Safety rules for the construction and installations of lifts - Particular applications for passenger and goods passenger lifts - Part 77: Lifts subject to seismic conditions

This document specifies the special provisions and safety rules for passenger and goods passenger lifts where these lifts are permanently installed in buildings that are in compliance with EN 1998-1 (Eurocode 8).
This document defines additional requirements to EN 81-20 and EN 81-50.
It applies to new passenger lifts and goods passenger lifts. However, it can be used as a basis to improve the safety of existing passenger and goods passenger lifts.
This document does not introduce any additional special provisions and safety rules for lifts which are in Seismic lift category 0 as defined in Annex A, Table A.1.
This document does not address other risks due to seismic events (e.g. fire, flood, explosion).

Sicherheitsregeln für die Konstruktion und den Einbau von Aufzügen - Besondere Anwendungen für Personen- und Lastenaufzüge - Teil 77: Aufzüge unter Erdbebenbedingungen

Dieses Dokument legt die besonderen Vorkehrungen und Sicherheitsregeln für Personen- und Lastenaufzüge fest, wenn diese Aufzüge dauerhaft in Gebäuden eingebaut sind, die EN 1998-1 (Eurocode 8) entsprechen.
Dieses Dokument legt zusätzliche Anforderungen zu EN 81-20 und EN 81-50 fest.
Sie gilt für neue Personenaufzüge und Lastenaufzüge. Sie kann jedoch auch als Grundlage zur Verbesserung der Sicherheit bestehender Personen- und Lastenaufzüge herangezogen werden.
Dieses Dokument führt keine zusätzlichen besonderen Festlegungen und Sicherheitsregeln für Aufzüge der Erdbebenkategorie 0 nach Anhang A, Tabelle A.1, ein.
Dieses Dokument behandelt andere mit Erdbebenereignissen einhergehende Risiken (zum Beispiel Brand, Überflutung, Explosion) nicht.

Règles de sécurité pour la construction et l’installation des élévateurs - Applications particulières pour les ascenseurs et les ascenseurs de charge - Partie 77 : Ascenseurs soumis à des conditions sismiques

Le présent document spécifie les dispositions spéciales et les règles de sécurité relatives aux ascenseurs et ascenseurs de charge installés de manière permanente dans des bâtiments qui sont conformes à l’EN 1998‐1 (Eurocode 8).
Le présent document définit des prescriptions supplémentaires par rapport à l’EN 81‐20 et l’EN 81‐50.
Il s’applique aux nouveaux ascenseurs et ascenseurs de charge. Cependant, il peut être utilisé comme base pour améliorer la sécurité des ascenseurs et ascenseurs de charge existants.
Le présent document n’introduit pas de dispositions spéciales ni de règles de sécurité supplémentaires pour les ascenseurs sismiques de catégorie 0 tels que définis dans le Tableau A.1 de l’Annexe A.
Le présent document ne traite pas des autres risques associés aux événements sismiques (par exemple incendie, inondation, explosion).

Varnostna pravila za konstruiranje in vgradnjo dvigal (liftov) - Posebne izvedbe osebnih in tovorno-osebnih dvigal - 77. del: Dvigala (lifti) za potresne razmere

Ta evropski standard določa posebna določila in varnostna pravila za osebna in tovorno-osebna dvigala, pri čemer so ta dvigala trajno vgrajena v stavbah, ki so v skladu s standardom EN 1998-1 (Evrokod 8).
Ta standard določa dodatne zahteve za standarda EN 81-1 in EN 81-2.
Uporablja se za nova osebna in tovorno-osebna dvigala. Lahko se uporablja tudi kot osnova za izboljšanje varnosti obstoječih osebnih in osebno-tovornih dvigal.
Ne uporablja se za dvigala za potresne razmere kategorije 0, kot je opredeljeno v preglednici A.1.
Ta evropski standard ne obravnava drugih tveganj zaradi potresnih dogodkov (na primer požar, poplave, eksplozije).

