Surface Metal Raceways

Surface metal raceway is the finished-looking metal channel — Wiremold is the famous brand — that mounts right on top of an existing wall to run new circuits and mount receptacles or data outlets. It's the classic tool for adding power in an office, classroom or shop without demolition.

Because it sits exposed, it's limited to dry locations and non-hazardous, non-severe-damage areas. The Code caps the number of conductors by the raceway's listed capacity, and the metal assembly, properly connected, serves as an equipment-grounding path.

When it applies

Surface metal raceway, the Wiremold type, lets you add circuits and outlets on a finished wall without tearing into it. It is the practical answer in offices, labs, and retrofits where fishing wire through the wall is not worth it and you need a clean, protected channel on the surface.

Common mistakes

• Overfilling the raceway beyond its listed conductor fill.
• Using it in wet or hazardous locations where it is not permitted.
• Running it through walls or floors, which the surface method is not intended to do.

In the field

In an occupied office I run surface raceway to drop new outlets right where the desks are, no drywall repair, no downtime. Just watch the fill and keep it in the dry, indoor locations it is listed for.