What is the maximum allowed height for the mainline disconnect in a machine room?

The maximum allowed height for the mainline disconnect in a machine room is typically set at 5 feet 6 inches. This height is established to ensure easy access and safety for operators and maintenance personnel. The disconnect must be within reach to allow for quick operation during emergencies or regular maintenance without the need for additional tools or ladders.

Safety regulations dictate this height to help prevent accidents that could occur if personnel were required to reach too high, particularly in an environment where machinery and electrical systems are present. By ensuring the disconnect is located no higher than 5 feet 6 inches, it allows for a more efficient and safer working environment.

Other height options present in the question either exceed the maximum allowed standard or are not compliant with safety guidelines, which aim to minimize risks in machine rooms. The choice of 5 feet 6 inches balances accessibility with safety, making it the correct standard in this context.