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2014

How to wire switches

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Never assume power is OFF/ always test

Use non-contact voltage tester on timer, on wire, on outlet to see if power is present.
Press button on tester, if single beep then no power is present. If continuous beep then power is present.
Never stand on bare ground, always stand on dry boards, do not hold or touch anything metal when working on timer or water heater that has power, tape tester leads to wood sticks, never touch wet water heater, or flooded water heater, or timer that had a short or fire without turning power OFF.


Buy testers:
Multimeters at Amazon
Buy non-contact voltage tester at Amazon
Electric testers at Amazon

Shop Amazon - Industrial and scientific
Shop Amazon - Industrial Electric Products
Wire GE 15312 timerGE 15312 timer wiring
Larger image with more detail

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Single pole - No Neutral

Power at light fixture in ceiling

All wiring must be inside a box with cover

How to wire switches with no neutral wire
Power enters at light fixture
There are no white wires covered with wire nut and pushed to back of box.
Wire colors can vary
Single pole - Neutral in box

How to wire switch with neutral wires present inside switch box
Single-pole is when 1 switch control light(s)
single-pole switch has 2 dark screws or 2 brass screws, and 1 ground screw
Neutral wires are never connected to switch.
Loacation of neutral wire affects switch wiring, because wire color can change
If neutrals are present inside box, then they will be the white wires that are twisted together, covered with wire nut and pushed to back of box.
Resources:
Steps for replacing typical switch
How to troubleshoot loose wire, ground fault, or short
Single pole - Neutral - in junction box
Any box can be a junction box... with wires that go to other boxes
How to wire switch inside junction box, with neutral wires
Neutral is never connected to switch.


Neutral wire is never connected to switch
Outlet boxes always have neutral wire
Switch boxes and ceiling boxes can have neutral, or they can be without neutral wire.

Release wire from switchQuick connects
Use quick connects to install wiring devices quickly
Push wire into hole on back of device that is located nearest to correct screw terminal

Release wire from quick connects:
Push small screwdriver into slot next to hole, while pulling on wire > usually takes all 3 hands
Timer switch combo .pdf
Quick connect

How wiring looks inside the wall

Basic 120Volt wiring inside wall
More detailed image

Timers replace switch

How to wire timers
 Swilight LST 700    


Light with 3 light bulbs
Power at switch: Larger image

Power at switch, vrs Power at light

Lamp with 3 bulbs will have 3 white wires and 3 black wires.
Twist white wires together, and twist black wires together
Light and switch
Power at light: Larger image



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1 switch and 2 lights

main breaker box
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Review: Basic 120V and 240V wiring

120Volt circuit requires 2 wires to complete circuit
120Volt requires Hot and Neutral
When installalling a switch, the Hot wire is cut, and switch installed.
Switches always turn the Hot wire on-off.

Neutral wires are never connected to switch
Only the hot wire is turned on-off. The neutral is always continuous between Load and breaker box

240Volt circuit also requires 2 wires to complete circuit
240Volt requires Hot1 and Hot2.
No Neutral wire is involved in 240Volt circuit
Read more
240Volt circuit can be turned on-off by cutting power to either Hot1 or Hot2
Double-pole Switches can turn both Hot wires on-off.

Resources:
Electicity from pole to breaker box
How to replace circuit breaker
How to select wire size and breaker size
Maximum 12 boxes per 120volt circuit
3-way switches  -   Neutral in box

How to wire 3-way switches with neutral wires
3-way is when 2 switches control same light(s)
3-way switch has 1 dark screw (common), 2 brass screws, and 1 ground screw.


Common screw is marked on back of device
Most 3-way switches, the common screw is different colr than other two screws.

-Recognize a 3-way switch because it has 3 screws. (excluding ground screw)
-3-way switch can be used as ordinary single pole switch by using the common screw and either of the other two screws.
Resources:
Change 3-way switch into single-pole switch
Add outlet to 3-way switches

3 way circuit
Leviton 5245 3-way combo
Larger image
Image showing how to wire so both outlets ON at all times
3-way combo device: 
Requires Neutral in box
3-way switch with outlet is called combination 3-way switch
Requires neutral wire
Single-pole combination switch wiring: scroll down page

