Section 404.2(C) requires a grounded conductor be installed at the switch location unless there is a way to install a grounded conductor in the future if one is needed. This means that a three-wire cable with a white grounded conductor instead of a two-wire cable with a reidentified white wire would need to be installed between the lighting outlet and the switch box location. List the situations when this is not required.
What will be an ideal response?
1. The conductors enter the switch box through a raceway and a new grounded conductor could be installed in the raceway at a later date.
2. The switch box is accessible for the installation of another cable with a grounded conductor without removing any wall or ceiling finish materials like sheetrock.
3. The switch does not serve a habitable room, bathroom, hallway, or stairway. Examples where this rule does not apply are garages or unfinished basements.
4. Multiple switch locations with three-way and four-way switches are used to control the same lighting load and the entire floor area of the room is visible from all of the switch locations. If this is the case only a grounded wire is required at only one switching location.
5. The lighting load is controlled by automatic means like an energy management system.
6. The switch controls a receptacle load.
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