Steel City SPJ-3 SPJ3

The SPJ-3 is a non-metallic box, finished in black. That matters on the job because a non-metallic enclosure won't corrode the way a steel box does in damp or coastal exposure, but it also means the box itself is not part of your equipment grounding path. Any grounding conductors have to be joined inside the box with a ground splice or pigtail rather than bonded to the enclosure.

It's built as a weatherproof junction box, so it's intended for exposed exterior and damp-location splices rather than dry interior work only. It carries UL file E63648. Pair it with listed weatherproof fittings and gasketed cover hardware so the openings stay sealed, since the box only performs to its rating if the entries are made up with compatible weatherproof connectors.

Order it as Steel City SPJ-3 (also written SPJ3). That's the manufacturer part number, and it's a single-model item, so there are no finish, size, or knockout variations to specify on the order line.

Country of origin on the SPJ-3 is the United States, which is what institutional and government buyers working under domestic-sourcing requirements usually need confirmed before the submittal goes through.

The SPJ-3 is a weatherproof junction box, intended for enclosing and protecting conductor splices at exterior and damp locations. If you need to hang a luminaire or a ceiling fan from the enclosure, that requires a box specifically listed for fixture or fan support, since a general junction enclosure carries no such support listing.

The SPJ-3 is sold each, so the quantity you enter is the number of boxes you receive. For a multi-unit job, just multiply by the number of splice points rather than ordering by case.