Last published in 2010, NEMA ICS 4-2015 Application Guideline for Terminal Blocks updates technical references to IEC 60947-7 series and ANSI/UL standards. It applies to 1-piece (modular) or 2-piece terminal blocks with screw-type, screwless-type, or insulation-displacement clamping units intended for industrial use and that are fixed to a support or a printed circuit board to provide electrical and mechanical connection for round, solid, or stranded conductors.