- Project plans
- Project activities
- Legislation and standards
- Industry context
Last edited 07 Nov 2019
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.
 Related articles on Designing Buildings Wiki
- Amendment 3 BS 7671 Requirements for Electrical Installations IET Wiring Regulations.
- Approved document B.
- Approved document P.
- Approved documents.
- Articles by the Electrical Contractors' Association (ECA).
- Building regulations.
- Consumer unit.
- Electrical appliance.
- Electrical control systems.
- Electrical drawing.
- Electrical engineer.
- Glossary of electrical terms.
 External references
- BS 5266-1.
- BS 5839-1.
- BS 7346-6.
- BS EN 50200:2006.
Featured articles and news
A review of Scotland’s historic lighthouses.
Choosing the most suitable heating system.
Another year of growth, says BSRIA.
Property practices to help tenant retention.
Fire rips through HPL cladding in Bolton.
Disturbing complacency over short courses.
The new science of building engineering physics.
How new technologies and processes could impact on energy efficiency and wellbeing.
BRE launches the BREEAM Data Centres Annex Pilot.
Replacing lanterns and overthrows in Great Pulteney Street.
Will market-led regeneration work without state intervention?
The New Towns