Electrical Box Knockout Sizes

1 2 to 2 179pm.

Electrical box knockout sizes. 1 2 to 4 154. First determine the size of the missing knockout hole and subtract 3 8 to figure out what size knockout plug you ll need. Knockout type conduit size hole range part number page no. It houses a single electrical switch or outlet and comes in metal or nonmetallic units.

I plan to install a lot of electrical conduit. Knockout holes or knockouts in electrical boxes are made at the factory and have standard sizing to match cable clamps. Hydraulic punch driver straight 90 deg. But sometimes the standard knockout openings in a wall box aren t large enough for the cable clamp or conduit fitting you need to attach to the box so you have to enlarge the hole.

I know that i will need to drill with hole saws or use a knockout punch in junction boxes and the circuit breaker panel. Knockout non metallic push in connector. Different electrical box sizes fit varying installation needs. An example is 1 2 inch 1 3 cm trade size.

I have posted the hole saw and knockout sizes for electrical conduit below. Standard household circuits are either 15 amp or 20 amp and have 14 gauge 14 awg and 12 gauge 12 awg conductors respectively. 1 2 to 2 170pm. 1 2 to 2 157pm.

A standard rectangular shape is the most common electrical box. What are the actual hole saw sizes for the various trade sizes of electrical conduit. These boxes protect wiring from the elements with gaskets sealed seams and watertight covers. 1 1 2 to 2 159pm.

Here are the maximum box fill limits for a few common sizes of electrical boxes. 1 2 to 1 1 4 158pm. 12 awg is larger than 14 awg so a box can have fewer 12 awg conductors than 14 awg. To determine the actual opening for this size you need to add 3 8ths of an inch which is 7 8ths of an inch opening.

Notes to the table above. Trade size in 1 1 2 57 1 1 4 62 1 2 152 1 93 2 1. Electrical boxes conduit fittings. Hydraulic with piece maker.

The 3 4 inch 1 9 cm trade size is a 1 1 8 inch 2 9 cm opening. 1 2 to 2 152.