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. Products covered by this Standard are intended for use: a) at a maximum continuous operating temperature of 75??(167??; b) at a maximum ambient temperature of 50??(122??; 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??(140??; and d) underground (direct burial)@ in Canada only This Standard does not apply to fittings that are intended to be joined by solvent cement. Solvent-attached fittings are covered by UL 651 or CSA C22.2 No. 211.2. Solvent-attached fittings integral with an outlet or flush device box are covered by UL 514C or CAN/CSA-C22.2 No. 85. For products intended for use in Canada@ general requirements are given in CSA-C22.2 No. 0.