CONCORD, N.H. — The U.S. Labor Department’s OSHA proposed more than $280,000 in fines against contractors working on a power plant in Berlin, N.H., including a Lewiston-based electrical contractor.

OSHA said workers on the site were exposed to serious and potentially fatal injuries from cave-ins, falls, scaffold collapses, crushing, lead and electrocution hazards. No one was killed or seriously hurt.

General contractor Babcock & Wilcox Construction Co. Inc. of Barberton, Ohio, faces more than $116,000 in fines. OSHA said the company was cited for using cranes on unstable ground; failing to train workers adequately to install fall-protection systems; not keeping work areas clear of debris; and more.

Ryan Cornell, a spokesman for Babcock & Wilcox, says the company disagrees with the findings but will work closely with OSHA to resolve the issues.

Northeast Utilities Enterprises, doing business as E.S. Boulos Co., of Lewiston, installed the primary electrical wiring and transmission lines. OSHA issued the company one serious citation with a $5,000 fine for exposed live electrical wiring, unlabeled electrical panels and not closing unused electrical cabinet openings effectively.

Other subcontractors fined are in Pittsburgh and Mt. Morris, Pa.; Roanoke, Va., and Berlin.