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Illustrated Changes to the NEC, 2005 Edition - Part 2

Article 411

Lighting Systems Operating at 30 Volts or Less

411.4 Locations Not Permitted

Low-voltage lighting systems installed concealed or through a building wall are no longer required to be installed in a Chapter 3 wiring method. Class 2 cables (CL2) are now permitted to be used for this application.

Conductors for lighting systems operating at 30V or less must not be:
(A) Installed in a concealed space or to pass through a building wall, except as permitted in (1) or (2).
(1) Lighting system conductors installed within a Chapter 3 wiring method.
(2) Lighting system conductors supplied by a listed Class 2 power source and installed in accordance with 725.52.

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