The National Electrical Manufacturers Association (NEMA) has published ANSI/NEMA CC 1-2009, “Electric Power Connection for Substations”, which was produced by NEMA’s Electrical Connector Section, and last revised in 2005.

CC 1 covers uninsulated connectors and bus supports that are made of
metal and intended for use with conductors or bus made of copper or
aluminum alloy and found in substations. Connectors that are supplied
in equipment are covered by the equipment standards instead, and are
excluded from CC1. The document includes performance and design
requirements, and test methods.

In this revision, CC 1 was reformatted with the intention of making it
more user friendly, and to emulate the formatting used by the
International Electrotechnical Commission (IEC).

To make the standard a more “global” document, NEMA says it has added
information on terminal pad dimensions and hardware used outside of
North America. Sizes of conductors used in the Americas have been shown
in square millimetres to allow users to make comparisons with other
systems.

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