News & blogs
Back
New commented version of standard on cable cleats for electrical installations
cleat.jpg
Non-metallic cable cleat for three cables in trefoil formation with integral ladder rung clamp

Cable cleats are used to fix, clamp and support electric cables to ensure safety. They can also provide protection by limiting cable movement during electrical fault conditions.

The new Commented Version of IEC 61914:2021 CMV, Cable cleats for electrical installations, specifies requirements and tests for cable cleats used for securing cables in electrical installations and for intermediate restraints used for holding cables together in formation in electrical installations.

“Twenty years ago there were no standards for cable cleats,” says IEC TC 23/SC 23A/MT 16 convenor Steve Boyd. “Each manufacturer had their own way of testing and declaring the performance of their products.

“The development of EN 50368 and its evolution into IEC 61914 under the guidance of Chris Calvert, my predecessor as convenor, has given a uniform set of type tests for manufacturers to declare the performance of their products.  It also enables specifiers and users to compare different products more easily and should enable them to readily select the most suitable cleat for their application.”

The commented version clearly identifies the differences between the previous version of the standard and the new edition, and also provides comments on each of the main technical changes. Some of those changes include the addition of:

  • new corrosion resistance classes for plated products

  • new requirements and tests for durability and legibility of markings

  • new test requirements for axial load testing of cleats for more than one cable

  • lateral load test requirements for intermediate restraints

Cable cleats are used in low, medium and high voltage power cable systems and installed at intervals along circuits to secure electrical installations. Examples include:

  • low–computer networks, phones, lighting, alarm systems, security cameras and instrumentation

  • medium–substation equipment, for distribution of power in industrial settings and in mining to supply power to drills, shovels, hauliers
  • high–power plants, power transmission, solar and wind industries.

They are deployed in diverse environmental conditions (onshore and offshore) and industrial applications. The primary aspect to consider when choosing a cable cleat is the outside cable diameter around the cable sheath. Where single-core cables that may be subjected to high fault currents are installed, the short circuit forces the cleat could be subjected to during fault conditions must be taken into account. Additional performance considerations may be corrosion and fire resistance. 

“There has been an increase in the underground installation of sections of HV distribution grids in recent years,” observes Mr Boyd.  “This can result in the need for bespoke cleat designs for some of these projects. 

“The extension of the short-circuit test to cover testing with higher voltage cables in the new edition of IEC 61914 should simplify the specification, testing and selection process of cable cleats for these installations”.

IEC Technical Committee 23 develops standards for electrical accessories. IEC 61914 was published by Subcommittee 23A, for cable management systems, which covers products and systems used for the management of all types of cables, information and communication lines, electrical power distribution conductors and associated accessories.

Recents Posts

Blog digest

Sign up to receive selected stories