We have recently had a FRA on a single staircase over 11m (but below18m) block of flats. We are told the sounders need to be removed for a 'stay put' strategy but smoke detectors retained.

Q : do we need to replace domestic twin & earth cabling to these detectors with fire proof/resistant wiring ?

Q : is there a legal requirement for an AOV or can we convert to a MOV ?

Q : is there a legal requirement for signage in this single staircase, single exit, less than 9m run scenario ?

Any help would be greatly appreciated, thanks.

Q : do we need to replace domestic twin & earth cabling to these detectors with fire proof/resistant wiring ? If cable failure would cause the AOV to fail  safe to the open position then no, otherwise yes

Q : is there a legal requirement for an AOV or can we convert to a MOV ? No, if the existing installation is an AOV you can't make something worse than original, just equal or better

Q : is there a legal requirement for signage in this single staircase, single exit, less than 9m run scenario ? No requirement for fire exit signage, no requirement for floor and flat numbering if an existing building (but good practice), fire instructions notice required near entrance or on notice board, etc

Thanks very much for your reply Anthony, much appreciated information.

Colin