BS/EN 81-28-2018 pdf download.Safety rules for the construction and installation of lifts – Lifts for the transport of persons and goods Part 28: Remote alarm on passenger and goods passenger lifts.
4.12 Alarms
The alarm equipment shall ensure that subject to 4LL alarm filtering, the full alarm information (see 41Z) will be emitted until acknowledgement, even during maintenance.
If an emission fails before acknowledgement, the delay between re-emission(s) shall be reduced to the minimum compatible with the communication network.
Where the characteristics of the communication network require (see EN 81 – 20:2014. 0.4.2 e)) and I the communication is interrupted any re emission after acknowledgement shall not be impeded by h alarm equipment. The alarm system shall be able to accept communication from the rescue service until the end of the alarm has occurred.
Emission of the alarm information to the transmitter shall not be delayed, except during alarm filtering.
Between the acknowledgement and the end of alarm, any alarm filtering shall be bypassed.
After acknowledgement, if the communication is interrupted, the alarm equipment shall stop automatic re emission.
4.13 End of alarm
Means shall be provided to enable indication, from the alarm system to the rescue service, that the alarm has been dealt with and no user is trapped in the lift.
The end of alarm shall be initiated from the lift installation to which the alarm belongs. The means to initiate the end of alarm shall be accessible only to competent persons.
Remote resetting of the alarm equipment shall be possible.
4.14 Emergency electrical power supply
Any alarm shall not be impeded or lost even in cases of electrical power supply switching or power supply failure.
Where an emergency electrical power supply is used, means shall be provided to automatically inform the rescue service and to indicate at the installation of the failure of the emergency electrical power supply. This is considered to occur whenever the emergency electrical power supply is incapable of holding sufficient capacity to provide one hour of function of the alarm system including 15 minutes voice communication.
If the transmitter is integrated in the alarm system (e.g. GSM-module), the requirements of the standard regarding the emergency electrical power supply apply to the transmitter.
The alarm system may also be designed to filter alarm initiations if the alarm initiation device is pressed for a time shorter than 3 s.
In order to allow manual testing of the alarm system, the filter shall be bypassed when alarm initiation device is continuously pressed for an adjustable time not longer than 30 s. However, no alarms initiated during maintenance and/or repair shall be discarded.
The alarm system shall also provide means to deactivate and reactivate filtering of the alarm by competent and authorized person.
4.1.7 Identification
The alarm equipment shall enable the rescue service to identify the lift even when testing.
4.12 Communication
After initiation of the alarm initiation device, no further action from the trapped users shall be necessary.
After initiation of the alarm, the user shall not be able to interrupt the 2 -way communication. The user shall always, during the alarm, be able to re – initiate it.
The voice communication equipment shall be adjustable to suit the site conditions
Any additional sound sources (e.g. music, alarm bell) shall not impede the voice communication.
NOTE Refer to EN 81-70 for induction loop.
4.2 Technical characteristics
4.2.1 Availability / reliability
The alarm system shall be able to operate at all times when the lift is intended to be accessed by users
(see EN 81 20:2014. 0.4.2).
The alarm equipment shall be able to emit alarm information to alternative reception equipment.
The alarm equipment shall automatically simulate the input signal of an alarm (automatic test) and set up the subsequent connection, using the same connection means used for an alarm, to the reception equipment for testing purposes as frequently as agreed with the owner of the installation but at least every 3 days.
The graphical symbols detailed in 4L1. flashing in opposition (one second off, one second on) shall indicate a failure of automatic test not later than one hour from the last failed automatic test up to next successful connection.BS/EN 81-28-2018 pdf download.

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