Home Wiring 4 - Rough In and Box Replacement
Roughing In
Margin of Error: 1/4"
Junction boxes for outlets, switches and lights are "roughed in" before the fixtures themselves are installed.
Tip: If the box you wish to extend from has reached its capacity and you cannot find a second one from which to run the new cable, simply replace the box with a larger and deeper one.
Placing the Boxes
Margin of Error 1/4"
Choose the correct junction boxes (where two or more wires are joined together) for your needs. Check your electrical code for local recommendations. They should be UL approved and have the right dimensions to hold the wiring, outlets, and connectors you will be using.
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Use a ruler or other object of appropriate length (screwdriver) to rest the boxes on when establishing installation points. Assure that your boxes will be flush with final wall covering by holding a small piece of the covering (i.e., drywall or paneling material) between the box and wall stud while attaching the box. Check code for height at which to install switch boxes.
Remove the knock out (s) in each box in the direction of the most efficient route for the cable to run.