Our Voltimum Experts answer your questions on a daily basis in our Technical Expertise area. This Question of the Day, concerning an L2 Grade A fire detection system installed in HMO property, is answered by the ECA:
1. When, if ever, was it allowable to install non-fire rated cables for use with an L2 Grade A fire detection system installed in HMO property?
2. What would be the outcome of a PIR carried out on a system installed using twin and earth cables in the above-mentioned circuits?
Please note that I'm aware of the current regulations regarding the use of fire retardant cables
Answer by ECA:
For (1), about 15-20 years ago.
For (2), a note should be included on PIR stating that the fire alarm system was installed to an earlier edition of the standard, if that is the case. This should also be reviewed as part of the building Fire Risk Assessment by the Responsible Person, who should give recommendations.
Answer by NICEIC:
For (1), BS 5839 Part 1: 1988 listed twin and earth cables (BS6004) as acceptable cable types. This standard was superseded by the 2002 version around July 2003. Therefore, if the system was designed and installed before July 2003, then it would have had to meet the 1988 standard.
For (2), The NICEIC guidebook on completing specialised reports (stockcode GSC), advises that a Code 4 recommendation would be appropriate for the example given (p132). However, the inspector concerned would have to use his/her own engineering judgement when making any decision.
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