Overview
IEC 60702-2:2002 is an international standard published by the International Electrotechnical Commission (IEC) that specifies the requirements for terminations used with mineral insulated (MI) cables rated up to 750 V. This standard is part two of the series, complementing IEC 60702-1, which covers the cables themselves. MI cables are widely used in critical electrical installations due to their enhanced mechanical strength, fire resistance, and longevity.
The primary focus of IEC 60702-2 is to define performance, construction, testing, and marking criteria for terminations-devices that ensure secure and safe connection points at the end of MI cables without compromising the cable's mineral insulation properties. This standard supports consistent international usage and quality assurance for terminations in environments requiring robust electrical integrity and safety.
Key Topics
- Scope and Application: Sets requirements for terminations matched to MI cables complying with IEC 60702-1 and rated up to 750 V.
- Components of Terminations:
- Seals: Designed to prevent moisture ingress, ensure electrical insulation between conductors and the metallic sheath, and may provide a protective conductor connection.
- Glands: Devices securing the cable within electrical installations; they may facilitate earth continuity depending on design and material.
- Construction Requirements:
- Materials must be resistant to corrosion and suitable for operation in explosive atmospheres where applicable.
- Seal and gland designs must maintain insulation integrity under specified temperature ranges.
- Marking and Identification:
- Packaging for terminations must include the standard number (IEC 60702-2), manufacturer identification, and product specification details.
- Seals and glands require clear markings ensuring traceability and proper installation.
- Type Testing:
- Mandatory tests include voltage withstand, insulation resistance, insulation integrity, temperature cycling, tensile strength, and earth continuity.
- Test protocols ensure performance consistency and reliability before commercial deployment.
- Definitions and Terminology:
- Precise definitions for terms like termination, seal, gland, and type tests ensure uniform understanding for manufacturers and users.
Applications
IEC 60702-2 standardizes the quality and performance of terminations used in mineral insulated cables for various low-voltage electrical systems, typically in industrial, commercial, and residential installations. Its practical applications include:
- Fire-resistant wiring systems - Safeguarding critical power and control circuits during fire conditions.
- Explosive atmosphere environments - Terminations designed per this standard are compatible with certain hazardous locations, ensuring safety.
- High-reliability installations - Power plants, chemical plants, tunnels, and transportation systems benefit from the robust and durable termination standards.
- Electrical infrastructure maintenance and upgrades - Facilitates replacement and standardization of cable terminations while maintaining safety and system integrity.
Adhering to IEC 60702-2 assists engineers, electricians, and manufacturers in ensuring secure cable ends that do not compromise the mineral insulation’s properties, maintaining safety and performance for the duration of the cable’s lifespan.
Related Standards
- IEC 60702-1: Specifies constructions and requirements for mineral insulated cables rated up to 750 V, to which terminations must conform.
- IEC 60079-0: Covers general requirements for electrical apparatus in explosive atmospheres, referenced for seals and glands suitable in hazardous conditions.
- IEC 60364-5-54: Addresses earthing systems and protective conductors relevant for ensuring earth continuity in cable terminations.
- IEC 60423: Defines conduit systems and thread forms associated with cable glands, critical for gland standardization.
Utilizing IEC 60702-2 alongside these standards guarantees comprehensive compliance for mineral insulated cable systems, enhancing global compatibility, safety, and performance.
Keywords: IEC 60702-2, mineral insulated cables, MI cable terminations, low-voltage cables, cable seals, cable glands, electrical terminations, voltage not exceeding 750 V, cable sealing, cable connection standards, mineral insulation integrity, cable termination testing, electrical safety standards.
