Cable fixing and the 18th Edition IET Wiring Regulations

Published on: 7 February 2020

The new 18th Edition of the IET Wiring Regulations (BS 7671) came into effect in January 2019. A year on, installers are getting used to the new regulations, but here’s a reminder of what changed and what it means for the fixing of wiring systems.

What are the requirements of the 18th Edition for cable fixing?

1 – Locations where additional cable support is required

In previous regulations, the requirement for additional support of wiring systems was stated only to be necessary in “escape routes”. In the 18th Edition, this terminology was changed to state that additional support is required in “access or egress routes”. What does this mean? It means that not only escape routes must be well protected, but also any entry routes into the building.

2 – What type of clips can be used

The 18th Edition also explicitly states that plastic clips cannot be used as the sole or “main” method of support for cables in entry and exit routes. Metallic fixing must also be used to reduce the risk of cable fixings failing and causing obstruction.

3 – Spacing of metal clips

When fixing cables to exposed horizontal surfaces, the spacing of metal fixings should be approximately every 300mm. For vertical running cables that are exposed, a metal clip every 400mm is recommended. Plastic fixings can be used in addition to the recommended number of metal fixings, but should not be used without them.

4 – Fixing of cable bundles

It is recommended that larger cables and cable bundles are fixed within metal cable containment. The use of metal fixings such as stainless-steel ties in conjunction with metal containment ensures maximum compliance with the 18th Edition.

Britclips Flange

 

Walraven’s range of Britclips® Electrical Fixings are made of spring steel CS70 and are suitable for use in entry and exit routes as long as they are installed in accordance with the 18th Edition guidelines.

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