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Article 310 Low Res - Modem [1695Kb] Hi Res - Cable/DSL [5622Kb]        Page 2 of 3
Wiring Methods

310.8 Locations

The text was revised to read:

(D) Locations Exposed to Direct Sunlight. Insulated conductors and cables used where exposed to direct rays of the sun must be listed for sunlight resistance or listed and marked “sunlight resistant.”.

Intent: The text was revised to clarify the requirements for listing and/or marking conductors and cables that are exposed to direct rays of the sun. According to the UL White Book, conductors within SE cables must be suitable for direct rays of the sun. Due to UL requirements, these conductors cannot be marked “sunlight resistant.” However, single insulated conductors such as THHN must be listed for sunlight resistance and the marking “sunlight resistant” is optional. Figure 310-1

Author’s Comment: Typically, THHN 2 AWG and larger (in the color black) is listed for sunlight resistance and the conductor will be marked “sunlight resistant.”

Figure 310-1
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