ANSI C80.5-2005 pdf download American National Standard for Electrical Rigid Aluminum Conduit (ERAC)
6.5 Couplings
Couplings shall comply with the following requirements:
6.5.1 The coupling shall be made of an aluminum alloy containing not more than 0.40% copper.
6.5.2 Couplings shall be so made that all threads on the conduit will be covered when the coupling is made up “wrench tight” on conduit threads that meet the requirements of 6.4.
6.5.3 Both ends of the couplings shall be chamfered to prevent damage to the starting thread.
6.5.4 The outside diameter and length of couplings shall be as indicated in Table 3.
6.5.5 Couplings shall be straight tapped.
6.6 Elbows and nipples
Conduit elbows and nipples shall be made of the same grade of aluminum as that employed in straight lengths of electrical rigid aluminum conduit, and shall be threaded and marked for identification according to the applicable requirements for electrical rigid aluminum conduit. The dimensions of 90-degree elbows and the weights of nipples shall be as indicated in Table 4.
7 Ductility Test
Conduit shall be capable of being bent, at ambient temperature, 90 degrees around a mandrel, the radius of which is shown in Table 4, without developing cracks.
8 Examination of Product
8.1 Place of inspection
All tests and inspections shall be made at the place of manufacture prior to shipment, unless otherwise specified, and shall be so conducted as not to interfere with normal manufacturing processes.
8.2 Visual inspection
Each length of conduit shall be examined visually both on the exterior and interior surfaces to determine if the product is free from slivers, burrs, or other similar injurious defects.
8.3 Retests
If any samples of ERAC tested as prescribed in this specification fails, two additional samples shall be tested, both of which shall comply with the requirements of this specification.
9 Marking
9.1 Product marking Each length of conduit, nipple, and elbow shall be identified to describe the product and include the manufacturer’s name or trademark or other descriptive marking by which the organization responsible for the product can be identified.