B-Line 18156 SCGV NK Eaton series Type 1 junction boxes

The 18156 SCGV NK enclosure measures 18 inches high, 15 inches wide and 6 inches deep, which is where the catalog number comes from. That 6 inch depth is what decides whether you have room for wire bending space behind a terminal strip or a small DIN rail assembly. It weighs 15.8 lb empty, so a single person can hang it but you want the anchors sized for a loaded box.

No. The 18156 SCGV NK carries a NEMA Type 1 rating, which is indoor use only, for protection against incidental contact with the enclosed equipment and falling dirt. It offers no protection against rain, hose-down, dust ingress or corrosive liquids. For an exterior wall, a loading dock, or anywhere that gets washed, you need a NEMA 3R, 4 or 4X enclosure instead.

No. The NK in the catalog number means no knockouts, so the 18156 SCGV NK ships as a blank galvanized steel box and you punch your own conduit entries exactly where the run lands. Plan on a knockout punch set or hole saws and the right connectors and bushings for the conduit you are bringing in. If you would rather have factory entries, order the knockout version of the same size box.

The cover is screw attached with plated screws, and it has keyhole slots so you can back the screws out part way and lift the cover off the heads rather than holding a 15 by 18 inch panel while you chase loose hardware. That is the detail that matters when you are working off a ladder alone. It is a screw cover box, not a hinged door, so figure on a screwdriver or nut driver every time you need access.

Surface mounting, through thru holes in the back of the enclosure. You anchor it directly to the wall or a backing plate, so it is not designed to be recessed into a stud bay or flush mounted into drywall. Bring your own fasteners sized to the substrate, concrete anchors for masonry, and account for 15.8 lb before conductors go in.

It is built to UL 50, the standard covering enclosures for electrical equipment, and carries the Type 1 rating under it. Made in the US. For an inspector asking what the enclosure is listed to on an indoor commercial or industrial job, UL 50 Type 1 is the answer.

It is unfinished galvanized steel in 16 gauge, grey in appearance, with no paint on it. The galvanizing gives it reasonable resistance in a dry indoor mechanical room, but it is a Type 1 box and not intended for wet or corrosive locations. If you want a painted finish to match other gear on the wall, this is not the one, and if the space sees condensation or washdown, step up to a gasketed 4 or 4X enclosure.

16 gauge galvanized steel is the typical body weight for a medium single door screw cover enclosure of this size and it holds its shape under normal handling and conduit loading. It is not an impact enclosure. If the box sits where a pallet jack or forklift can catch it, mount it above traffic height or put a guard in front of it rather than relying on the wall thickness.