The National Electrical Manufacturers Association (NEMA) has published NEMA ICS 4-2015 Application Guideline for Terminal Blocks.

A new guide has not been published since 2010. This edition serves as an update on the technical references to IEC 60947-7 series and ANSI/UL standards.

The new guide applies to one-piece or two-piece terminal blocks with screw-type, screwless-type or insulation-displacement clamping units that are meant for industrial use. It also applies to blocks that are fixed to a support or a printed circuit board to provide electrical and mechanical connection for round, solid, or stranded conductors.

NEMA represents nearly 400 electrical, medical imaging and radiation therapy manufacturers.

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