General Information

Status
Published
Publication Date
13-Nov-2018
Current Stage
6060 - Definitive text made available (DAV) - Publishing
Due Date
14-Nov-2018
Completion Date
14-Nov-2018

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SLOVENSKI STANDARD
SIST EN 81-77:2019
01-april-2019
1DGRPHãþD
SIST EN 81-77:2014
Varnostna pravila za konstruiranje in vgradnjo dvigal (liftov) - Posebne izvedbe
osebnih in tovorno-osebnih dvigal - 77. del: Dvigala (lifti) za potresne razmere

Safety rules for the construction and installations of lifts - Particular applications for

passenger and goods passenger lifts - Part 77: Lifts subject to seismic conditions

Sicherheitsregeln für Konstruktion und Einbau von Aufzügen - Besondere Anwendungen

für Personen- und Lastenaufzüge - Teil 77: Aufzüge unter Erdbebenbedingungen

Règles de sécurité pour la construction et l’installation des élévateurs - Applications

particulières pour les ascenseurs et les ascenseurs de charge - Partie 77: Ascenseurs

soumis à des conditions sismiques
Ta slovenski standard je istoveten z: EN 81-77:2018
ICS:
91.120.25 =DãþLWDSUHGSRWUHVLLQ Seismic and vibration
YLEUDFLMDPL protection
91.140.90 'YLJDOD7HNRþHVWRSQLFH Lifts. Escalators
SIST EN 81-77:2019 en,fr,de

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN 81-77:2019
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SIST EN 81-77:2019
EN 81-77
EUROPEAN STANDARD
NORME EUROPÉENNE
November 2018
EUROPÄISCHE NORM
ICS 91.120.25; 91.140.90 Supersedes EN 81-77:2013
English Version
Safety rules for the construction and installations of lifts -
Particular applications for passenger and goods passenger
lifts - Part 77: Lifts subject to seismic conditions

Règles de sécurité pour la construction et l'installation Sicherheitsregeln für die Konstruktion und den Einbau

des élévateurs - Applications particulières pour les von Aufzügen - Besondere Anwendungen für

ascenseurs et les ascenseurs de charge - Partie 77 : Personen- und Lastenaufzüge - Teil 77: Aufzüge unter

Ascenseurs soumis à des conditions sismiques Erdbebenbedingungen

This European Standard was corrected and reissued by the CEN-CENELEC Management Centre on 5 December 2018.

This European Standard was approved by CEN on 18 June 2018.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this

European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references

concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN

member.

This European Standard exists in three official versions (English, French, German). A version in any other language made by

translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management

Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,

Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,

Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,

Turkey and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATIO N
EUROPÄISCHES KOMITEE FÜR NORMUN G
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels

© 2018 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 81-77:2018 E

worldwide for CEN national Members.
---------------------- Page: 3 ----------------------
SIST EN 81-77:2019
EN 81-77:2018 (E)
Contents Page

European foreword ....................................................................................................................................................... 4

0 Introduction ...................................................................................................................................................... 5

1 Scope .................................................................................................................................................................... 6

2 Normative references .................................................................................................................................... 6

3 Terms and definitions ................................................................................................................................... 6

4 List of significant hazards ............................................................................................................................ 8

5 Safety requirements and/or protective measures ............................................................................. 8

5.1 General ................................................................................................................................................................ 8

5.2 Lift well ............................................................................................................................................................... 8

5.3 Machinery and pulley spaces ...................................................................................................................... 9

5.4 Car ...................................................................................................................................................................... 10

5.4.1 Mass of the car for lift design calculations .......................................................................................... 10

5.4.2 Car retaining devices .................................................................................................................................. 10

5.4.3 Car door locking devices ............................................................................................................................ 11

5.5 Counterweight or balancing weight ...................................................................................................... 11

5.6 Suspension and compensation ................................................................................................................ 12

5.6.1 Protection for traction sheaves, pulleys and sprockets ................................................................. 12

5.6.2 Compensation means .................................................................................................................................. 12

5.7 Precaution against environmental damage ....................................................................................... 12

5.8 Guide rail system .......................................................................................................................................... 12

5.8.1 General ............................................................................................................................................................. 12

