ARTICLE 362. ELECTRICAL NONMETALLIC TUBING: TYPE ENTARTICLE 362. ELECTRICAL NONMETALLIC TUBING: TYPE ENT362.2. Definition. One type of plastic raceway defined in the Code (Fig. 362-1) is ENT (electrical nonmetallic tubing), which is "a pliable corrugated raceway of circular cross section with integral or associated couplings, connectors, and fittings listed for the installation of electrical conductors. It is composed of a material that is resistant to moisture [and] chemical atmospheres and is flame retardant." ENT can be bent by hand, when being installed, to establish direction and lengths of runs.