How to wire a garden shed

Les Hutchins

The convenience of electrical sockets and lighting in your garden shed is easy to imagine. You'll have a place to plug in rechargeable tools, power electric yard tools like trimmers and hedge cutters, and sufficient lighting inside so you don't bang your head or stub your toe.

Decide the best route to deliver power to the shed. Tap into an existing exterior outlet or add a new circuit for the shed.

Notice this junction box has plenty of room in it, even with all the wires. Don't overcrowd an electrical box.

Dig a trench, 18 to 20 inches deep and lay the underground cable. Bring the cable up through the floor plate of the shed wall and into a junction box secured to the wall. Fill the trench once the cable is laid.

Determine where you want the outlets, light switch and light. Install each box with screws or nails.

Run sheathed cable from the junction box to your interior outlet box. From there, run to your exterior outlet box and to your light switch. Lastly, run the cable from your light switch to the light fixture box. Avoid having more than three cables enter or exit from any one box. An y more and your box will be too full.

Fasten the cable within 18 inches of each box. Strip the outer sheathing from the cable, leaving a quarter inch protruding inside the box. The insulated wires should protrude from the box at least six inches.

This junction box has a number of connections. Notice the twisted copper ready for a wire nut.

Make your connections. For each, strip 3/4 of an inch of insulation from the white and black wires. In the junction box, use the side cutter to twist ground wires together and cap with a wire nut. Do the same with the stripped ends of the white and black wires. Connect white to white and black to black. Put a cover on the junction box when you are finished.

Wire the outlets. For each, form a bare terminal loop in the copper wire. Fasten the white wire to the silver terminal on the outlet. If a second wire leaves the box, wire that one to the outlet as well. Be sure to twist together the ground wires and fasten them to the ground lug as well.

Wire the light fixture by attaching the white cable wires to the fixture wires using wire nuts, or attaching the cable wires to the fixture terminal screws. Put the fixture in place on the box. At the switch, attach the black wire from the fixture to one terminal on the switch. Attach the other black wire to a switch terminal as well. Twist the two white wires together and cap with a wire nut. Be sure to connect the ground wires.

Connect the underground cable to your power source. Be sure to turn the power off first. Once connected, turn the power on and test your work.

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