B-Line Eaton series wiring trough, 6" height, 18" length, 6" width, GRT wiring trough, Embossed thru holes, 5 bottom knockouts, Screw cover, 3R, Stee

The 6618 GRT is a NEMA 3R rated wiring trough, so it is built for outdoor use where falling rain, sleet, and ice formation are the concern. That covers exterior walls, rooftops, and service equipment locations. It is not a washdown or hosedown enclosure, so keep it out of locations that need a 4 or 4X type. The screw cover seats against a flange and is held by plated screws, which is what maintains the rain-tight closure.

It is a 6 x 6 x 18 inch trough: 6 inch height, 6 inch width, 18 inch length. That gives a 36 square inch cross section for conductors passing through, which is the number to use against the 20 percent fill rule for wireways. It weighs 9.082 lb empty, light enough for a single-person wall mount.

Mounting is through embossed thru holes in the back of the trough body, so you fasten it directly to the wall, backboard, or strut with your own hardware. Fasteners and mounting brackets are not part of the trough. The embossed holes keep the penetrations raised off the mounting surface, which matters on an outdoor 3R installation.

Yes, there are 5 bottom knockouts in the 6618 GRT. Those give you conduit entry without drilling, but they are all on the bottom face, so plan your raceway approach from below or be prepared to punch the sides and ends yourself. The 16 gauge steel body takes a standard knockout punch cleanly.

A screw cover like the 6618 GRT means every access requires backing out plated screws around a flanged lid. That is the right pick for junction and pull points you rarely open, and for outdoor 3R runs where a positive clamped closure is what keeps weather out. If you are opening the trough regularly for troubleshooting or adding circuits, a hinged cover version saves time. For a pull box you open once at rough-in and again at inspection, the screw cover is fine.

The 6618 GRT carries CSA Certification, so it is acceptable for Canadian installations as well as US work. Order it by manufacturer part number 6618 GRT from Eaton B-Line.

16 gauge steel with an ANSI 61 gray finish, and plated screws for the cover. ANSI 61 gray is the standard gray used across industrial panelboards and control enclosures, so it matches adjacent gear on a typical service or equipment wall without repainting.

Troughs of this type are designed to be coupled end to end, but the 6618 GRT ships as the trough body and screw cover only. Connectors, closure plates, and mounting fasteners are separate items you add to the order. Matching a second 6 x 6 section keeps the cross section consistent at 36 square inches through the run.