NEMA ICS 4:2015

This Applications Guideline applies to one-piece, or modular, or two piece terminal blocks with screwtype, screwless-type, or insulation-displacement clamping units intended for industrial use and fixed to a support or to a printed circuit board (PCB) to provide electrical and mechanical connection for the following round, solid, or stranded conductors: a) Copper conductors only, without special preparation, having a cross-section of 24 AWG to 2000 kcmil (0.2-1014 mm2). b) Aluminum (uncoated) conductors only, without special preparation, having a cross-section of 12 AWG to 6 AWG (2.5-16 mm2) for solid conductors and 12 AWG to 2000 kcmil (3.3-1014 mm2) for stranded conductors. c) Aluminum (uncoated) and copper conductors, without special preparation, having a crosssection of 12 AWG to 6 AWG (2.5-16 mm2) for solid conductors and 12 AWG to 2000 kcmil (3.3-1014 mm2) for stranded conductors. The terminal blocks are intended for use in circuits of rated insulation voltage not exceeding 1000 V AC at a frequency not greater than 60 Hz or not exceeding 1500 V DC. This Applications Guideline does not apply to connectors specifically designed for, and forming, an integral part of equipment, which are dealt with in the relevant equipment standards. NOTE -This Applications Guideline may be used as a guide for the termination requirements for disconnect-type or other special terminal blocks for which there is no standard at this time.