Blackburn GUV21225 U-BOLT GROUND CLAMP 250-2/0

The GUV21225 U-bolt ground clamp is rated for grounding conductors from 250 kcmil down to 2/0, so it covers the heavy service-entrance range rather than small branch-circuit grounds. If your ground wire is smaller than 2/0, you need a smaller clamp in the same U-bolt family.

It carries UL file E3060 and CSA 12798, which is what an electrical inspector looks for on a grounding connector. That listing is the reason this clamp gets accepted on service grounds in commercial and institutional work.

Yes. The conductor material for this clamp is listed as copper, so it is intended for copper grounding conductor connections. Don't substitute it for an aluminum-rated connector without confirming the connector is marked for that conductor.

Allow for 4-15/16 inches of net length on the GUV21225 body. In tight gutters or behind a meter base, measure that clearance before ordering, because a U-bolt style clamp needs room for the bolt legs and the nuts to be turned down.

A U-bolt clamp like the GUV21225 clamps the grounding conductor down against a bar, rod, or pipe with a U-bolt and nuts, giving a mechanical compression connection you can install with hand tools and no crimper or exothermic kit. For direct water-pipe bonding you would typically use a pipe-specific ground clamp sized to the pipe diameter; use this style where a U-bolt around the ground element is the practical connection.

No insulation. It is a bare mechanical grounding clamp, so any required protection or separation from adjacent live parts has to come from the enclosure or from field-applied means.

Sold each, one clamp per unit, so you can order exact counts for a service upgrade instead of buying a carton. Model number for ordering is GUV21225.