How far above the floor or working platform must switches be when positioned in their highest position?

The requirement for how far above the floor or working platform switches must be installed in their highest position is established to ensure accessibility and safety in various environments. The correct standard height for the installation of switches is 7 feet. This height allows for easy reach for most individuals while also preventing accidental operation, which is essential in residential and commercial settings where fixtures might be situated in high-traffic areas.

Switch installation at this height conforms to safety codes and regulations that prioritize both the accessibility of electrical controls and the prevention of unintended engagement, which could lead to hazards. In particular, it serves to comply with the Americans with Disabilities Act (ADA), which emphasizes the importance of accessibility for all users.

The other options, while they may indicate heights that could be considered for different installations, exceed the acceptable range detailed in the applicable electrical code for switch placement. Thus, they would not meet the necessary criteria for safety and compliance.