Common screws have break-away fin.
If fin is attached, then both common screws are bonded electrically, so connect Hot to either common screw
When installing this device on Load side, remove break-away fin between common screws, and run Hot wire to dark screw opposite the outlet
See image for getting Load side outlet to work at all times Image
Resources:
Leviton 5245 manual
See single-pole combo switch wiring
Replace outlet with combo switch
Buy:
Leviton 5245 at Amazon

3-way switches - No neutral  - power at light in ceiling

How to wire 3-way switches with no neutral wire

3-way switches control water heater
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3-way switches control 240Volt water heater (or motor)

Use ordinary 15 amp 3-way switches from hardware store
Must add busman fuseholder with 15 amp fuse. This will protect line and switches from over-amp and fire.
240Volt coil on DPDT contactor.

Resources
More water heater switches
Contactors
Busman fuseholder
Wire and breaker size
3-way switch and 3-way timer

Neutral wire not needed for this installation
ST01C programmable timer requires no neutral since timer has battery
Connect 3-way switch to 3-way timer as shown
When power is applied to red wire, the timer program reverses

Resources
How to wire Intermatic ST01C
How to wire GE 15312
How to wire 3-way timer
How to control water heater with two 3-way switches
How to select wire size and breaker size

Buy:
ST01C timer at Amazon

120Volt Timer controls 240Volt water heater
4-way switches 4-way switch
How to wire 4-way switch added to 3-way switches
4-way switch circuit is a 3-way circuit with 4-way switch added between each 3-way switch
Common is dark-colored screw on 3-way switches.
3-way switches have 3 screws (plus ground screw)
4-way switches have 4 screws (plus ground screw)

Double-pole switches and 4-way switches are different but look the same
Be careful:  Double-pole switches and 4-way switches each have 4 screws. They look similar.
: 4-way reverses both wires when switch position is changed.
: Double-pole switch turns both wires On-or-Off when switch position is changed.
Test switch terminals with continuity tester or multimeter
Buy:
4-way switches at Amazon
Multimeter at Amazon
Continuity tester at Amazon
Non-contact voltage tester at Amazon
Test, measurement and inspection supplies for professionals
how to wire double switch
Double switches - NO Neutral

Double switch/ NO neutral inside switch box
Wire colors can vary
Applies to double rocker, and all double switches

The Hot wire connects to screws that are bonded together.
While screws on other side of device are each singular and not connected to each other in any way.

Just because a wire is White, does not mean it is automatically a neutral wire.
Buy:
Double switches at Amazon

Applies to single-pole double rocker, double despard switches etc
How to wire double rocker switch
Double switches - With Neutral

Double switch with neutral inside switch box

Screw color can vary
Applies to all double switches

The Hot wire connects to screws that are bonded together.
While screws on other side of device are each singular and not connected to each other in any way.

Neutral wires can usually be identified as the group of white wires covered with wire nut and  pushed to back of box.

Applies to fan-light switches
Resources:
Lutron fan light switches
Buy:
Double switches at Amazon

Applies to all double single-pole switches
Wire double rocker switch to GFCI

Connect switch to GFCI

Example shows double rocker switch
How to wire double rocker switch to GFCI
Rocker switch and lights are GFCI protected

Resources/ wiring instructions
How to wire GFCI outlets and switches

Buy
GFCI outlets at Amazon
GFCI outlet with switch at Amazon

Double 3-way switch wiring Wire double 3-way switch
Double 3-way switch
Combine two 3-way switches into one
Example: Use this where 2 hallways meet.
Each hall has 3-way switches
Can also be used as ordinary double pole switch by using only one of two screws on opposite side from common.
Rated 120Volt thru 277 volt
120V and 277V circuits cannot be in same box.
All 120 volt circuits shown apply to 277 circuits with 1 Hot and 1 Neutral
Buy
Double 3-way switches at Amazon
Leviton 5640 double 3-way rocker switch Amazon

Leviton 5243 double 3-way toggle at Amazon
triple Despard switches
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Triple switches

3 individual single-pole switches
Despard switches mount individually in a metal strap.
Buy
Despard switches at Amazon
Triple switch at Amazon
Despard switches and despard outlet can be mounted into same strap. So you can have 2 switches and 1 outlet, or 3 outlets etc.

