Blackburn PAE9921-79 AL PARAGRV CLAMP W/CONTAX 2/0-6

The PAE9921-79 covers a 2/0 through 6 conductor range, and it holds two conductors, one in each groove. That range is the whole reason to pick this clamp: it lets you tap a smaller grounding or bonding conductor off a larger run without a separate adapter.

The PAE9921-79 body is aluminum and ships with Contax oxide inhibiting compound already in the grooves, which is what makes an aluminum bolted connector usable on aluminum and on copper-to-aluminum combinations. The inhibitor breaks up the oxide film and keeps moisture out of the joint. If your job spec calls for a copper-bodied connector on an all-copper run, this is not that part.

Bolted, with a 1/2 inch bolt. You tighten it with a wrench, so no hydraulic crimper or die set is needed and the connection can be opened and re-made if a conductor has to be pulled or re-routed. That makes it a practical field splice for a service crew working off a truck.

Allow for a body measuring 2-13/16 inch height by 2-1/4 inch length by 2-3/16 inch width, plus wrench swing on the 1/2 inch bolt head. It is a fair-sized bolted connector, so tight gutter space or a crowded ground bar area is worth checking before you commit to it.

There is no insulation on the PAE9921-79, it is a bare aluminum bolted connector. Treat it as an exposed connection: it needs to sit where the bare metal is acceptable, and any direct burial or concrete encasement use has to be confirmed against your own spec, since insulation and any listing for those conditions are not part of what this clamp provides.

Both join two conductors running alongside each other. The PAE9921-79 does it mechanically, by clamping the two cables into parallel grooves under a bolt, so it is serviceable and needs only a wrench. A compression splice is swaged on permanently with a die and tool and cannot be taken apart. Pick the bolted parallel groove where you want to add a tap later, re-terminate, or work without a crimper on site.

Sold each, so quantity ordered equals clamps received. Worth noting when you are pricing out a grounding grid or a run of service taps, since a job with twenty connections needs twenty pieces ordered.

Order it as Blackburn PAE9921-79. That is the manufacturer part number for the aluminum parallel groove clamp with Contax, 2/0 to 6 range. Country of origin is Mexico if your submittal package asks for it.