NEMA released a standard defining minimum electrical performance and characteristics, material and mechanical specifications (such as allowable conductor sizes, stranding, and shielding) of premise wiring cable for voice and data applications. WC 63.1-2000, Performance Standard for Twisted Pair Premise Voice and Data Communications Cable, may be purchased for $60 by contacting Global Engineering Documents at (800) 854-7179 (US), (303) 397-7956 (international), (303) 397-2740 (fax), or via the Internet at Also included in the standard are definitions, test methods, and appendices developed for U.S. government reference.