One Hot wire goes to each switch.
Some triple switches: all 3 screws on hot side are bonded with metal jumper or break-sway fin, or hot side is installed as 1 single screw

Triple switches
Applies to all triple switches

Leviton triple switch has 1 screw for Hot wire
Connect Hot to this screw.
Connect Load lines to 3 screws on other side of switch
Buy
Triple switch at Amazon
Despard switches at Amazon
Despard outlet
Despard wall bracket

Despard switches
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Fan light heater combo - power in ceiling box
Use triple switches - 2 cables from switch box to ceiling


No Neutral - power in ceiling box
Use triple switches to control Fan-Light-heater combo
Neutral wire is not required for switches

Wire colors can vary
Turn power off, Use multimeter set to read Ohms to check which wires go from ceiling to switch box

Resources:
How to select wire size and breaker size

Buy:
Despard switches at Amazon
Despard outlet
Despard wall bracket

Triple switch at Amazon

Gang switches

Gang switches.
This means 2 or more switches or outlets 'ganged' together in one box.

Hot wire will connect to each switch, starting at first switch and jumpering to each other switch or outlet

With 120V, each gang box has 1 Hot wire by code.

how to wire 4-function switch
See image with ground wire

'4-function' switches - With Hot-Neutral at switch

How to wire 4-function switch
Box requires neutral wire to power push-button timer.
Do not connect push button timer to heater
Spring wound timer is rated enough wattage to control heater.
Double switch control 2 different lights

All ground wires connect together, and also connect to any green wires or green ground screws.
Resources:
Ventilating Fan- bathroom light combo manual
How to select wire size and breaker size
Compare countdown timers and electric rating

Broan bath fans and heaters at Amazon
Broan bathroom fans and heaters at Amazon

How to wire 4-function switch
Larger image

4- function switches - No Neutral at switch - power in ceiling box

How to wire 4-function switch

Lights-fan-heater located in ceiling box.
Power wire enters ceiling box, so neutral wire is not available inside wall box.

If switch box does NOT have neutral wire.
Connect bath-fan timer white and timer green wires to bare ground wire.
How to wire timers
Do not connect push button timer to heater

Spring wound timer is rated for enough wattage to control heater.

Double switch control 2 different lights

All ground wires connect together, and also connect to any green wires or green ground screws.
How to wire Legrand TM813 How to wire TM813 switch
Pass and Seymour TM813
Legrand TM813 switch has single-pole and 3-way switch.

Diagram shows how to wire 3-way switch that controls a light, and single-pole switch that controls a fan.

Example shows removal of break-away fin since Hot wire powering 3-way circuit is located in box with other 3-way switch.

Resources:
Manual
Buy:
TM813 switch at Amazon
How to wire TM8111 switch How to wire TM8111
TM8111 switch

Resource:
Manual
Buy:
TM8111 switch at Amazon
Cooper 277 pilot light switch
See testing photographs 1 2
Read about 120Volt circuit
If you are replacing ordinary switch that has 2 wires, one of the wires is Hot and other wire is Load. Remove switch, turn power ON, tape tester leads to wood sticks, and test each wire to bare ground wire. Tester lights up on Hot.
Pilot switch
Leviton pilot light switch
 Larger image
Leviton pilot light switch
How to wire pilot light switch

Neutral wire must be available.
Neutral wire are white wires that are twisted together and covered with wire nut and pushed to back of box.
Neutral wire can be found inside any outlet box
Buy
Pilot light switches at Amazon

Pilot light switches, or indicator light switch, is designed to activate the pilot light when switch is turned ON.
When switch is OFF, the pilot is OFF.

Black Hot wire from breaker box connects to screws that are on same side as break-away fin.
Each 120volt electric box has only 1 Hot wire.
Take photo of wiring, separate wires for testing, and then test each wire to bare ground wire, and tester will light up on 120V Hot.

