Last edited 10 Oct 2017

Protected circuit

The building regulations Approved Document B2, ‘Fire safety: Buildings other than dwellinghouses’, defines a protected circuit as:

An electrical circuit protected against fire.

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.

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 should be separate from other circuits.

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[edit] External references

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