B-Line Eaton series wiring trough, 8" height, 48" length, 8" width, GRT wiring trough, Embossed thru holes, 15 bottom knockouts, Screw cover, 3R, Ste

The 8848 GRT carries a NEMA 3R rating, so it is built for outdoor use where rain and sleet are the concern. NEMA 3R is rainproof, not watertight and not dust-tight, so it is not the right box for washdown areas or for hose-directed water. Steel construction with an ANSI 61 gray finish, and it is CSA Certified.

It is an 8 x 8 inch cross section running 48 inches long. Wireway fill under the NEC is limited to 20 percent of the interior cross-sectional area, so size your conductor bundle against that 8 by 8 opening rather than filling it up. The 48 inch length is the standard stick length for tying two panels or disconnects together in a row.

There are 15 bottom knockouts already provided, so conduit entries into the bottom of the trough can be made without punching steel on site. Any other entry point, top, side, or end, you punch yourself. Conduit connectors and locknuts are separate.

It is a screw cover, not a hinged one. The cover is held by a flange and plated screws, so you back the screws out and lift the whole cover away to pull or dress conductors. Plan enough clearance above the run to remove the cover, and budget a few minutes per section if you expect to open it often. If you need frequent access, a hinged-cover trough is the easier choice.

16 gauge steel is the usual body thickness for a trough this size and holds its shape across the 48 inch span without oil-canning when the cover screws are pulled down. It is a painted steel enclosure in ANSI 61 gray, which is the standard switchgear gray, so it matches panelboards and disconnects on the same wall. For corrosive or coastal environments, specify a stainless or non-metallic wireway instead.

Order it as B-Line (Eaton) 8848 GRT. The number reads off the dimensions: 8 inch height, 8 inch width, 48 inch length, GRT series. Sibling sizes in the same series follow the same convention, so an 8 x 8 x 24 would be an 8824, which matters when you are matching an existing run.

GRT troughs are made to be coupled end to end, and the 48 inch section is the building block for a longer run. What ships is the trough body and its screw-on cover with the plated screws. Connectors or couplers for joining sections, closing plates for the open ends, conduit fittings, and mounting hardware are all ordered separately, so count those when you are pricing the job.

A GRT wireway is meant for routing and for making splices and taps inside it, with the cover removable for access, which is exactly why it is used between panels and motor starters instead of a chain of junction boxes. What it is not is a cabinet for mounting breakers or controls. With the 3R rating it can take an exterior wall; for indoor-only runs a 1 or 3R trough both work, but 3R gives you the outdoor option without changing part numbers.