Where is bi-level switching required?

Bi-level switching must be installed in all occupancies except hotel and motel guest rooms, store rooms, restrooms and public lobbies.

Bi-level switching can be as simple as a split-ballasting system with the lighting assigned to two circuits, each controllable from a separate wall switch that is accessible to occupants (unless remote access is required for safety or security). However, there are a number of ways to achieve bi-level switching. For example, the control can be a sensor instead of a wall switch. Another option is to install dimming ballasts. Some dimming ballasts require the installation of an additional control wire, others do not.

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