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Resource:: Safe electric wiring
Wall switches are generally rated 120-277 volt AC.
Look for volt and amp rating embossed on the electrical device. Do not exceed rating.
Using 20 Amp switch on a 15 Amp circuit is potentially dangerous. It is acceptable to use 15 Amp switch on a 20 Amp circuit.
For 240 volt applications, use double-pole switch.
For other voltages, such as 480-347-600 volt etc, and for 3-phase applications, use switch or timer to activate contactor.
30 amp switch
Cooper 30 Amp switch
Single-pole/ and 3-way 2-pole on-off switch/ rated 24 amp safe maximum/ rated 120-277 volt.
Can be used for 120 or 240 volt.

Buy:
30 amp 2-pole switch
30 amp industrial grade
Leviton 3033 switch
30 amp 3-way switch
30 amp double-pole

Heavy duty double-pole switches to turn off both hot wires in household 240 volt circuit.
Motor control switch/ single-phase and 3-phase var
Buy:
30 amp motor switch
40 amp motor switch

Resource:
Manual
30 amp DPDT
Double pole double throw 30 amp switch
DPDT switch can be used to toggle between 2 different voltages/ rated 24 amp safe maximum/ rated 120-277 volt.
Can be used for 120 or 240
Rated 120-277. Wiring dia
Buy:
30 amp DPDT switch

Resource:
Use this switch to toggle water heater between 120-240 volt
Ordinary 15-20 amp
single-pole switch
Ordinary 15-20 amp toggle switch.
15 amp device: Safe maximum 12 amps
Usually rated 15 amp for lower quality switches, and rated 120-277V for higer quality.
Do not use 120 volt switch for 240 volt.

Buy:
15 amp switch
20 amp switch
pilot light switch

Indicator light shows when Load is ON.
Rated 120 volt/ safe max 12 amps.

Buy:
Pilot light switch

Resource:
How to wire pilot light switch
GFCI Switch
Combination GFCI
Requires neutral wire. Add GFCI outlet to same box as switch.
Buy:
Leviton Combination GFCI
Combination GFCI  Amazon

Resources:
How to wire GFCI combo
Combination Switch
Combination switch outlet
Requires neutral wire. Add outlet to same box as switch.
Buy:
Combination switch outlet

Resources:
How to wire GFCI combo
3 & 4-way switch
4-way switch

4-way switch is used with two 3-way switches to add more switches to control one light.
Always rated 120-277 volt.
Can be used for 240 volt.
Buy:
4-way switch
Double & triple switch

Multiple switches in one box.

Buy:
Double switches
Triple switches
Center off Switch
Center off Switch
Momentary contact
Use to activate delay timer or sound bell.
Buy:
Center off Switch

Resources:
How to wire delay timer
There are four basic types of switches:
single-pole,
3-way,
4-way 
double pole.

Within this group, there are variations and specialty switches.
Always use correct volt and amp rating for Load (light, fan, motor)
Each switch has a volt and amp rating that is embossed into the plastic or metal. Use correct size wire for amp load

Not shown: commercial 3-phase motor starter switch with 6 terminals. Read about 3 phase vs single phase
Connect wire to screw terminal
Use only 600 volt solid copper wire.
Do not use stranded wire or extension cord.
Do not use solder anywhere on residential 120-240 volt wiring.

Curl end of clean solid copper wire using needle nose pliers.
Securely hook wire under screw. Tighten screw very tight using screwdrive blade that is not too small, but fits the screw head fully.
Brass or black screw is for Black Hot wire. Silver or chrome screw is for Neutral wire. Green screw for Ground.

Use strippers to remove insulation. Do not score or cut into copper wire when stripping wire. Safe electric wiring

Buy tools:
Needle nose pliers
Wire strippers at Amazon
linesman pliersLinesman pliers
Pro linesman plier
End cutting nippers at Amazon
     Use only solid copper wire. Stranded wire will come loose under high amperage load and cause sparks, failure, fire. Use correct size wire for amp load
Attach stranded wire to solid wire using wire connector, then connect solid wire to screw terminal.
Tighten screws very tight against wire. Clean end of wire, then bend a loop using needle nose pliers, and put loop under the screw terminal for maximum hold.
When using quick connects located on back of device, strip wire to length using the strip guide on device, insert wire fully using hand or push using needle nose pliers. After insertion, pull on wire to ensure it is safely held in place. Do not use quick connects for high amperage loads.
Each switch, outlet and other electrical device must be attached to and contained within approved electrical enclosure (box) with a cover to help prevent fire caused by sparks, overheating, and melting. Basic house wiring
Release wire from quick connectQuick connect release
The quick connection can come loose and fail. Causes include damp location, cheap electric device, and outdoor installation with extreme temperature swings.
To release wire from quick connects:
Push small screwdriver into slot next to hole, while pulling on wire > usually takes 3 hands: one to hold device, one to push screwdriver into slot, and one to pull wire. Sometimes the screwdriver needs to be pushed upward or downward to release wire.

Resources:
Timer switch combo .pdf

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
Wire GE 15312 timer 'Old school' wiring works correctly, but is no longer code because white wire carries power.
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
GE 15312 timer wiring Correct wiring.
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.
Location 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

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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.

