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Surface extensions shall be made by mounting and mechanically securing an extension ring over the box. Equipment grounding shall be in accordance with Part VI of Article 250.
Exception: A surface extension shall be permitted to be made from the cover of a box where the cover is designed so it is unlikely to fall off or be removed if its securing means becomes loose. The wiring method shall be flexible for an approved length that permits removal of the cover and provides access to the box interior and shall be arranged so that any grounding continuity is independent of the connection between the box and cover.

Related Code Sections

382.2 Wiring Methods and Materials, Definitions
thermoplastic covering, or a sealed nonmetallic covering. The classification includes surface extensions intended for mounting directly on the surface ...
382.2 Wiring Methods and Materials, Definitions
classification includes surface extensions intended for mounting directly on the surface of walls or ceilings and concealed with paint, texture, joint ...
382.12 Wiring Methods and Materials, Uses Not Permitted
exceeds 150 volts for nonmetallic surface extensions and 300 volts for aerial cable Where subject to corrosive vapors Where run through a floor ...