Thanks Bill. The customer does not have any design info so I have pointed out that he needs this and a log book. He has asked me to test and provide design certification, a log book and to set up testing procedures for them. Looking at BS5266 the design does appear to be up to minimum standard, I was just unsure about the duration of testing with the three-hour luminaires being in place for what in my opinion is a one-hour requirement. I take it I can replace these with one-hour units, or do I need to confirm this with the Fire Officer?
Um......you can't produce a design cert for the existing install - only a maintenance cert - as you didn't install the system. A log book is mandatory, for coplaince with the BS, and to prove testing has been carried out (if it's filled in, of course!).
It's unlikely to comply if it was installed in 1989 - minimum lux levels have changed a fair bit since then, and it's unlikely luminaries that old will produce the required output unless they've been well maintained, and happen to be spaced correctly (most aren't). The only way you'll confirm that is by carrying out a duration test, and by use of a lux meter throughout the premises over the duration of the test - and just for clarity, the lux levels must be right at the end of the duration test, as well as at the start...
The time requirement would be confirmed by a full fire risk assessment, which I assume the church has in place? If not, it may be failing to comply in any case - and that's a prosecutable offence, more so given it's a public building.
If you're going to replace with one hour duration units, you are altering the system design, and hence WOULD become responsible for the design element of the installation too - therefore, you'd need to ensure the whole system per se, met the design requirements, including light levels, spacing, etc - you're effectively installing a replacement system at this point as it isn't like for like.
To be honest with you, all I'd commit to initially would be a test and report...with a view to probably having to install a new system meeting the requirements of both the standard and the Fire Risk Assessment - which may well be a one hour rated system, depending on the size and use of the building.
The Fire Officer covering the site may well be able to offer advice on his expectations, but will, again in all honesty, probably refer you back to the FRA in the first instance, and he'll also take an interest in what other precautions are in place - i.e. fire alarm, extinguishers, signage, etc.