Search
sitemap button
Search using google with ads

 Tweet button  
Page 2 of 3: Wiring diagrams
Return to Page 1:
Overview and buy materials for timer project
Go to Page 3 Wiring details

Resource: safe electric wiring
Personal safety. Always turn power off at breaker. Use non contact voltage tester to check if power is off. Never stand on bare ground or wet or damp surface when working with electricity. Put down dry boards. Tape wood sticks to tester leads to keep hands away from live power. More people are killed by 120 volt than any other voltage. 120-240 volt circuits can kill. Always match wire and breaker size with the rating plate on load (water heater). Use 10 gauge wire and 30 amp breaker for ordinary residential water heater. Make sure all electric connections are made inside enclosure or box. Box must be covered with a plate. Do not use ground wire for the Neutral. Tighten wire connectors and screw terminals very tight against copper wire. Do not use aluminum wire. Solid wire is preferred over stranded wire. Attach all wire to box using connector and secure all wire and conduit to structure.
No Neutral

Larger image
No Neutral
Basic 120-240 volt AC circuit
Understanding the basic 120-240 volt AC circuit is important for electric wiring.

Buy:
ST01 timer/ white or almond

Resource
See inside main breaker box
Basic house wiring
st01 timer
Larger image
No neutral:
This plan is same as shown above and uses Inermatic battery-operated ST01 7-day programmable timer. Suitable for operating contactor. Not suitabe for freezing temperatures due to 12 volt CR2 battery. Replace battery after 3 years.

This installation requires NO Neutral wire, and is maybe the simplist design. Fuse is required: 15 amp fuse.
Same plan works for any heavy-amp load such as heater, motor, pump etc single-phase or 3-phase.

Buy:
ST01 timer/ white or almond
Panel mount fuse holders
Fuse blocks
Ceramic fuses
Indoor 6x6x4 metal pull box
Resource
Go to Page 3 Wiring details
st01 timer
Larger image
No neutral:
This plan uses ordinary 15 amp switch
This installation requires NO Neutral wire, and is simple design. Fuse is required: 15 amp fuse.
Same plan works for any heavy-amp load

Buy;
Panel mount fuse holders
Fuse blocks
Ceramic fuses
Weigman 6x6x4 metal pull box
Buud Industries/ hinged door/ 6x8x4 box 
Resource
Larger image of box with contactor
Go to Page 3 Wiring details
water heater switch
See larger
Use 30 amp switch
Water heater can be turned on-off with 1 or 2 wires
Must be 30 amp switch for 240 volt water heater ... do not use 15 or 20 amp

Buy
30 amp switches

Resource
Wire water heater with switches

Ilustrations on this website made with photoshop elements
Buy:
Photoshop Elements

Neutral Required

Larger image
Neutral Required
Basic 120-240 volt AC circuit
Understanding the basic 120-240 volt AC circuit is important for electric wiring.

Buy:
Programmable timer
Countdown timer
Zwave switch
Wifi switch

Resource
See inside main breaker box
z-wave switch
Larger image
Neutral required:
This plan draws hot and neutral from any outlet box.
Applies to zwave home automation devices.

Buy:
Zwave switch

Larger image
Neutral required:
This plan draws hot and neutral from any outlet box.
Applies to all programmable timers, countdown, wifi and zwave home automation devices.

Buy:
Programmable timer
Countdown timer
Zwave switch
Wifi switch
zwave switch
Larger image
Neutral required:
This plan draws hot and neutral from any outlet box.
Applies to all programmable timers, countdown, wifi and zwave home automation devices.
Rule of thumb: Outlet box will always have Hot and Neutral, Switch box will always have Hot but not always Neutral, Ceiling box with light will always have Neutral but only has Hot when light is on.
Switch box and ceiling box: Neutral wires are usually covered with wire nut and pushed to back of box.

Buy:
Programmable timer
Countdown timer
Zwave switch
Wifi switch

With neutral from different source:

Larger image
With neutral from different source:
Same as illustration shown above except with programmable timer:

Black Hot from fuseholder connects to Timer Black
White wire connecting to one side of contactor connects to Timer Red wire (or blue wire)
Neutral for timer and contactor comes from a independent 120V source

Buy:
Programmable wall timers
Countdown wall timers

Resources
Compare Programmable wall timers and manuals
Compare countdown timers
zwave switch
Larger image
With neutral from different source:
This plan draws Hot from one leg of the 240 volt, and draws neutral from different source.
Use this design when nearest box does not have Hot wire... for example ceiling box always has Neutral but may only have Hot wire when light is on.
Applies to all programmable timers, wif and zwave home automation devices.


Buy:
Zwave hubs
Zwave switch
Wifi switch


Larger-image
Neutral from different source:
Connect Neutral to independent 120V source
Illustration shows how to get neutral from a ceiling box. Example of this would be any box with a light bulb found in the attic, garage, or light controlled by 3-way switch.
Note: the black Hot wire going to light is only hot when light is on. Since it is not continually Hot, it isn't
a reliable power source for the timer and water heater contactor. However the Neutral is always good connection point for another Neutral.

Rules of thumb for residental electricity: Every box with a light has a Neutral but the Hot might be controlled by switch. Every box with a switch has a continual Hot but may not have Neutral. Every box with outlet has reliable Hot and Neutral.

Busman HKP-HH fuse holder

Busman fuse holder/ panel mount/ drill 1/2" hole
Some fuseholders accept terminal connections, some have solder-only connections. 
Fuse blocks have screw terminals.

Buy:
Panel mount fuse holders at Amazon
Fuse blocks at Amazon
Ceramic fuses at Amazon
Fast acting ceramic fuses
Electrical terminals
Solder guns

Resources:
Terminals/
Yellow for 12 gauge/ Blue for 14 gauge
Stranded wire can be crimped to terminal.
How to solder wire to fuseholder or to terminals. Put wire in place. Place hot tip on wire. Wait for wire to heat. Touch solder to hot wire. Solder melts. Withdraw solder. Withdraw hot tip.
Spring-wound timers
Same wiring applies to ordinary 15-20 amp wall switch

Require NO neutral wire
Variety of times 15 minute to 12 hour
Connect black and white wires to either connection point on timer.
Make sure ground wire wraps of connects to metal fins on timer for proper grounding
Same wiring applies to ordinary 15-20 amp wall switch/ connect either wire to either brass-colored screw on switch, and connect bare ground wire to green screw

ResourceeAll brands spring wound mechanical timers
Ordinary 15-20 amp switches

hand Go to Page 3: wiring details




Buy
Tools
Milwaukee
DEWALT
Black and Decker
Stanley
SKIL
Makita
Porter-Cable
Bosch

Irwin Hand tools
Klein hand tools
Fluke electrical testing
Dremel hobby tools

Campbell Hausfeld air powered
Tekton automotive

Powerbuilt automotive
Saws and saw blades

Buy from my affiliate links every time/ thanks:
Amazon
''As an Amazon Associate I earn from qualifying purchases''
Enter Amazon from any link on my site, fill cart with any item ... purchases pay small commission

E-mail: geno03245w@gmail.com
My response might end up in spam folder, check email folders
Waterheatertimer on Twitter
Message thru facebook