crafty, i dont know really, quote i posted is from 5839-1 2002 maybe they think people with these keys are responsible? joe public normally dont have them so i guess they are rare in real terms. ask all your friends and relatives bet most wont even have heard of or seen one.
and i've bought a pack of assorted screwdriver bits for tamper proof screws in maplin.
fact is if your troublemaking is premeditated and you know what to look for you can get practically any tool you wan't but afaict most ordinary vandals don't plan like that.
you can get FCUs designed to resist use of normal screwdrivers, i belive MK do one.
also note that the regs entry only says should not must.
I'm thinking the spirit of the regulation is so it can't be accidentally switched off, whereas a bog standard switched fused spur unit can be accidenatally knocked off by say a cleaner, with a fishtail keyswitch is unlikely to happen.
I must admit this is the first time I have heard of DP switching for fire alarm panels, I can't understand the spirit of this regulation as normally the first thing inside the main panel is normally an ELV transformer, also the only people who will need to go in there are qualified, firemen don't need to go inside the panel do they?
I know of one job I did where the firemen had opened the panel to disconnect the mains and the batteries, because they didn't have the access code to silence the panel
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