This is the harmonized ANCE, CSA Group, and UL standard for Low-Voltage Switchgear and Controlgear - Part 7-4: Ancillary Equipment - PCB Terminal Blocks for Copper Conductors. It is the First edition of NMX-J-538/7-4-ANCE, CAN/CSA-C22.2 No. 60947-7-4, and UL 60947-7-4.
This harmonized standard is based on IEC Publication 60947-7-4: Edition 1 (2013), Low-voltage switchgear and controlgear - Part 7-4: Ancillary equipment - PCB terminal blocks for copper conductors, issued August 2013. IEC 60947-7-4 is copyrighted by the IEC.
This part of IEC 60947 specifies requirements for PCB terminal blocks primarily intended for industrial or similar use.
Mounting and fixing on the printed circuit board is made by soldering, press-in or equivalent methods to provide electrical and mechanical connection between copper conductors and the printed circuit board.
This Standard applies to PCB terminal blocks intended to connect copper conductors, with or without special preparation, having a cross-section between 0,05 mm2 and 300 mm2 (AWG 30/600 kcmil), intended to be used in circuits of a rated voltage not exceeding 1 000 V a.c. up to 1 000 Hz or 1 500 V d.c.
NOTE 1 Large cross section terminal blocks are dedicated to specific design of high current PCBs. The range up to 300 mm2 is kept to cover any possible application. Examples of high current PCBs and PCB terminal blocks are shown in Annex C.
NOTE 2 AWG is the abbreviation of American Wire Gage (Gage (US) = Gauge (UK));
kcmil = 1 000 cmil;
1 cmil = 1 circular mil = surface of a circle having a diameter of 1 mil;
1 mil = 1/1 000 inch.
This Standard may be used as a guide for special types of PCB terminal blocks with components, such as disconnect units, integrated cartridge fuse-links and the like.
If applicable, in this standard the term clamping unit is used instead of terminal. This is taken into account in case of references to IEC 60947-1.
1.1DV D2 Modification by adding the following:
1.1DV.1 This Standard also applies to terminal blocks that have insulation piercing or displacement clamping units.
1.1DV.2 The wire range for terminal blocks covered by this standard include 0,051 mm2 to 300 mm2 (30 AWG to 600 kcmil) copper conductors and 3,31 mm2 to 300 mm2 (12 AWG to 600 kcmil) aluminum conductors. See Annex DVA for aluminum requirements.
In Mexico, 3,31 mm2 (12 AWG), 5,26 mm2 (10 AWG), and 8,37 mm2 (8 AWG) aluminum conductors are not allowed.
1.1DV.3 The voltage range includes up to 1500 Vac and 1500 Vdc.