UL 6-2010 pdf download
UL 6-2010 pdf download.Electrical Rigid Metal Conduit- Steel.
5.3.2 ZInc coating
5.3.2.1 A protective coating of zinc shall cover completely, shall adhere firmly at all points, shall be smooth and free from blisters and other defects that can lessen the protective value of the coating, shall be In metal-to-metal contact with the steel, and shall comply with Clause 6.2.2. See Clause 5.4.2 regarding threads
5.3.3 Alternate Corrosion-resistant coating
5.3.3.1 An alternate corrosion- resistant coating shall cover completely, shall adhere firmly at all points, and shall be smooth and free from blisters and other defects that can lessen the protective value of the coating. See Clause 5.4.2 regarding threads.
5.3.3.2 An alternate corrosion-resistant coating shall comply with the requirements of Clause 6.2.4. When the conduit, elbows, and nipples are intended to be used with either set-screw or compression type couplings, they shall comply with the requirements of Clause 6.2.4 and be subjected to the assembly, bending. resistance, pull, and fault current tests, without removal of the alternate corrosion-resistant coating, in accordance with the relevant standard for fittings for cable and conduit as indicated In Reference Item No. 3, Annex A. Conduit, elbows, and nipples provided with an alternate corrosion-resistant coating and marked in accordance with Clause 7.6 are not suitable for use with these couplings and therefore do not require evaluation.
5.33.3 Conduit provided with a nonmetallic alternate corrosion-resistant coating that is not marked with a temperature designation, or is marked “90°C (“200°F) Is for use in ambient temperatures not to exceed 90°C (200°F) It is not prohibited that conduit provided with a nonmetallic alternate corrosion-resistant coating that is for use at temperatures in excess of 90°C (200°F) be marked with a rating which has been evaluated in accordance with Clause 6.2.4,4.1.
5.334 Conduit provided with a nonmetallic alternate corrosion-resistant coating that is not marked with a temperature designation, or Is marked “0°C (32°F”), is for use in ambient temperatures not below 0°C (32°F). It is not prohibited that conduit provided with a nonmetallic alternate corrosion-resistant coating
that is for use at temperatures below 0°C (32°F) be marked with a rating which has been evaluated in accordance with CLause 6.1.2 and 6.2.4.10,
5.3.4 Organic coating
5.3.4.1 An organic coating shall cover evenly the surface to which it is applied, shall be of uniform quality throughout, shall have a smooth and even appearance, and shall comply with Clause 6.2.3 and the bending requirements of Clause 6.2.1.1.
5.3.5 Supplementary coating
5,3.5.1 The supplementary coating or coatings are not required to meet the requirements for primary corrosion-resistant Coatings. The use of one or more coatings is not prohibited. Conduit, elbows, or nipples that are provided with supplementary coatings that have not been evaluated for their corrosion resistance characteristics shall be mariced in accordance with Clause 7.10.
5.3.5.2 Supplementary nonmetallic coatings shall be evaluated with respect to:
a) flame propagation,
b) detrimental effects on the corrosion resistance provided by the primary protective coatings, C) the fit of the couplings, and
d) electrical continuity with couplings.
See Reference Item No. 4, Annex A. The supplementary coating shall be provided in addition to the full primary corrosion-resistant coating.
5.3.6 Surface treatment
5.3.6.1 When one or more surface treatments not exceeding 0.0038 mm (0.00015 in) are employed as a top coat or conversion coating, the coatings shall not be required to meet the requirements for an alternate corrosion-resistant coating or organic coating
5.4 Threading and chamfering
5.4.1 General
5.4.1.1 Each elbow, nipple, and straight length of conduit shall be threaded the same on both ends. Each end shall be chamfered on the interior surface to remove burrs and sharp edges formed by the cut-off tool. All the effective length of threads (L2) shall be full and clean cut. See Figure 1 and Reference Item No. 5, Annex A.
