What are the dimensional measurements of the entire main switchboard (MSB1 and MSB2) plus future sections?

The correct choice regarding the dimensional measurements of the entire main switchboard (MSB1 and MSB2) plus future sections is grounded in specific standards and practical applications related to electrical infrastructure. The dimensions given as 37 feet in length, 90 inches in height, and 24 inches in depth are typical measurements for a main switchboard, allowing for both current needs and future expansions.

In large electrical systems, the main switchboard needs to accommodate a variety of equipment, including transformers, circuit breakers, and busbars, which is why appropriate dimensions such as those mentioned are necessary. The length provides adequate space for multiple sections and accessories, while the height and depth ensure that there is enough room for installation and service activities, along with providing safety clearances.

This choice reflects a common configuration in electrical installations, ensuring compliance with regulations and enhancing maintenance capabilities over the lifespan of the electrical system. Metrics provided in other options might not support the necessary operational or safety requirements for such a setup, either being too small to fit the equipment or too expansive without practical justification.