Load wire going to light connects to brass screw opposite the switch.
White neutral wire connects to silver screw opposite the pilot light.
What is neutral wire: Neutral wires are the white wires that are twisted together and covered with wire nut and pushed to back of electric box.
If box does not have neutral wires, the pilot will not work.
It is out of code, but ground wire connected to silver screw will allowpilot light to function until neutral wire can be pulled over to switch box from any nearby outlet box.
Resources:
Leviton pilot switch manual
Also see how to wire Cooper pilot light switch
How to wire 3-way pilot light switch
How to wire GFCI pilot light switch
Buy
Pilot light switches at Amazon
Combination switch outlet
If you are replacing ordinary switch that has 2 wires, one of the wires is Hot and other is Load. Remove switch, turn power ON, tape tester leads to wood sticks, and test each wire to bare ground wire. Tester lights up on Hot.
Combo switch
Switch and plug combo

Neutral wire must be available.
Neutral wire are white wires that are twisted together and covered with wire nut and pushed to back of box.
Neutral wire can be found inside any outlet box
Combination switch outlet at Amazon

1) Polarized outlet has a wide blade and narrow blade.
Black Hot wire from breaker box connects to screws that are on same side as narrow blade.
Notice also that screws on Hot side of device have a break-away fin. If fin is removed, then add a wire that connects both screws.
Each 120volt electric box has only 1 Hot wire that tests 120V to ground wire.

Load wire going to light connects to brass screw opposite the switch.
White neutral wire connects to silver screw opposite the outlet. Neutral wires are the white wires that are twisted together and covered with wire nut and pushed to back of electric box. If box does not have neutral wires, the outlet will not work.
It is out of code, but ground wire connected to silver screw will allow outlet to function until neutral wire can be pulled over to switch box from any nearby outlet box.
Resources:
See 3-way combo switch wiring
How to replace outlet with combo switch
Buy:
Combination switch outlet at Amazon
How to wire combo device

Combo switch controls outlet - requires neutral

Switch and plug combo so switch controls outlet
If your switch does not have 2 screws on Hot side, then this wiring is not possible
Hot side has the narrow outlet blade.

Review instructions above for basic wiring
1) Use screwdriver or pliers to remove break-away fin between Hot side screws.
If Hot side does not have break-away fin, then wiring is not possible.
2) Add a jumper wire between brass screw (on Load side) and outlet screw as shown in diagram

Jumper wire
Combination switch outlet
Larger image

GFCI switch combo - requires neutral

Resources:
How to wire GFCI
How to wire arc fault
Buy:
GFCI Combination switch outlet at Amazon



Larger image
How to wire 2 outlets
Outlets are wired in parallel
Each outlet receives Hot wire and neutral wire.
Inspect screws on each outlet to make sure the Brass screws are bonded together, and Silver screws are bonded together.
Connect Black Hot to side with brass screws and narrow blade.
Connect White Neutral to side with silver screws and wide blade.

Outlets have amp rating printed on back of device.
Match amp rating and expected load.
Always connect ground wire.
Resources:
Select and connect wire nuts
How to twist wire
Select correct wire size
DPDT switch

Double pole Double throw
Bryant 3025BRN switch
Toggle between 120Volt and 240Volt

Resources:
How to wire water heater for 120 Volts
Off peak water heater thermostats

Match watt rating of wiring device with watt rating of appliance.
30 amp device x 80% = 24 amp safe maximum
Calculate volts amps and watts for water heater

Buy:
Bryant 3025 at Amazon
water heater switch

Water heater switch/ 30 amp

240V water heater can be controlled directly with a 30-amp switch

Look for green colored switch
Max 25 amp rating on 30 amp switch
5500 Watt elements draw 23 Amps
4500 Watt elements draw 19 Amps

Resources:
How to wire water heater with ordinary switches
Figure volts amps watts for water heater

Buy:
Cooper 3032 switch at Amazon
Leviton 3032 30 amp switch at Amazon
Leviton 30 amp switch at Amazon
water heater 30 amp switch 3-way Water heater switch/ 30 amp

240V water heater can be controlled directly using 30-amp switches

Here is drawing for 30-amp 3-way circuit

Note: the 240V circuit has 2 hot wires <> putting a switch on 1 hot wire will work
Max 25 amp rating on 30 amp switch
5500 Watt elements draw 23 Amps
4500 Watt elements draw 19 Amps



Resources:
Control water heater with two switches
Figure volts amps watts for water heater

Buy:
Leviton 3033 switch at Amazon

Water heater switch/ 15-20 amp switch

Resources:
How to wire ordinary switch to water heater

Garbage disposal switch

Only Black Hot wire connects to switch
White Neutral wire does not connect to switch

Resources:
How to wire GFCI switch
How to troubleshoot, repair, install garbage disposal
Outlet is warm

