Equipment breakdown, historically called boiler and machinery coverage, can address a defined accidental breakdown to covered mechanical, electrical, electronic, or pressure equipment. Commercial property forms often exclude mechanical breakdown, electrical disturbance, and pressure-system failure, but the boundary depends on both forms and the cause of loss.
Covered-equipment definitions may include HVAC, refrigeration, production machinery, elevators, electrical distribution, motors, generators, boilers, pressure vessels, and selected electronic systems. Consequential loss, spoilage, business income, extra expense, utility interruption, ordinance or law, and expediting expense may require separate limits, waiting periods, or endorsements.
Wear and tear, corrosion, gradual deterioration, leakage, and routine maintenance are common limitations, although a resulting covered breakdown may be treated differently. Fire and other ensuing losses can shift between the breakdown and property forms. Equipment age, installation status, underground equipment, mobile property, computer systems, service interruptions, and maintenance conditions require form-specific review.