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How to change 120 Volt subpanel to 240 Volt subpanel



Buy indoor/ outdoor:
120-240 Volt
70 amp 2-space
60-100-200 amp 2-space
Subpanels at Amazon
Use for 20 amp, 30 amp, 40 amp Up to rated amps


Buy indoor/ outdoor:
120-240 Volt
125 amp 8-space
Subpanels at Amazon
Up to 125 amps


Buy indoor
120-240 Volt
100 amp 8-space
Subpanels at Amazon
Up to 100 amps

Buy indoor:
120-240 Volt
125 amp 8-space
125 amp 8-space
Subpanels at Amazon
Up to 125 amps


Buy indoor:
120-240 Volt
125 amp 8-space
Subpanels at Amazon
Up to 125 amps
Intermatic T30000R5
Subpanels with space for breakers, timers, switches, outlets/ 120-240 Volt
Buy indoor/ outdoor:
60-125 amp 4-8-spaces
single-pole breaker
Push down breaker
Plug-in breakers
Fits residential panels
Fits subpanels above
Buy single-pole:
Siemens 15-60 amp

Single-pole tandem breaker
double-pole breaker
Push down breaker
Plug-in breakers
Fits residential panels
Fits subpanels above
Buy double-pole:
Siemens 15-60 amp
3-phase subpanel
3-phase subpanel
Not residental
Buy:
24 space 125 amp
24 space 125 amp
NOT residential
3-pole breakers
Resource:
3-phase Wiring

Buy:
10-2 gauge/ 30 amp
10-3/ 30 amp

NMB is house wiring
UF is underground

Buy:
12-2 gauge/ 20 amp
12-3/ 20 amp

NMB is house wiring
UF is underground

Buy:
14-2 gauge/ 15 amp
14-3/ 15 amp

NMB is house wiring
UF is underground

How to install 1" wide push-down breaker

Push-down breaker
Notch on breaker sits against rail or cleat
Rotate breaker down to busbar
Push breaker down over vertical busbar

BR type 1" wide breakers are usually used for residential applications
Available local box store
Buy single-pole:
Siemens 15-60 amp

Buy double-pole:
Siemens 15-60 amp
120 Volt subpanel
Larger image

Step 1) Identify basic 120 Volt subpanel


Step 2) Identify if other 120Volt outlets and switches are on that circuit

Identify single pole breaker supplying power to 120V subpanel
Turn breaker OFF, and check which outlets and switches are on that breaker
The change-over to 240Volt will NOT work if other outlets and switches are located between subpanel and main breaker box... unless a dedicated wire is installed from subpanel to main breaker box
120 Volt subpanel

Step 3) 120 volt subpanel wiring

By code, White wire is Neutral
Black is Hot

240 Volt subpanel

Step 4) Change to 240 volt subpanel

Add black tape to White wire that carries voltage
240 Volt subpanel
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Step 5) Change wiring in main breaker box

Identify single pole breaker supplying power to 120V subpanel
Install 240V breaker
By code, the 240V breaker must be a single connected breaker, and not two 120V breakers.
Move black wire on single-pole breaker to new 240V breaker.
Move white neutral to new 240V breaker
Add black tape to white wire that carries voltage

240V Subpanel will NOT work for 120Volt breakers since ground wire cannot be used as Neutral

120 Volt is NOT available with this diagram
Single-pole 120V breakers can be installed, but it is against code to use Ground wire as Neutral

Wires cannot be over the top of breakers or busbars

Wires cannot lay over the breakers or busbars.
Wires can lay over top of other wires, but not at point where wires connect to busbars.
Lay all wires to sides of box
120 volt and 240 volt subpanel
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120 volt and 240 volt subpanel

3 wires plus ground wire between subpanel and main breaker box


Install subpanel for Tankless electric
Larger image

More subpanel wiring

Square D transformer
Larger image
Convert 240Volt to 120Volt without neutral wire from breaker box
Buck-boost transformers buck voltage down, or boost voltage up. This transformer bucks down voltage.
Convert 240Volt to 120Volt without neutral wire from breaker box.
Convert 480Volt to 240Volt or 120Volt
Type 3R outdoor enclosure

Wiring:
480Volt input connects to H1 H4, and then H2 and H3 are connected together
240Volt input connects to H1 H4, and then H3 connects to H1, and H2 connects to H4

240Volt output connects to X1 X4, and then X
2 and X3 are connected together
120Volt output connects to 
X1 X4, and then X3 connects to X1, and X2 connects to X4

Buy:
Square D transformers at Amazon

Resources:
Match wire and breaker size
How to wire a subpanel
Read about household single-phase electricity
Read about 3-phase
How to wire 3-phase timers
linesman pliers

front cutting pliers
Utility knife

Electric tools:

Buy:
Linesman pliers

Buy:
Wire strippers at Amazon

Buy:
Crescent-brand end cutting nipper at Amazon
End cutting nippers at Amazon

Buy:
Utility knife at Amazon


Household NM-B Wires are color-coded so inspectors/ electricians can easily identify which wire is used during construction

Match wire size and breaker amp rating

If your home was wired by professional electrician who pulled permits, then circuit breaker and wire size will match. If manufactured home or travel trailer has not been altered by homeowner then breaker and wire size will match.

If breaker is oversized for wire... fire danger

Breaker can let too much electricity travel through the wire. Wire can overheat and cause fire.
Call electrician if you suspect wiring is not correct,
Absolute electrocution danger when removing cover off main panel. More information below.
Main breaker terminals are still Hot when main breaker is turned off.

Buy:
Southwire Romex® wire at Amazon

Resource:
How to replace circuit breaker

How to figure correct size wire and breaker

Use chart on left to select wire and breaker (for short lengths of wire)
Use the 80% rule when calculating Capacity.
wattage shown on chart shows the 80% rule.
When wires and breakers operate at 100%, they get warm.
Warm wires mean amp loss and potential fire hazard.
Warm breaker means that breaker will not last as long, and busbar can be damaged by heat (over period of time)

14 ga wire ++  rated for 120 Volts x 15 Amp = 1800 Watts x 80% = 1440 Watts safe maximum

12 ga wire ++ rated for 120 Volts x 20 Amps = 2400 Watts x 80% = 1920 Watts safe maximum

10 ga wire ++ rated for 240 Volts x 30 Amps = 7200 Watts x 80% = 5760 Watts safe maximum

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

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Resources:
How to install gas water heater
How to install electric 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
box timers Compare box timers

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All control centers and parts

Including Z-wave
programmable timer Compare programmable timers

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