All of the following are excluded in the equipment breakdown basic policy EXCEPT

The correct answer is the explosion of steam boilers. This is included in the coverage provided by an equipment breakdown basic policy, as it falls under the risks typically covered by such insurance. Equipment breakdown policies are designed to protect against sudden and accidental failures of equipment, which can lead to significant operational interruptions and financial loss.

In contrast, wear and tear, intentionally caused damage, and equipment failure due to non-accidental factors like neglect or poor maintenance are generally excluded from coverage. Wear and tear refers to the gradual deterioration of equipment, which is expected over time and not covered. Intentionally caused damage is excluded because insurance is meant to cover unforeseen accidents, not deliberate acts. Equipment failure resulting from lack of proper maintenance is also not covered, as it is considered a preventable issue rather than a sudden malfunction.

The inclusion of steam boiler explosions underscores the policy's focus on covering unexpected, catastrophic events rather than routine issues or preventable damage.