What must be indicated on the equipment when circuit breakers or fuses are applied with series combination ratings?

When circuit breakers or fuses are utilized with series combination ratings, it is essential for the equipment to be legibly marked in the field. This marking serves to provide clear identification of the ratings and limitations of the combination used. It ensures that anyone working with, or around, the equipment understands how the protection devices are configured and which ratings apply.

The marking is crucial for preventative safety measures, helping to ensure that the devices will be applied correctly and that individuals can quickly assess the operational characteristics and safety mechanisms in place. Without proper and legible markings, there can be confusion or misapplication of the circuit protection devices, which may lead to equipment damage or safety hazards.

In contrast, energy consumption data, hazard warnings, and service history are important information pieces for general electrical safety and maintenance practices but are not specifically required regarding the marking for series combination ratings. The focus here is primarily on clear communication of the device configurations to ensure proper understanding and safe operation.