X, C and U Exclusions
Exclusions to Property Liability forms aimed principally at contractors and excavators. The exclusions deny payment for loss due to Explosion (X), Collapse (C) or Underground Damage (U). Explosion includes property damage arising from blasting or explosion. Collapse includes structural property damage and property damage to any other property rising out of grading of land, excavating, burrowing, filling or backfilling, tunneling, pile driving, coffer dam or caisson work, moving, shoring, underpinning or razing/demolishing any building or structure. Underground damage includes damage to wires, conduits, pipes, mains, sewers, tanks, tunnels, any similar property beneath the surface of the ground or water caused by and occurring during the use of mechanical equipment for the purpose of grading land, paving, excavating, drilling, burrowing, filling, backfilling, or pile driving.