It is against code to connect 20 amp switch or outlet to 15 amp breaker (white 14 gauge wire) ,,, but ok to connect 15 amp switch or outlet to 20 amp breaker (yellow 12 gauge wire)
2 wires are needed to complete circuit

With 120 volt it takes 1 Hot and 1 Neutral.
The HOT wire is switched ON-OFF. The Neutral wire is not switched.

With 240 volt it takes 2 out-of-phase Hot wires from a double breaker.
Either Hot wire can be switched ON-OFF
or Both Hot wires can be switched ON-OFF

Ground wire not shown.
All Loads (light bulb, fan, motor, etc) and all devices (switches, outlets, timers etc) must be grounded with a bare copper wire that runs continuously back to main breaker box and then outside to ground rod.
The Ground wire cannot be used as a Neutral.
Neutral wire must connect to combo switch.
Neutral is normally two or more white wires covered with wire connector and pushed to back of box.
If box does not have Neutral wire, the Neutral must be brought from any nearby outlet or ceiling box.

Box must have neutral.
Hot wire connects to both switch and outlet on left side of switch.
Neutral wire connects to Outlet on right side of switch.
Load Hot going to light connects to switch on right side of switch.

Basic 120Volt circuit
Resource
Basic house wiring


Timers replace single-pole and 3-way switch
Resources:
Programmable timers
How to wire timers
 Swilight LST 700    
1 switch and 2 lights
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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 installing 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:
Electricity 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 color 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
Buy:
Intermatic ST01c timer at Amazon/ 1 year warranty>
Intermatic ST01 timer
Ei600 5-year warranty timer at Amazon
CR2 replacement battery at Amazon

Resources:
How to program and wire ST01 timer
Load ratings for Intermatic timers/ pdf
Intermatic ST01C & Ei600

Step-by-step installation of contactor 
Figure volts-amps-watts for your water heater

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

More uses for ST01 timer
ST01 timer controls water heater or any 240 volt load
Reverse ST01 using Intermatic air switch   /
Resource
: Intermatic air switches
Use ST01C for 4-way timer
ST01 24 volt DC photoeye
Convert single-pole switch into 3-way switch using ST01/
Resource
: How to add a switch   How to add 3-way switch
ST01 timer controls HVAC
4-way switch
4-way switchesHow 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. Look at device rating. Double pole switches are always 220 or 240 Volts. 4-way switches are always rated 120-277 volt.
: 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
Double switches - With Neutral
How to wire double rocker switchScrew 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 outlet
How to wire double rocker switch to GFCI
Example shows double rocker switch connected to Load screws on GFCI outlet.
If wires are connected to Load screws then rocker switch and lights are GFCI protected.
The Load screws will protect all devices on the line, even if wires continue to several more outlets, switches, lights etc.
**If GFCI protection is not required, then connect rocker switch to Line screws.

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 switchDouble 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

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.
triple Despard switches
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Triple switchesTriple 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 

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 bracket
Despard outlet
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 bracket
Triple switch at Amazon
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 countdown timer is rated enough wattage to control heater.
Double switch controls 2 different lights
Bath fan is controlled by push-button countdown timer.
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, use countdown timer that does no require Neutral.
Resources:
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
Control fan with countdown timer that does not need Neutral wire

All ground wires connect together, and connect to green wires and green ground screws.
Buy Countdown timer does not need Neutral:
PT18M series at Amazon
Resource:
Countdown timer does not need Neutral
How to wire Legrand TM813How 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 switchHow to wire pilot light switch

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.
Leviton pilot light switchIt is out of code, but ground wire connected to silver screw will allow pilot 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 outletCombo switch
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.

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
Buy:
Combination switch outlet at Amazon

Resources:
See 3-way combo switch wiring
How to replace outlet with combo switch
How to wire combo deviceCombo 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 outletGFCI switch combo - requires neutral
Resources:
How to wire GFCI
How to wire arc fault
Buy:
GFCI Combination switch outlet at Amazon


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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
30 amp DPDT switch

For certainty, always Test switch terminals using continuity tester before wiring.
Practical wiring diagram
Wire diagram
DPDT switch

Double pole Double throw
Toggle between 120Volt and 240Volt with center off

Buy double-pole double throw 30 amp
2 DPDT switch with center off at Amazon
2 DPDT switch with center off at Amazon

Resources:
How to wire water heater for 120 Volts
Off peak water heater thermostats
Select correct wire and breaker
Figure volts amps watts for water heater
See inside main breaker box
Two water heaters
How to control motor with two switches

Match watt rating of wiring device with watt rating of appliance.
30 amp device x 80% = 24 amp safe maximum
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:
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 and occupancy 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, white 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
12 amp 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

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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 contactors

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
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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 will 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:
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

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
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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
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3-speed fan switch
Resources
Pass and Seymour 3-speed Fan switch
Z-wave switch Reverse motor with switch Control motor with two switches
How to wire safety switch How to wire transfer switch Override timer with switch
How to add 3-way switch Install switch on pocket door How to wire door switch
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Troubleshoot gas water heater
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Point of use water heaters

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