Last edited 07 Nov 2019

Protected circuit

Approved document B, Fire Safety, Volume 2, Buildings other than dwellinghouses (2019 edition), defines a protected circuit as:

An electrical circuit that is protected against fire.

Cabling should at least meet the requirements of PH 30 classification or an equivalent standard and should only pass through parts of the building in which fire risk is negligible.Protected circuits are required where it is critical that an electrical circuit continues to operate during a fire. This should include the use of sufficiently robust cables, careful selection of cable routes, and/or by the provision of physical protection in areas where cables may be susceptible to damage. Cable supports should generally be non-combustible and such that circuit integrity will not be reduced below that afforded by the cable.

Protected circuits should be separate from other circuits.

[edit] Related articles on Designing Buildings Wiki

[edit] External references

  • BS 5266-1.
  • BS 5839-1.
  • BS 7346-6.
  • BS EN 50200:2006.