Three standards govern the design and performance of PVC-coated rigid steel conduit: American National Standards Institute (ANSI) C80.1 Underwriters Laboratories UL6 National Electrical Manufacturers Association (NEMA) RN-1 All three of these standards conform to the appropriate American Society for Testing and Materials (ASTM) standards and test methods.
The first step requires an evaluation of the zinc-galvanized coating beneath the PVC coating and on threaded surfaces. The second step is to evaluate the adhesion of the PVC coating to the zinc.
In cases where the PVC protection is accidentally breached, due to cuts, scrapes, or other damage, it is important to have a second line of defense – a zinc or “galvanized” coating. This zinc coating will significantly slow the corrosion and allow more time for repairs.
Conduit systems without adequate zinc protection underneath the PVC coating are more likely to suffer catastrophic corrosion damage. This is why NEMA RN-1, section 3.1.1 requires the proper and correct treatment of galvanized conduit before it is PVC coated. The standard says, “The surface shall be cleaned in such a manner that the galvanized surface of the conduit is not harmed or eroded.”
The Preece test, which follows procedures set forth by ASTM A239, is the test recognized by UL 6, NEMA RN-1 and ANSI C80.1 to assess the adequacy of zinc protection for rigid steel conduit.
The test is done to evaluate the zinc coating on the galvanized rigid conduit to ensure adequate protection from corrosion per UL 6.2.2 by subjecting the coated product to four 60-second immersions in a copper sulfate solution. The test also determines if the surface of the conduit has been damaged as a result of the preparation for PVC coating.
No, if the zinc coating is not adequate, the conduit will not comply with NEMA RN-1.
Yes. Calbond FULLY complies with NEMA RN-1, in all respects.
Yes. Calbond Form 8 & Form 7 fittings comply with the NEMA 4X standard. In addition, Calbond GUA boxes comply with the NEMA 4X explosion-proof standards.
Calbond PVC Coated Conduit Systems feature a 2mil light gray urethane interior coating.
Calbond is manufactured in the industry’s newest, and state of the art, PVC coating factory located in Santa Paula, California.
Yes, we will. For convenience to our customers and their projects, we will ship our products wherever needed as soon as possible.
Calbond sells only to authorized electrical distributors. We will gladly assist you in locating a distributor in your area.
Calbond has a national network of sales representatives serving customers across the USA. Feel free contact the sales representative closest to your location anytime.
Calbond’s PVC Coated conduit threads are manufactured with standard NPT conduit threads and fully comply with UL6 specifications.
Yes. One PVC coated coupling with flexible overlapping sleeves is included with each length.
Smooth couplings eliminate areas where harmful, corrosive elements can gather and have detrimental effects on the coated conduit system. It is also not recommended to use a wrench or other tool on the coupling as this could result in damaging the PVC coating.
Yes. The degree of bends available: 11-1/4°, 15°, 22-1/2°, 30°, 45°, 90° Large radius PVC coated elbows are also available upon request in 24″, 36″, 48″ and 60″?
Calbond PVC Coated GRC is produced using Galvanized Rigid Conduit GRC that meets UL6 standards. It is hot-dipped galvanized inside and outside, ensuring metal-to-metal contact and galvanic protection against corrosion.
UL6A, Calpipe Industries, Inc. UL® File Number is E230584.
- Aluminum Yield is approximately 13,000 PSI
- Steel GRC Yield is approximately 32,000 PSI
The difference in Form 7 to Form 8 conduit bodies is in the way the lid connects to the fitting. Form 7 uses clips on the lid that go under the lip on the fitting. Form 8 has screws that attached directly to the fitting body.