoltPower connects to COM terminals and Jumps to Terminals 1 and 2Load connected to NO terminals Result: 240Volt water heater turns on-off with timer schedule |
Different ways to wire for 240Volt |
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240Volt/ 2 LoadsCheck 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 |
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240Volt/ and 120Volt/ 2 LoadsCheck 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 |
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240Volt/ 2 Loads/ Neither Load is ON at same timeCheck 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 |
 Larger image Both wires MUST be same gauge Straighten each wire Tighten screw very tight against copper wire |
 Larger image Connect stranded and solid with wire connector and run jumper to screw plate. See example image |
Use wire connector |
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 |
  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 |
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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) |
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 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 |
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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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