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4 Way Switches

Power Source at 3rd Switch - Feed to 3rd 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.

Option 1: 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 3 (wire cable # 1) + the black wire connected to the ungrounded conductor (hot - switched) of fixture + the black wire of onward cable.
* b) Using an insulated wire nut, connect / join - the white wire coming from switch 3 (wire cable # 1) + the white wire connected 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 and 2 locations because a grounded conductor (neutral) does not exist with this configuration  at these locations.

Switch 3 options...

Option 1: Onward always on power...

Onward Always On Power from Switch 3

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 switch electrical box.

Connection Instructions for onward cable (always on state)

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

Identification of wires in onward cable....

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

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

Option 2: Onward switched power...

Onward Switched Power from Switch 3

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 switch 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 # 3) + the black wire coming from fixture (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 coming from  fixture (wire cable # 1) + 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 switched & 'always on' power...

Onward Always On and Switched Power from Switch 3

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 switch electrical box.

Connection Instructions for onward cable (switched &' always on')

* a) Using an insulated wire nut, connect / join - the black wire coming from switch 2 (wire cable # 3) + the black wire coming from fixture (wire cable # 1) + the black wire of onward cable.
* b) Using an insulated wire nut, connect / join the black wire coming from the 'circuit power supply cable' + the black wire connected to the common screw of switch 3 + the red wire of onward cable.
* b) Using an insulated wire nut, connect / join - the white wire from 'circuit power supply cable' + the white wire coming from  fixture (wire cable # 1) + the white 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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