(D) Direct-Current Circuits on or in Buildings
Exception: PV hazard control systems installed in accordance with 690.12(B)(2)(1) shall be permitted to be provided with or listed for use with nonmetallic enclosure(s), nonmetallic raceway(s), and cables other than Type MC metal-clad cable(s), at the point of penetration of the surface of the building to the PV hazard control actuator.
Wiring methods on or in buildings shall comply with the additional installation requirements in 690.31(D)(1) and (D)(2).
- Exposed raceways, cable trays, and other wiring methods
- Covers or enclosures of pull boxes and junction boxes
- Conduit bodies in which any of the available conduit openings are unused
The labels or markings shall be visible after installation. All letters shall be capitalized and shall be a minimum height of 9.5 mm (3/8 in.) in white on a red background. Labels shall appear on every section of the wiring system that is separated by enclosures, walls, partitions, ceilings, or floors. Spacing between labels or markings, or between a label and a marking, shall not be more than 3 m (10 ft). Labels required by this section shall be suitable for the environment where they are installed.