Blackburn PAA4009 AL PARAGRV CLAMP 1-2BOLT 400-1/0 OI

The PAA4009 covers a run of 400 through a tap of 1/0, as its 400-1/0 designation indicates, and it clamps two conductors in the parallel grooves. It is a bolted connector, not a compression fitting, so the conductors are seated in the grooves and torqued down rather than crimped.

The PAA4009 body is aluminum. Aluminum-bodied parallel groove clamps are made for aluminum conductor runs and taps; putting bare copper against bare aluminum in an outdoor or damp location invites galvanic corrosion, so for copper-to-aluminum work use a connector specifically rated dual-metal (AL9CU) instead. If your run and tap are both aluminum in the 400 to 1/0 range, this is the right family of part.

Bolt size is 1/2 inch with a 3/4 inch bolt head, so a 3/4 inch socket or wrench drives it. The clamp uses two bolts, so plan on tightening both evenly to seat the conductors in the grooves.

Overall it measures 3-1/4 inch height by 3-3/4 inch length by 2-1/2 inch width, and you need swing clearance beyond that for a 3/4 inch socket on each bolt. Worth checking before you commit it to a tight pull box or a crowded pedestal.

It ships bare, with no insulation on the body. Any insulating or re-jacketing of the splice, tape, mastic, or a cover, is a field step you supply, so add it to your material list if the location calls for it.

A parallel groove clamp lays the two conductors side by side in machined grooves and bolts them together, so it makes a tap or a parallel splice rather than an end-to-end butt joint. The PAA4009 is catalogued as a wire or cable splice connector for two conductors. If you need a straight in-line splice on a single run, use a compression sleeve instead.

Sold individually, one clamp per unit, under manufacturer part number PAA4009. Country of origin is the United States, which matters if you are working a Buy American or federally funded job.