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House Electrical Wiring Diagrams:
Wiring Connections in Switch, Outlet, and Light Boxes

The following house electrical wiring diagrams will show almost all the kinds of electrical wiring connections that serve the functions you need at a variety of outlet, light, and switch boxes. It gives you over 200 diagrams. For help understanding them, be sure to open the Explanation page. Also consider taking the Connections Tutorial or seeing the Typical circuit diagram.

EXTENSIVE   Box-and-Cable Connection Diagrams

  1. How many separate cables (not wires) come into the box for your outlet, switch(es), or light?
  2. How many wires are in each of these cables (don't count grounds, which are bare or green)?
According to your answers to these questions, open this Explanation and click the appropriate diagram:

Hooking up a single romex- thumbnail
-Only one 2-wire (flat) cable ["14-2" or "12-2"]

Red wire in a cable- thumbnail
-Only one 3-wire (round) cable ["14-3" or "12-3" (w/red wire)]

Two black and two white wires- thumbnail
-Two 2-wire cables

Two black, two white, one red wire- thumbnail
-One 2-wire cable and one 3-wire cable

Two circuits in one box- thumbnail
-Two 3-wire cables

Hook up three romex in a box- thumbnail
-Three 2-wire cables

Two flat and one round electrical cable- thumbnail
-Two 2-wire cables and one 3-wire cable

Two red wires in an outlet box- thumbnail
-One 2-wire cable and two 3-wire cables

Wire connections for three round cables- thumbnail
-Three 3-wire cables

How to connect four romex- thumbnail
-Four 2-wire cables

Several romex cables to hook up- thumbnail
-Three 2-wire cables and one 3-wire cable

[Be sure to open the Explanation (new window) to understand the functions of the cables.]

© 2009-2013 Larry Dimock

Connections Tutorial
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