Tel: 01623 645 007

Flexishield Cable
Flexishield logo
Developed for use in partitions and building voids

Standards and What They Mean

Wiring Regulations BS 7671:2018

The principle changes to the Wiring Regulations BS7671:2018 that effect concealed cables are:

The relevant regulation clause numbering has changed to 522.6.201 – 522.6.204.

BS7671The latest IET Wiring regulations were issued in July 2018. Cables made to BS 8436:2011 continue to be a satisfactory option for the protection of concealed  cables at a depth of less than 50mm. This can be seen in Regulations 522.6.201 to 522.6.204





BS 8436 was released in August 2004, knowledge of the BS 8436 standard has slowly filtered into the fixed electrical wiring sector, it did feature in the 16th Edition of the Wiring regulations but now has a more prominent role as a safety cable for concealed cables in the 17th Edition and still remains as a key cable option for this application.

Scope of the standard is:

Three principle performance criteria called up in BS 8436:2011 are:

Nail Test: A 0.9kg a weight dropped from a height of 400mm driving a steel nail through the cable, the cable is deemed to have passed if it operates up to a 32A Type B MCB in six consecutive valid strikes.
Impact test: A 0.5kg chisel-edged weight is dropped from a height of 250mm and the cable shall maintain its electrical integrity. The same is done with a radiused weight. The test is carried out at 20° C.
Water immersion test: A 20m sample of cable is immersed into water at 20° C for 24 hours. The cable’s electrical integrity is tested following this.



An existing Irish standard that was modified to include cable failing safe under nail penetration, this standard addition was based on BS8436, but has a number of important differences: 

Scope of the standard is:

The principle performance criteria called up in IS 273 are basically the same as used in BS8436.