Scope 1.1 This Standard applies to corrugated electrical nonmetallic tubing (ENT) and mechanically-attached fittings, for use in accordance with C22.1, Canadian Electrical Code, Part I (CE Code), NFPA 70, National Electrical Code (NEC) and NOM-001-SEDE, Standard for Electrical Installations (Mexico). These requirements also apply to mechanically-attached fittings integral with an outlet box. 1.2 Products covered by this Standard are intended for use: a) at a maximum continuous operating temperature of 75°C (167°F); b) at a maximum ambient temperature of 50°C (122°F); c) in attics provided that the ENT is installed no higher than 900 mm (3 ft) above the bottom of the ceiling joist, and the ENT material is rated minimum 60°C (140°F); and d) underground (direct burial), in Canada only.