Large Junction Box Size

Suppose you have a 2 inch raceway coming into a 10 inch square box and a 2 inch raceway leaves it on the opposite side.

Large junction box size.

Use 314 28 a to size pull boxes junction boxes and conduit bodies when using conductor sizes 4 awg and larger. Plus one universal electrical wall box 1 gang 10 cu. A junction box with only straight pulls containing spliced 4 awg or larger conductors must comply with the minimum size requirements of 314 28 a 1 and a 2. Hfa1212chnfss j box type 4x hinged cover bulletin a51s stainless steel junction boxes size dims.

Typical 4 inch electrical boxes used for single or more often duplex electrical receptacles. Old work electrical box 1 2 3 4 gang. Installing a junction box that is too small is illegal and unsafe. You may have to opt for a deeper or larger box to accomplish the splicing you have planned.

Depending on what sized wire how many wires are in a given box and the number of wire splices in that box you may need a little more room than a standard box can give you. Below left we show a typical 4 inch metal junction box and below right a common and deeper plastic junction box. A box containing only straight pulls that is calculated by the straight pull method could be too small if there are spliced conductors in the junction box.