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NEMA Publishes RV 3-2010 Application and Installation Guidelines for Flexible and Liquidtight Flexible Metal and Nonmetallic Conduits


10/4/2010 1:06 PM

(ROSSLYN, Va.)—The National Electrical Manufacturers Association (NEMA) has published RV 3-2010 Application and Installation Guidelines for Flexible and Liquidtight Flexible Metal and Nonmetallic Conduits. The standard was last published in 2006.

Before this newest revision, RV 3 only contained guidelines for Liquidtight Flexible Metal Conduit (LFMC). Through a cooperative effort of NEMA’s Flexible Metal Conduit Voting Classification (7WC-1) and Polymer Raceway Products Section (5TC) Technical Committee, Liquidtight Flexible Nonmetallic Conduit (LFNC) guidelines were added.

The new guidelines for LFNC cover general construction aspects, such as available trade sizes and conduit materials and surfaces, as well as grounding, marking, and codes and standards. Guidelines on LFNC fittings are also addressed in detail, covering fitting selection, environmental considerations, marking, grounding and installation considerations including conduit preparation, assembly torque, assembly technique, and attachment to boxes or enclosures and support systems.

According to Fred Small, Hubbell Incorporated, who chairs the 5TC Section, “Users of the new RV 3 will certainly benefit from having a convenient and concise reference guide to all articles of the National Electrical Code® relevant to LFNC wiring systems. Even more importantly, though, these guidelines cover critical installation aspects of LFNC that help ensure that the mechanical and electrical integrity of the wiring system is maintained. The industry is looking forward to seeing this information being made available to the installers and Authorities Having Jurisdiction.”

RV 3 may be downloaded at no charge, or a hardcopy purchased for $85, by visiting www.nema.org/stds/rv3.cfm, or by contacting IHS at 800-854-7179 (within the U.S.), 303-397-7956 (international), 303-397-2740 (fax), or global.ihs.com.

NEMA is the association of electrical and medical imaging equipment manufacturers. Founded in 1926 and headquartered near Washington, D.C., its approximately 450 member companies manufacture products used in the generation, transmission and distribution, control, and end use of electricity. These products are used in utility, industrial, commercial, institutional, and residential applications. The association’s Medical Imaging & Technology Alliance (MITA) Division represents manufacturers of cutting-edge medical diagnostic imaging equipment including MRI, CT, x-ray, and ultrasound products. Worldwide sales of NEMA-scope products exceed $120 billion. In addition to its headquarters in Rosslyn, Virginia, NEMA also has offices in Beijing and Mexico City.

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