Typical 4 inch electrical boxes used for single or more often duplex electrical receptacles.
Large junction box size.
Plus one universal electrical wall box 1 gang 10 cu.
Junction boxes come in many shapes and sizes.
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.
Hfasg24x24x12nk pull box screw cover bulletin a90p1 pull boxes type1 size dims.
Old work electrical box 1 2 3 4 gang.
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.
You may have to opt for a deeper or larger box to accomplish the splicing you have planned.
Use 314 28 a to size pull boxes junction boxes and conduit bodies when using conductor sizes 4 awg and larger.
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Below left we show a typical 4 inch metal junction box and below right a common and deeper plastic junction box.
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.