B-Line Eaton series wiring trough, 12" height, 24" length, 12" width, HS wireway, Thru holes, 7 top knockouts, 7 bottom knockouts, Hinged cover, 1, S

It's a 12 by 12 by 24 inch trough: 12 inch height, 12 inch width, 24 inch length. That 12 x 12 cross section is the large end of standard wireway sizing, so it handles heavy multi-circuit pulls and gives room to train conductors around splices rather than forcing bends. The 24 inch length is a short run section, typically used as a pull or gutter box between panels rather than a long horizontal raceway.

Hinged. The HS designation on this Eaton B-Line trough is the hinged screw cover style, so the cover swings open and stays attached to the body while you pull or land wire. The cover is secured to the body with plated screws, so it still closes down tight once the work is done. If your install needs the cover fully removable for overhead access, a screw cover (non-hinged) trough is the better choice.

It ships with 7 knockouts on the top and 7 on the bottom, so you can bring conduit in and out without punching the sheet steel in the field. There are no knockouts listed on the ends of the 121224 HS, so if you need to couple trough sections end to end you'll be cutting or using a connector kit for that joint.

14 gauge steel, painted ANSI 61 gray. That's the standard gray used on commercial panelboards, switchgear, and enclosures, so a run of this trough matches existing electrical room equipment rather than standing out. The 14 gauge body is heavy enough to stay rigid over a 24 inch span without bowing when loaded with conductors.

The 121224 HS carries CSA C22.2 certification, which is the Canadian standard set inspectors look for on electrical enclosures. That covers the enclosure itself; the installation still has to follow the Canadian Electrical Code for fill, support spacing, and location.

A hinged screw cover trough like the 121224 HS is for gutter and pull applications where you open it occasionally for splices, taps, or terminations, then screw it shut. Lay-in wireway with a removable or quick-latch cover is better where you're laying long runs of conductor in from the side along a whole wall and want the full length open at once. For a 12 x 12 box between two panels that gets opened during service, the hinged version is the easier one to work in, since the cover doesn't have to be held or set down.