BS EN 81-28-2018 pdf free 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 Safety requirements and/or protective measures
4.1 General
4.1.1 Introduction Alarm systems shall comply with the safety requirements and/or protective measures of Clause 4. In addition, alarm systems shall be designed according to the principles of EN ISO 12100 for hazards relevant but not significant which are not dealt with by this document.
4.1.2 Alarms The alarm equipment shall ensure that subject to 4.1.6 alarm filtering, the full alarm information (see 4.1.7) 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 if the communication is interrupted any reemission after acknowledgement shall not be impeded by the 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 reemission.
4.1.3 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.
4.1.4 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.
4.1.5 Information in the lift car
The alarm system shall be equipped with visible and audible signals, integrated in or above the car operating panel, consisting of:
a) a yellow graphical symbol in accordance with ISO 4190‑5:2006, Table C.1, No 1, illuminated when an alarm has been validated as a true alarm, i.e. after the end of filtering, until the end of alarm;
b) an audible signal with a sound pressure level at 1m from the source between 35 dB(A) and 65 dB(A) adjustable to suit the site conditions when an alarm has been validated as a true alarm, i.e. after the end of filtering, until the voice communication is established. The acoustic signal is not required to be continuous;
c) a green graphical symbol in accordance with ISO 4190‑5:2006, Table C.1, No 8., illuminated during voice communication.
See Figure 1 which clarifies the operation of the visible and audible signals.
4.1.6 Alarm filtering
Provision shall be made to enable the alarm system to filter alarm initiations.
For this purpose, the filter shall be capable of not initiating the alarm when any of the following events occur:
— when the car is in an unlocking zone and the car and landing doors are fully open, or in the case of hinged landing doors, the car doors are fully open and landing doors are unlocked;
— the car is running.
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.
4.1.8 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.BS EN 81-28 pdf download.