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The following luminaires located within the same area shall be tandem wired:
  1. Fluorescent luminaires equipped with one, three or odd-numbered lamp configurations, that are recess-mounted within 10 feet (3048 mm) center-to-center of each other.
  2. Fluorescent luminaires equipped with one, three or any odd-numbered lamp configuration, that are pendant- or surface-mounted within 1 foot (305 mm) edge-to-edge of each other.
Exceptions:
  1. Where electronic high-frequency ballasts are used.
  2. Luminaires on emergency circuits.
  3. Luminaires with no available pair in the same area.

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