Blackburn PAE3921-79-2 AL PARAGRV CLAMP W/CONTAX 397-3/0

The PAE3921-79-2 is built for a run range of 397 kcmil down to 3/0, as reflected in the 397-3/0 designation in the part description. It is a two-conductor clamp, so it joins one run to one tap within that range.

The body is aluminum, which is what the AL in the part description refers to. Aluminum-bodied parallel groove clamps of this kind are used for aluminum-to-aluminum connections; for a copper run you want a copper or bronze bodied clamp instead.

It is a bolted connection, not compression, so no crimp tool or die set is needed. The clamp uses a 1/2 inch bolt, so bring a socket or wrench sized for that head.

The clamp measures 2-9/16 inch height by 1-5/8 inch length by 2-1/4 inch width, with a 1/2 inch bolt. Check that against your gutter, pull box, or ground bar space before you commit, since the bolt head also needs wrench swing.

It ships bare with no insulation on the clamp itself. Any covering required for your application, tape, a boot, or a cover, has to be supplied separately.

A parallel groove clamp like the PAE3921-79-2 is a bolted mechanical tap. Pick it when you want a connection you can make with hand tools and take apart later for testing or re-taps. A compression splice is the alternative when you need a permanent, irreversible joint, and it requires the matching crimp tool and dies. This part is catalogued against wire or cable compression splice applications, but the connection itself is bolted.

Each. One clamp per unit, so order the exact count of taps you are making plus spares.

Manufacturer part number PAE3921-79-2, Blackburn brand, made in Mexico. Use that full part number when matching to a bill of material, since the trailing digits set the conductor range.