Hello dear colleagues,

IEC 60947-7-2 is a critical part of the IEC 60947 standard series, which deals with low-voltage switchgear and controlgear. This specific section of the standard focuses on terminal blocks suitable for use in electrical distribution systems and similar applications. The standard outlines requirements for design, testing, performance, and safety of terminal blocks used with screw-type and screwless-type clamping units. 

Scope and Purpose

    Objective: IEC 60947-7-2 specifies the requirements and tests for terminal blocks that are used primarily in electrical distribution systems to ensure reliable electrical connections and facilitate maintenance and diagnostics.
    Application: The standard applies to terminal blocks intended to be used with both screw-type and screwless clamping units, particularly highlighting the needs for robustness, ease of use, and safety in diverse environmental conditions.

 Normative References

    This section includes references to other IEC standards and relevant technical documents that are essential for understanding and applying the requirements of IEC 60947-7-2. These references ensure compatibility with other components and safety standards.

 Terms and Definitions

    Key Terms: This part of the standard provides clear definitions for all the technical terms and concepts used within the document, such as "terminal block", "clamping unit", "electrical distribution system", etc. This ensures that the standard is uniformly understood and applied globally.

 Construction Requirements

    Materials: Specifies the types of materials that should be used for various parts of the terminal blocks, focusing on durability and electrical insulation.
    Design: Details the design requirements that enhance safety, such as protective covers and barriers, to minimize the risk of accidental contact and electrical shock.

 Electrical Requirements

    Voltage and Current Ratings: Defines the maximum voltage and current that the terminal blocks can safely handle.
    Dielectric Properties: Specifies the insulation resistance and dielectric strength that the terminal blocks must meet to prevent electrical failures.
    Connection Integrity: Describes the requirements for the mechanical stability of the connections, ensuring they remain secure under normal and abnormal conditions.

 Mechanical Requirements

    Mechanical Operation: Specifies the number of operation cycles the terminal blocks should withstand without degradation of performance.
    Clamping Mechanism: Details the design and functionality of screw-type and screwless clamping units, ensuring they provide a reliable and secure mechanical and electrical connection.

 Testing and Verification

    Test Conditions: Outlines the environmental and operational conditions under which the terminal blocks should be tested to validate their compliance with the standards.
    Performance Tests: Includes a series of tests to evaluate the mechanical and electrical integrity of the terminal blocks over their expected service life.
    Safety Tests: Assesses the terminal blocks’ ability to protect against electric shock, fire hazards, and mechanical failures.

 Marking and Documentation

    Marking Requirements: Specifies the information that must be marked on the terminal blocks, such as manufacturer’s information, voltage and current ratings, and type.
    Documentation: Requires that the terminal blocks come with comprehensive documentation, including installation, operation, and maintenance instructions, to ensure safe and correct usage.

 Compliance and Certification

    Details the processes for verifying that the terminal blocks meet the standard’s requirements, including the types of certifications that may be necessary for different markets and applications.

 Annexes

    Additional Information: Provides supplementary information and guidance that can help manufacturers and users understand and implement the requirements more effectively.

IEC 60947-7-2 plays a crucial role in ensuring the safety and functionality of terminal blocks in electrical distribution systems. By setting stringent requirements for materials, design, electrical and mechanical properties, and testing, the standard helps to ensure that these components can reliably manage electrical connections in various conditions while providing safety to users and maintenance personnel.

IEC 60947 is a series of standards set by the International Electrotechnical Commission (IEC) for low-voltage switchgear and controlgear. This standard specifies the design, construction, performance, and testing criteria for electrical control devices used in industrial applications. It covers the general characteristics of these devices which are critical for safety and reliability, and is widely accepted internationally.

 IEC 60947-1: General Rules

 IEC 60947-2: Circuit Breakers

 IEC 60947-3: Switches, Disconnectors, Switch-disconnectors, and Fuse-combination units

* These questions generally include the ones that may come to mind for many people regarding the "IEC Industry Standards" topic. Each user or student will have their specific questions depending on a particular situation or application. The answers are not binding and do not express absolute certainty. "There is no objection to sharing our article above, citing it as a source". Automation Mall Community 03.2022

++ Control Devices main menu 

++ Homepage