UL 6:2010 pdf download.Electrical Rigid Metal Conduit- Steel.
5.4.2 Protection 01 threads
5.4.2.1 Threads that are cut after the protective coatings are applied shall be treated to keep corrosion from taking place before the conduit is installed. Threading oils shall not be used br protection of threads. Protective coatings shall not interfere with electrical continuity through couplings and other fillings when the conduit is instaMed,
5.4.2.2 Threads that are cut before the application of the final coating that protects the exterior surface of the tube from corrosion, which are therefore treated with the same coating when the tube is given its final coat, are deemed to be protected.
5.4.3 Pitch of threads
5.4.3.1 The pitch, the number of threads per 25.4 mm (1 in), and the length of the threaded portion at each end of an elbow, nipple, or straight length of conduit shall be as indicated In Figure 1 and Table 5.3.
5.4.4 Taper of threads
5.4.4.1 The taper of threads shall be I in 16 (3/4 Inch per foot), and the perfect thread (See L2 In Figure 1) shall be tapered for its entire length.
5.4.4.2 The angle between the sides of the thread shall be 60 degrees when measured in an axial plane The line bisecting this angle shall be perpendicular to the axis.
5.4.2.1 Threads that are cut after the protective coatings are applied shall be treated to keep corrosion from taking place before the conduit is installed. Threading oils shall not be used br protection of threads. Protective coatings shall not interfere with electrical continuity through couplings and other fillings when the conduit is instaMed,
5.4.2.2 Threads that are cut before the application of the final coating that protects the exterior surface of the tube from corrosion, which are therefore treated with the same coating when the tube is given its final coat, are deemed to be protected.
5.4.3 Pitch of threads
5.4.3.1 The pitch, the number of threads per 25.4 mm (1 in), and the length of the threaded portion at each end of an elbow, nipple, or straight length of conduit shall be as indicated In Figure 1 and Table 5.3.
5.4.4 Taper of threads
5.4.4.1 The taper of threads shall be I in 16 (3/4 Inch per foot), and the perfect thread (See L2 In Figure 1) shall be tapered for its entire length.
5.4.4.2 The angle between the sides of the thread shall be 60 degrees when measured in an axial plane The line bisecting this angle shall be perpendicular to the axis.
