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4 Way Switches

Power Source at 2nd Switch - Feed to 2nd Switch

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Extensions to this Switch circuit...

Be Aware that there is a limit by code on how many wires can be in a given size electrical box, when adding more wires to the same box you may have to install a larger and / or deeper box to allow space for more wires coming and out of the box.

Here is an article / explanation in regards to box fill calculations (on our sister website 'Wiring Done Right') 'Box Fill Calculation'

The instructions here are based on the fact that the circuit has already been wired to the configuration shown in this article and we are now making the wiring changes for onward power.

From the fixture location...

Only switched onward power is available from the fixture location.

Onward switched power...
(example more than one light fixture controlled by the same switches)
(showing bellow the fixture portion of the circuit)

Onward Switched Power from Fixture

Not shown in the diagram but the onward cable also has a bare wire (equipment grounding conductor) that also must be connected to all the other bare wires at the fixture electrical box.

Connection Instructions for onward cable (switched)

* a) Using an insulated wire nut, connect / join - the black wire coming from switch 2 (wire cable # 1) + the black wire connecting to the switched ungrounded conductor (hot) of fixture + the black wire of onward cable.
* b) Using an insulated wire nut, connect / join - the white wire coming from switch 2 (wire cable # 1) + the white wire connecting to the grounded conductor (neutral) of fixture + the white wire of onward cable.

Identification of wires in onward cable....

Black - Switched ungrounded conductor (hot - switched)
White - Grounded conductor (neutral)

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From the switch locations....

No onward connections are possible from switch 1 or 3 locations because no grounded conductor (neutral) is available at these locations.

Switch 2 options...

Because of the number of wires depicted at switch 2 in this design  I have decided to not create a drawing but just to make connection instructions for switch 2 onward options...

Option 1
: Onward always on power...

Connection Instructions for onward cable (always on state)

* a) Using an insulated wire nut, connect / join - the black wire from 'circuit power supply cable' +  the black wire coming from switch 1 + the black wire of onward cable.
* b) Using an insulated wire nut, connect / join - the white wire coming from fixture + the white wire coming from 'circuit power supply cable' + the white wire of onward cable.

The onward cable also has a bare wire (equipment grounding conductor) that also must be connected to all the other bare wires at the switch 2 electrical box. 

Identification of wires in onward cable....

Black - Ungrounded conductor (hot - always on)
White - Grounded conductor (neutral)

********

Option 2: Onward switched power...

Connection Instructions for onward cable (switched)

* a) Using an insulated wire nut, connect / join - the black wire from  fixture + the black wire coming from switch 3 + the black wire of onward cable.
* b) Using an insulated wire nut, connect / join - the white wire coming from fixture + the white wire coming from 'circuit power supply cable' + the white wire of onward cable

The onward cable also has a bare wire (equipment grounding conductor) that also must be connected to all the other bare wires at the switch 2 electrical box.

Identification of wires in onward cable....

Black - Switched ungrounded conductor (hot - switched)
White - Grounded conductor (neutral)

***********

Option 3: Onward 'always on' and 'switched' power...

Connection Instructions for onward cable (always on and switched)

* a) Using an insulated wire nut, connect / join - the black wire from  fixture + the black wire coming from switch 3 + the black wire of onward cable.
* b) Using an insulated wire nut, connect / join - the black wire from 'circuit power supply cable' +  the black wire coming from switch 1 + the red wire of onward cable.
* c) Using an insulated wire nut, connect / join - the white wire from fixture + the white wire coming from 'circuit power supply cable' + the white wire of onward cable

The onward cable also has a bare wire (equipment grounding conductor) that also must be connected to all the other bare wires at the switch 2 electrical box.

Identification of wires in onward cable....

Black - Switched ungrounded conductor (hot - switched)
Red - Ungrounded conductor (hot - always on)
White - Grounded conductor (neutral)

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