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4 Way Switches

Power Feed at Fixture - 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 switch locations....

No onward connections are possible from any switch locations because a grounded conductor (neutral) does not exist with this configuration  at these locations.

From the fixture location...

Onward 'always on circuit power' and 'switched power' is possible from the fixture location.

Option 1: Onward Always On Circuit Power...
(showing bellow the fixture portion of the circuit)

Onward Always On 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 (always on state)

* a) Using an insulated wire nut, connect / join - the black wire from 'circuit power supply cable' + the white wire coming from switch 2 (wire cable # 1) + the black wire of onward cable.
* b) Using an insulated wire nut, connect / join - the white wire from 'circuit power supply cable' + the white wire connecting to the grounded conductor (neutral) of fixture (shown as white in diagram) + the white wire of onward cable.

Identification of wires in onward cable....

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

***************

Option 2: Onward switched power...
(example more than one light fixture controlled by the same 3 & 4 way 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 (shown as black in diagram) + the black wire of onward cable.
* b) Using an insulated wire nut, connect / join - the white wire from 'circuit power supply cable' + the white wire connecting to the grounded conductor (neutral) of fixture (shown as white in diagram) + the white wire of onward cable.

Identification of wires in onward cable....

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

**************

Option 3: Onward 'always on' and 'switched' power...
(showing bellow the fixture portion of the circuit)

Onward Always On & 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 (always on and 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 (shown as black in diagram) + the black wire of onward cable.
* b) Using an insulated wire nut, connect / join - the white wire from 'circuit power supply cable' + the white wire connecting to the grounded conductor (neutral) of fixture (shown as white in diagram) + the white wire of onward cable.
* c) Using an insulated wire nut, connect / join - the black wire from 'circuit power supply cable' + the white wire coming from switch 2 (wire cable # 1) + the red wire of onward cable.

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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