PrefaceThis is the harmonized ANCE, CSA Group, and UL standard for Low-Voltage Switchgear and Controlgear - Part 7-3: Ancillary Equipment - Safety Requirements for Fuse Terminal Blocks. It is the first edition of NMX-J-538/7-3-ANCE, the first edition of CAN/CSA-C22.2 No. 60947-7-3, and the third edition of UL 60947-7-3. This edition of UL 60947-7-3 supersedes the previous edition (s) published on May 6, 2011.
This harmonized standard is based on IEC Publication 60947-7-3: Edition 1 (2002), Low-Voltage Switchgear and Controlgear - Part 7-3: Ancillary Equipment - Safety Requirements for Fuse Terminal Blocks, as revised by corrigendum (March 2003). IEC 60947-7-3 is copyrighted by the IEC.
ScopeThis part of IEC 60947 applies to fuse terminal blocks with screw-type or screwless-type clamping units for the connection of rigid (solid or stranded) or flexible copper conductors for the reception of cartridge fuse-links in accordance with IEC 60127-2, intended primarily for industrial or similar use in circuits not exceeding 1 000 V a.c., up to 1 000 Hz or 1 500 V d.c., and having a maximum short-circuit breaking capacity of 1 500 A.
They are intended for installation in electrical equipment with enclosures which surround the fuse terminal blocks to such an extent that they are accessible only with the aid of a tool.
For certain applications, for example in control circuits, the fuse terminal blocks may be designed exclusively for short-circuit protection.
NOTE This Standard may be used as a guide for fuse terminal blocks for the reception of special cartridge fuselinks which do not meet the requirements of IEC 60127-2.
The object of this standard is to specify safety requirements and test methods for the mechanical, electrical and thermal characteristics of fuse terminal's blocks, to ensure the compatibility between terminal blocks and standardized fuse-links.
This Standard may be used as a guide for
- fuse terminal blocks requiring the fixing of special devices to the conductors, for example quick connect terminations or wrapped connections, etc.;
- fuse terminal blocks providing direct contact to the conductors by means of edges or points penetrating the insulation, for example insulation displacement connections, etc.
Where applicable in this standard, the term clamping unit has been used instead of the term terminal. This is taken into account in case of reference to IEC 60947-1.
1.1DV D2 Modification by adding the following:
This Standard specifies requirements for fuse terminal blocks with screw-type or screwless-type clamping units for the connection of rigid (solid or stranded) or flexible copper conductors for the reception of cartridge fuse-links, in accordance with Annex DVB, National Electrical Code, NFPA 70 (for use in the USA), CSA C22.1-15 Canadian Electrical Code, Part I (for use in Canada), and NOM-001-SEDE, Electrical Installations (Utility) [for use in Mexico].
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