When installing a 277-volt 15-amp switch and a 120-volt 15-amp switch in the same box, what is required?

When installing a 277-volt 15-amp switch and a 120-volt 15-amp switch in the same box, the requirement for a proper separation plate is crucial for safety and compliance with electrical codes. The separation plate serves to provide a physical barrier between the two voltage systems, preventing any potential electrical faults or shorts that could arise from the close proximity of differing voltages within the same enclosure. This separation is essential to ensure that the higher voltage does not inadvertently contact the lower voltage components, which could pose a serious risk of shock or fire.

Using a separation plate is particularly important in industrial environments where equipment operates at different voltages, and maintaining clear distinctions between them can protect both users and equipment. The other considerations, while important in different contexts, do not address the specific requirement of isolating the two voltage systems effectively within the same junction box.