B-Line Eaton series wireway, 3" height, 48" length, 3" width, G NK wireway, Thru holes, No knockouts, Screw cover, 1, Steel, Plated screws, ANSI 61 g

The 3348 G NK is a 3 inch by 3 inch cross section, 48 inches long. That 9 square inch interior is the number to use when you calculate conductor fill for a run, and it is the smallest of the common trough sizes, so it suits control wiring and feeder taps in a panel bank rather than a heavy service gutter. The piece weighs 10.224 lb, so one person can set a stick without a lift.

No. The 3348 G NK is a NEMA 1 trough, which is indoor, dry location only. It is screw cover steel with no gasket, so anything exposed to weather, washdown, or dripping oil needs a NEMA 3R or NEMA 4 wireway instead. Keep this one inside mechanical rooms, electrical rooms, and above ceilings in conditioned space.

No knockouts. The NK in the model designation means the body ships blank, so every penetration for conduit or connectors gets punched on site where you want it. If you would rather have factory openings on a repeating pattern, order the knockout version of the same series instead of this one.

The cover is removable and held on with plated screws along its length, not hinged and not a snap latch. That means full access to the whole 48 inch run when you pull it, but you need clearance in front of the trough and a driver in hand each time. On a trough you expect to open repeatedly for troubleshooting, a hinged cover style is less work.

Mounting is by thru holes in the trough body, so you fasten straight through the back into your wall anchors, strut, or backboard. No separate mounting brackets or clips are part of the item, and the fasteners for your substrate are supplied by you. Plan your hole locations against the studs or strut spacing before you set the run.

16 gauge steel, finished in ANSI 61 gray. ANSI 61 is the standard gray used across most commercial panelboards, enclosures, and switchgear, so a run of this trough will read as a match alongside typical electrical room equipment rather than standing out.

The 3348 G NK is CSA Certified. That is the listing carried on this trough, and it is what to put on the submittal for a spec calling for certified wireway. Any other mark your specification requires should be confirmed against the certification actually stated for the part.

Each stick of the 3348 G NK is a straight 48 inch length only. Continuing a run, changing direction, or ending it takes separate 3 x 3 fittings from the same series: couplings to join sticks, elbows or tees for direction changes, and end plates to close the run. Order those alongside the trough, because none of them are included with the straight section.

Go by fill. A 3 x 3 trough like the 3348 G NK gives 9 square inches of cross section, versus 16 on a 4 x 4, so once you are pulling large conductors or stacking multiple circuits through the same gutter the 3 inch trough runs out of room fast. The 3 x 3 makes sense for control and signal wiring, small branch circuits, and tight spaces beside a panel. For feeders, or where you expect to add circuits later, buy the larger section now.

Order it as Eaton B-Line 3348 G NK. The digits carry the size and length (3 by 3 by 48), G is the screw cover gutter style, and NK marks it as the no knockout version. When you are specifying a full run, use that same prefix to keep fittings in the matching 3 x 3 size.