Article 390 Underfloor Raceways

390.1	Scope
390.2	Use

(A) Permitted. This type of raceway can be used beneath the surface of concrete flooring or in an office flush with the concrete floor with other floor covering.

(B) Not Permitted. This type of raceway can not be used if exposed to corrosive vapors, in a hazardous location [for an exception refer to 501.4(B)(3) and 504.20], in concrete or in corrosive areas unless properly protected and approved.

390.3	Covering
390.4	Size of Conductors

Not larger than designed for.

390.5

Maximum Number of Conductors in Raceway

Not more than 40% fill.

390.6	Splices and Taps
390.7	Discontinued Outlets
390.8	Laid in Straight Lines
390.9	Marker at Ends
390.10	Dead Ends
390.13	Junction Boxes
390.14	Inserts
390.15	Connections to Cabinets and Walls
390.17	Ampacity of Conductors