Can wiremold be used at an exterior location?
Saturday, July 28, 2018
Wiremold is a popular brand of “surface metal raceway” manufactured by Legrand. The company states on the packaging that it is only rated for interior and dry locations. Also, the NEC (National Electrical Code) rates surface metal raceways for dry locations only.
So, while it is easy to install and less visually intrusive when seen running along a wall than conduit, it should not be used outdoors. The installation shown above, on the exterior wall of a home in the screen porch, is actually wrong for three reasons: wiremold on the exterior, an interior-rated receptacle at the exterior, and no required GFCI-protection for the receptacle.
We have heard it argued that wiremold is acceptable if used for “protection from physical damage” for exterior-rated cable—instead of calling it a raceway—but that still conflicts with the manufacturer’s rating for the material.
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