Per 404.9(B), which types of switches are generally required to be grounded?

• A. Dimmer switches
• B. Fan controls and other similar switch controls
• C. Snap switches
• D. All of the above

Answer: (D)

Grounding provides a safe path for fault current to reach the earth, so energized metal parts don’t pose a shock risk. In 404.9(B), switches used in typical residential wiring are expected to be grounded. Dimmer switches, fan controls and other similar switch controls, and snap switches all fit into that category, because they can have metal components that could become energized and need a ground connection. The grounding can be achieved via a dedicated equipment grounding conductor connected to the switch’s ground terminal, or by bonding the device through a grounded metal box or strap. Since these common switch types all require grounding, all of them are generally required to be grounded.