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main breaker box
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120Volt and 240Volt breakers
Image shows 120Volt line and 240volt line.
Both circuits have ground wire.
Each 120 and 240 require two wires to complete circuit.
120V requires 1 hot and 1 neutral
240V requires 2 hots
Ground wires are for safety.
Resources:
Read more about 240 volt

Some 240Volt lines have additional neutral wire. However, neutral not necessary to complete 240Volt circuit.
Some 240Volt lines have white and black instead of red and black

Most service boxes today have separate Neutral and Ground busbars, but these busbars are bonded together electrically, and are the same.
Illustration on left shows both Neutrals and Grounds on same side of box. In actual box, the Neutral is on right side and ground on left. Illustration shows separated neutral and ground so it is easier to illustrate wires leaving breakers.
Resources:
Color code and wire sizes
Basic 120 volt and 240 volt water heater circuits
How to wire 240 volt outlets
wire switch to outlet 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.
st01 timer Convert switch to 3-way timer
Why are ST01 and Ei600 timers do NOT need neutral wire
Because the timer is battery-operated. Battery lasts 2-3 years.
Replace single pole switch with 3-way switch
Then run wire to new box... install ST01 timer or 3-way switch into new box
ST01 works with any voltage, including low voltage 24 V AC/DC/ or high voltage 208-240-277
ST01 is rated for 1HP motor at 120 volts AC, 2 Hp at 240 Volt AC

Buy:
Intermatic ST01c timer/ 1 year warranty
ST01a almond
Intermatic ST01K combination 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
Load rating for ST01 timer: 120V ac, 6A, 208-277V ac; DC Loads 4A 12V dc, 2A 28V dc; Motors 1HP 120VAC, 2HP

Resources:
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
How to add a 3-way switch
Add outlet Add new outlet
New outlet is added to Any-outlet#1
Add new wire
Run wire to new box
Install ordinary outlet:
Run wire to another new box

Black wire is Hot.> connect to brass screw
White wire is Neutral> connect to silver screw

Code says max 12 boxes per circuit breaker

Resources:
Read pdf
Figure wire size

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 /


Buy:
10-2 gauge/ 30 amp
10-3/ 30 amp
Southwire electric tools
Yellow 12 gauge 20 amp


Yellow/ #12 gauge wire for 20 amp
with ground
Buy:
12-2 gauge/ 20 amp
12-3/ 20 amp

NMB is house wiring
UF is underground
Rolls of stranded wire
White 14 gauge 15 amp


White/ #14 gauge wire for 15 amp
with ground
Buy:
14-2 gauge/ 15 amp
14-3/ 15 amp

NMB is house wiring
UF is underground
armored cable
Buy:
Armored cable
Southwire armored cable cutter
Southwire armored cable cutter
Buy:
Rolls of stranded wire

Stranded wire
stranded wire
Buy:
Rolls of stranded wire
50-60 amp breaker use 6 gauge /
6-2 wire
Buy:
6-2 wire
Southwire electric tools
NMB is house wiring
UF is underground
40-50 amp breaker use 8 gauge /
6-2 wire
Buy:
8-2 wire
Southwire electric tools
NMB is house wiring
UF is underground
    
Copper ground wire
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

Buy
End cutting nippers at Amazon


When removing insulation from wire, do NOT score or put cuts on surface of copper wire. Doing so increases resistances on wire and creates weak point.
Buy tools:
Wire strippers at Amazon
Linesman pliers
Utility knife at Amazon
multimeter
Buy:
Multimeter
Electrical testers
Electricity leaves power plant Resource: Electricity:
The grid is defined by three parts: transmission, distribution and end user. The following links show how it works
Power plant to end user power pole
Power pole to residential breaker box
Power pole to commercial breaker box

How to wire residential electric
How to wire commercial 3-phase

Why you need ground wire
How to wire 3-phase timer
3-phase water heater

Contactors/ relays
Type 1 and type 2 surge protection surge protection
Programmable timers

Woods timers
surge protection
Buy
Electronic parts

Industrial supplies

Tools and home improvement

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Hayward pool
Pentair pool

Southwire electric
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Tools

DEWALT
Black and Decker
Stanley
SKIL
Makita
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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
box timers Resource:
Compare box timers
DPDT timers
Intermatic
Control water heater w/ Z-wave
Intermatic control centers Resource:
Intermatic control centers: and parts
Digital control centers and parts
Tork control centers and parts
Subpanels
All control centers and parts
Enclosures
programmable timer Resource:
Programmable timers
Countdown timers
Off delay timers
On delay timers
Timer modules
Din rail
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Woods
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Low voltage power packs Recirculation systems
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