Meaning of para 5.18 of the ADB

[Tom Sutton]

Stu's post script was bang on but Kurnal yours is giving me some problems have you included another layer of encryption?

[kurnal]

Sorry guys it was the use of punctuation that threw me, we never had to use that so I never learned it.

TW my message would mean something to the short wave radio fraternity.

[Tom Sutton]

Point taken Kurnal I even have trouble with the short hand they use when texting.

[wee brian]

BS 7036-2:1996 says something along the lines of;

11 Operation upon mains power
interruption
11.1 A monitored back-up system should be
provided for use in case of mains power
interruption.
11.2 The monitoring system for the supervision of
stored energy within the back-up system should
ensure that the energy level stored is enough for at
least one opening or closing operation.
11.3 This check should be carried out immediately
after mains power connection and then at least once
every 4 h.
11.4 If the check is not carried out, or the result of
the check is negative, then the powered door should
adopt a predetermined safe position.

[Phoenix]

Interesting.   

Do you know how this is achieved, Brian?  Do all sliding doors conform to this?

Stu

[kurnal]

Wee B Many thanks and I admit I had not considered para 11.

In my defence it strikes me as odd that para 9 - Means of escape does not refer to para 11 either!  As I read it Para 9 says something like If powered sliding or folding doors are proposed for
installation on an escape route and are intended as means of escape doors, then the doors should be capable of manual break-out (see clause 10) in the direction of escape. Alternatively, the doors should be linked to an automatic fire detection system that opens the doors on activation of the fire detection system or failure of the power supply.

Now because of the dates of the relevant standards there is no reference to BS 7273 part 4  whatsoever. And how on earth is the fire detection system supposed to also monitor the mains supply local to the door?

And there is no mention of a green emergency door release box anywhere in BS7036.

I suggest this standard is long overdue for revision.

[CivvyFSO]

Kurnal, just noticed this too, from 7273-4:

"In Category A and B actuation, in view of the fail-safe nature of the critical
signal path, normally there is no need for additional monitoring to ensure
indication of faults."

[kurnal]

Thanks Civvy will take a look. But presumably since 7273 part 4 only covers the interface between a device and the alarm system it will not be referring to any monitoring of the door opening device itself?