The National Electrical Manufacturers Association (NEMA) has published ANSI/NEMA CC 1-2009 Electric Power Connection for Substations. The standard was produced by NEMA's Electrical Connector Section, and was 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 this standard. The document includes performance requirements, test methods, and design requirements.

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

According to Ron Lai and Jim Zahnen of the Electrical Connector Section, "To make ANSI/NEMA CC 1 a more global document, we have added information on terminal pad dimensions and hardware that are used outside of North America. Sizes of conductors used in the Americas have been shown in square millimeters to allow the user of the standard to make comparisons with other systems."