Safety

Warm switches and outlets indicate loose wires, and/or overload.
Check for overheating and electrical problems using hand to feel for heat.
All electrical switches and outlets must be covered
Cover electrical junction boxes, close timer doors, cover main breaker box and keep panel door closed.
This action will prevent sparks from starting fire inside home, and prevent overheated wires from starting fire.
Resources:
Troubleshoot household electrical problems
install 2 old work boxes
Larger image

Install new Boxes

Resources:
How to install switch box
Motion detector switch Motion sensor switches
Wiring varies widely by brand and model number, wire color, and application
Some motion detectors replace single-pole switch, while others replace 3-way switch, while others can be wired in parallel
Resources:
Cooper motion sensor wiring/ by model number
Leviton motion sensor wiring
Leviton occupancy sensor
Pass and Seymour occupancy sensors
Buy:
Motion sensor switches at Amazon
How to wire motion sensor Motion sensor light fixture - Replace outdoor light fixture
The motion sensor is the switch.
If previous light fixture has on-off switch, turn the switch ON to make sure motion sensor switch has power.

There will be 2 wires (black and white) for each light
There will be 3 wires for motion switch (black, whire and red)
There will 1 Black Hot and 1 White Neutral arriving in box.

Twist all white wires together. Cover with wire nut
Black Hot connects to black wire on motion detector. Cover with wire nut.
Motion detector Red wire connects to black wires going to each light. Cover with wire nut.
Resources:
Wire nut basics

Buy:
Motion sensor outdoor lights at Amazon
Motion sensor spotlights at Amazon



Omron LY23 AC Model terminals/ back to front:
7-8 magnet terminals (turned opposite direction from other pins)
5-6 common terminals
3-4 NO normally open terminals (power is off when relay off)
1-2 NC normally closed terminals (power is On when relay is off)
Load rating 7.5 amps AC
900 watts incandescent @ 120V
1800 watts incandescent @ 240V
1/4 Hp motor @ 120V; 1/2 Hp @ 240V
Photo eye switches
To reverse operation of photo-eye
So Load comes on during daylight hours
photo eye connected to DPDT relay

30 Amp relay x 80% = 24 amp max up to 2880 watt @ 120V or 5600 watt @ 240V
30 amp 10 gauge wire up to 2 Hp @ 50' or 1.5 Hp @ 100' @ 120V See load charts
Use Omron 120volt LY2-AC 8-pin relay for 7.5 amp.
    NO NC Relay
    7.5Amp Omron         30Amp DPDT
Buy
Omron LY2 at Amazon / Choose 120Volt coil
30 Amp DPDT relay at Amazon
DPDT Packard at Amazon
Resources:
Omron relay/Page 450 / pdf
How to wire and troubleshoot photoeye

Remote control switch

Advanced technique in my office

Resources:
Timer with remote control
Remote control switches
How to select wire size and breaker size
Two speed fan wiring.

Pin timers

Resources:
How to wire pin timers
How to wire delay timers

How to wire timers:

Resources:
How to wire Programmable wall timers

GE 15312 timer
Intermatic ST01C, Ei600

How to wire Intermatic timers
How to wire GE timers
 Swilight LST 700  
Intermatic GM seriesTork-DTU40

Box timers

Resources:
Water heater timers
How to wire box timers

Larger image

Battery-powered wall switch timer

Turns light switch on and off
9 ON-OFF, 2 AA batteries
Resources:
Utilitec 0357930 manual
Utilitec TMDW50L manual
Utilitec timers
Buy:
AutoChron at Amazon

How to set timers

Resources:
Timer switches
Siemens 45EG20AF Definite Purpose
      3 pole contactor

Contactor switches

Use contactor to control large Loads such as water heater or pool pump
Control contactor with timer or switch

2-pole contactors, and 3 pole contacotrs

Resources:
See contactors
Control 30 amp water heater with ordinary 15amp switches
Figure volts amps watts for water heater
How to wire 3-phase timer using contactor
Moroso switch wiring
Larger image

