Rodney - good point, so in my original post, for DNO read BS7671. To-date this kept the NICEIC assessors happy - although they have been known to change their minds!
Rodney
Got it. So your smokes are running off the 1st floor lighting circuit, albeit that the first outlet is the ground floor alarm. I'll probably stick to installing a sw fcu though, because I know that if challenged I can quote the IEE Guide to Building Regs publication. Also, I'm not...
Explanation given to me by NICEIC as follows:
"Supply Characteristics Ze" = DNO maximum (i.e. 0.35 for TNCS, 0.8 for TNS) ;
"Particulars of installation at origin Ze" = your measured Ze.
Hi Amateursparky
Not wishing to upset other posters, but the Fire Safety (Approved Doc B) contains the following in relation to smoke and heat alarms:
"The detectors and alarms are required to be permanently wired with an independent circuit to the distribution board (cu), or preferably...
I'm Brian, an NICEIC member focussing on domestic and light commercial (which is all there is around here!) based on the Hants/Surrey/West Sussex borders. Am also going through the micro-generation scheme registration for solar PV.