Which of the following would be considered a single accident in equipment breakdown coverage?

In equipment breakdown coverage, a single accident typically refers to incidents that are closely linked in time and cause. The correct answer is the scenario where all accidents at a single location occur at the same time due to the same cause. This situation is viewed as one event because the incidents are interconnected, allowing for a clearer assessment of the damages and insurance liability.

By contrast, the first option discusses a 24-hour period, which could encompass numerous unrelated incidents, thus not fitting the definition of a single accident. The second choice involves accidents at various insured locations simultaneously, introducing the complexity of multiple incidents across different places, which would not constitute a single event. Lastly, the mention of all accidents caused by the same type of equipment does not necessarily imply that they occur at the same time or location, which is crucial for classifying them as a single accident. Therefore, option C is the only choice that adheres to the criteria necessary for defining a single accident in the context of equipment breakdown coverage.