Automobile switch wiring

Moroso switch wiring.
Light and fan receive + power from battery after switch is activated. Light turns ON and Fan turn ON when circuit is completed back to - pole on battery as power travels through metal body of automobile.
Fuse protects each wire and device from overheat or overamps that will short and burn parts.
For example if fan motor + shorts to ground, a surge of amperage wll flow, exactly as if battery + terminal was connected to - terminal. Wires get hot, and smoke, except the fuse trips off when heat exceeds fuse rating. When the fuse trips, it stops the overheating which can melt parts and cause fire. Fuse must match expected load demand of light and fan together, but not exceed amp (heat) rating of either accessory, or amp rating of wire. Volts x Amps = Watts
More than 1 switch: Jump + power wire to each of the other fuses, and repeat wiring for each fuse-switch-light
Resources:
Moroso instruction manuals
Example moroso manual
Common electrical formulas
Buy:
Moroso switches at Amazon
Photo switch resource
Intermatic photo switch
Canopy switch
Cooper 1664
wire fan switches

Fan switches

Good luck
How to wire fan switches

Add another switch upstairs

How-to-add-3-way-switch.html
4 DP switch
soon

Delta switch company
Micro switches
Ignition switches
Fireman switch
Automatically turns OFF swimming pool heater 20 minutes before pool pump turns OFF

Resources
Intermatic pool timers
Control panels
Resources for air switch
Air switch
More pool parts

http://waterheatertimer.org/images/GM40-dip-switches.jpg

Dip switches

Resources
How to wire GM40 timer
How to wire GE 15207 timer

Larger image

Ceiling junction box

1 single 12-2 cable travels to light switch
Light fixture attaches to Hot from switch and neutrals

wire switch to outlet
Larger image

Add a switch to any outlet

Add a switch and light to any outlet
Maximum 12 boxes per circuit breaker.
Drop power wire into outlet box.

Old work box
How to drop wire into wall
Add outlet to switch
Larger image

Add outlet to a switch

Add outlet to switch
Neutral wire required
Add outlet

Add new outlet

Add new wire to any outlet
Run wire to new box
Code says max 12 boxes per circuit breaker

Resources
Read pdf
Figure wire size
3 speed fan switch
Larger image

3-speed fan switch

Resources
Pass and Seymour 3-speed Fan switch
Additional resources
Electricity leaves power plant Resources
What is 3-phase electric: power plant to end user

Troubleshoot Household electricity

Figure volts amps watts for electric water heater
How to wire tankless electric
How to change water heater temperature using timer
How to change water heater from 240Volt to 120Volt
How to wire thermostats
How to wire water heater for off peak operation

How to twist wire
How to wire Cooper 277
How to wire combo switch-outlet
How to replace 3-speed fan switch

How to wire 3-way switches
How to wire 4-way switches
How to wire TM811 and TM8111 switches
How to wire wall timers
How to wire box timers
How to wire Dayton off-delay timer
How to wire pin timers

How to wire and troubleshoot photo eyes
How to wire switches

Troubleshoot Malibu outdoor lights
Terminals
Select and install wire nuts
Select wire size

Replace breaker
Install subpanel

Electrical formulas
Electricians forum
How to wire GFCI
How to wire GFCI combo

Basic water heater circuit
How to wire water heater for 120Volt
Install old work box

How to drop wire from attic
Romex connector

How to wire 240volt outlets
How to install 3-phase timer
How to wire 3-phase outlets
How to wire 3-phase surge protector
What is 3-phase

How to wire whole house surge protector
How to wire under-counter water heater

See inside main breaker box
Fuseholder
Contactors
How to solder wires
Whole house surge protector
3-phase surge protection
Circuit breakers

Difference between 120 volt and 240 Volt
Difference between 50Hz and 60Hz
How to install electric meter on water heater
How to wire water heater thermostat
How to wire water heater with switches and timers

6x6x4 Enclosures
Intermatic timer enclosures

Gas and electric water heaters Support the economy:
Buy water heaters  from my associate links:

50 gallon Gas water heaters at Amazon
40 gallon gas water heaters at Amazon
50 gallon Electric water heaters at Amazon
40 gallon electric water heaters at Amazon
Hybrid / heat pump/ water heaters at Amazon

Resources:
How to install gas water heater
Troubleshoot gas water heater
Troubleshoot electric water heater
Gas and electric water heaters Industrial electric at Amazon

Industrial supplies at Amazon

Industrial and scientific Amazon
Intermatic control centers Intermatic control centers:
+ manuals and parts


Including Z-wave
box timers Compare box timers

Control with Z-wave
programmable timer Compare programmable timers

Control water heater with programmable wall timer
Countdown timers Compare countdown timers

Control water heater with countdown timer
Compare power packs

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