wiredInUSA April 2019

The National Electrical Manufacturers Association (NEMA) has published its WC 76-2018 standard for controlled impedance shielded twisted pairs in internal electrical cable. It allows users to specify various numbers of shielded pairs with an impedance requirement and then tailor the materials tomeet specific endapplications. The cables are intended for electrical equipment for defense, aerospace and high-performance applications. “Original equipment manufacturers (OEMs) have, for years, needed to write their own documents to allow them to purchase controlled impedance pairs for their specific application,” said Kevin Coderre, technical director,MarmonAerospaceand Defense, and chair of the NEMA aerospace technical committee. “This document will become very popular as it allows OEMs to easily specify various combinations of shielded pairs and insulation materials to meet specific end applications.” NEMA WC 76-2018 is available, free, as an electronic download from the NEMA website.

New standard

wiredInUSA - April 2019

22