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Electrical Boxes & Conduit

Junction and device boxes, weatherproof outdoor boxes and covers, mounting brackets, and flexible conduit with fittings.

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Junction and device boxes, weatherproof outdoor boxes and covers, mounting brackets, and flexible conduit with fittings.

What to compare

  • New work or old work. New-work boxes nail to open studs; old-work (remodel) boxes clamp to finished drywall.
  • Gang count and depth. One gang holds one device. Deeper boxes give the cubic-inch volume needed for more conductors and for GFCI or smart devices.
  • Outdoor use. Look for a weatherproof box and an in-use cover for receptacles that stay plugged in.
  • Conduit trade size. 1/2 in and 3/4 in are common; liquid-tight flexible conduit is used for outdoor equipment such as AC condensers.

Related: wire and cable and outlets and switches. See the wire gauge chart.