B-Line Eaton series bussed gutter and termination cabinets, 800 A, 3R, 10 kAIC, #4 - 600 MCM, 5/16" mounting holes for load lugs, Galvanized, Aluminum

Yes. The R1126 HDD termination cabinet carries a NEMA Type 3R rating, so it is built for outdoor, rain-tight surface mounting on a wall or structure. The enclosure is galvanized steel finished in ANSI 61 gray paint. It is UL Listed.

The line side accepts #4 through 600 MCM conductors, which covers most 800 A feeder runs including parallel sets landed one per lug. The bus itself is rated 800 A, 3 phase 4 wire, so you have a neutral in addition to the three phase bars.

The load side is drilled with 5/16 inch mounting holes for load lugs, so the tap lugs are selected and mounted to suit the circuits you are feeding. Plan on specifying those lugs separately with your order along with the conductor sizes they need to take.

The R1126 HDD is rated 10 kAIC, so the available fault current at the point of installation has to be 10,000 A or less. On a large utility transformer close to the building, available fault current commonly exceeds that, and in that case this cabinet is the wrong choice. Run the fault current study or get the utility figure before you commit.

A plain wireway is just a raceway, you splice inside it. A bussed gutter such as the R1126 HDD carries aluminum bus bar, 3 phase 4 wire, rated 800 A, so one feeder lands on the line lugs and multiple tap circuits are taken off the bus at the 5/16 inch load lug holes. It is the usual way to distribute one service to several disconnects or meters without a full panelboard.

Aluminum bus, inside a galvanized steel enclosure. If your spec calls out copper bus, this one will not meet it. Aluminum bus is standard for gutters and termination cabinets at this rating, but it does mean your lug and antioxidant practice should follow the aluminum connection requirements.

The line connections take two cables per phase, 1/0 to 250 MCM each, which is how you get to the 800 A rating with parallel runs. The lug range on the line side is published as #4 through 600 MCM overall, so a single large conductor per phase is also workable within that range.

No. The R1126 HDD is bussed 3 phase, 4 wire, with four bus runs (three phases plus neutral). It is built for a three phase service. A single phase installation needs a gutter bussed for that configuration instead.