What should be the minimum clearance from the floor to any energized part of a switchboard?

The minimum clearance from the floor to any energized part of a switchboard is set at 12 inches, which is indicated by the correct answer. This clearance requirement is crucial for safety reasons. It helps prevent inadvertent contact with live electrical parts, reducing the risk of electrical shock to personnel who may be accessing or working around the switchboard.

Additionally, having a designated clearance ensures that any potential maintenance or adjustments can be performed safely without the risk of hazardous interactions with energized components. This standard is part of broader safety codes and regulations that aim to protect workers and ensure safe working environments in facilities that house electrical equipment. It's important that electricians be aware of these specific safety distances to comply with the National Electrical Code (NEC) and local regulations.