Which coverage is NOT required to add Utility Interruption to an Equipment Breakdown policy?

The option indicating "Extra expense only" as the coverage not required to add Utility Interruption to an Equipment Breakdown policy is correct. Utility Interruption coverage is intended to provide financial protection against losses sustained due to a disruption in utility services, which can impact the operation of equipment.

To add Utility Interruption coverage effectively, certain types of coverage are typically needed to ensure comprehensive protection. Business income coverage is essential as it addresses lost income resulting from the interruption of operations. Spoilage damage coverage is also relevant because it protects perishable goods that can be lost due to a utility failure, such as refrigerated products. Property damage coverage may be necessary to cover any resultant damage to physical property caused by the breakdown of equipment related to the loss of utility service.

On the other hand, while extra expense coverage is helpful in managing the additional daily costs incurred when a company needs to maintain operations despite a disruption, it is not a prerequisite for Utility Interruption coverage. This distinction makes extra expense coverage the correct choice for the question asked, as it is not explicitly required to add Utility Interruption to an Equipment Breakdown policy.