5.8.2 Permissible stresses and deflections during seismic event ......................................................... 12

5.9 Machinery and other lift equipment ..................................................................................................... 14

5.10 Electric installations and appliances .................................................................................................... 14

5.10.1 Electric installations in the lift well ....................................................................................................... 14

5.10.2 Behaviour of the lift in case of failure of the mains power supply ............................................. 14

5.10.3 Seismic detection system .......................................................................................................................... 14

5.10.4 Behaviour of the lift in seismic mode: .................................................................................................. 16

6 Verification of the safety requirements and / or protective measures .................................... 16

6.1 Technical compliance documentation.................................................................................................. 16

6.2 Verification of design .................................................................................................................................. 16

7 Information for use ..................................................................................................................................... 18

Annex A (normative) Seismic lift categories ................................................................................................... 19

Annex B (informative) General information and determination of the design acceleration ........ 20

B.1 General ............................................................................................................................................................. 20

B.2 Example of calculation of design acceleration................................................................................... 21

Annex C (informative) Primary wave detection system ............................................................................. 22

Annex D (informative) Proof of guide rails ...................................................................................................... 23

D.1 General ............................................................................................................................................................. 23

D.2 Mass of the rated load ................................................................................................................................. 23

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SIST EN 81-77:2019
EN 81-77:2018 (E)

D.3 Seismic forces ................................................................................................................................................. 23

D.4 Load cases ........................................................................................................................................................ 24

D.5 Impact factors ................................................................................................................................................ 25

D.6 Acceleration direction ................................................................................................................................ 25

D.7 Vertical distribution of masses ................................................................................................................ 25

D.8 Car guide rail bending force...................................................................................................................... 26

D.9 Counterweight or balancing weight guide rail bending force ...................................................... 27

Annex ZA (informative) Relationship between this European Standard and the essential

requirements of Directive 2014/33/EU aimed to be covered ..................................................... 28

Bibliography ................................................................................................................................................................. 30

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SIST EN 81-77:2019
EN 81-77:2018 (E)
European foreword

This document (EN 81-77:2018) has been prepared by Technical Committee CEN/TC 10 “Lifts, escalators

and moving walks”, the secretariat of which is held by AFNOR.

This European Standard shall be given the status of a national standard, either by publication of an

identical text or by endorsement, at the latest by May 2019, and conflicting national standards shall be

withdrawn at the latest by November 2020.

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. CEN shall not be held responsible for identifying any or all such patent rights.

This document supersedes EN 81-77:2013.

This document has been prepared under a mandate given to CEN by the European Commission and the

European Free Trade Association, and supports essential requirements of EU Directive(s).

For relationship with EU Directive(s), see informative Annex ZA, which is an integral part of this

document.

The main changes with respect to the previous edition (EN 81-77:2013) are as follows:

— updating of references and their associated requirements with regard to EN 81-20:2014;

— general editorial corrections since the last publication;

— replacement of the Annex ZA with regard to the commission mandate M/549/C(2016) 5844 Final

and Directive 2014/33/EU;
— visual indication of seismic mode (chapter 5.10.3.8);
— replace mass P with PEC in proof of guide rails (Annex D).

This document is part of the EN 81 series of standards: “Safety rules for the construction and installation

of lifts”.

According to the CEN-CENELEC Internal Regulations, the national standards organisations of the

following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia,

Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France,

Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands,

Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and

the United Kingdom.
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SIST EN 81-77:2019
EN 81-77:2018 (E)
0 Introduction
0.1 General

The machinery concerned and the extent to which hazards, hazardous situations and events are covered,

are indicated in the scope of this standard.
This document is a Type C Standard as stated in EN ISO 12100.

When provisions of this C standard are different from those which are stated in type A or B standards,

the provisions of this Type C standard take precedence over the provisions of the other standards, for

machines that have been designed and built according to the provisions of this Type C standard.

0.2 General remarks

0.2.1 The object of this standard is to define additional safety rules related to passenger and goods lifts

with a view to safeguarding persons and objects against the risks described below associated with the

use, maintenance, inspection and emergency operation of lifts subject to seismic conditions.

0.2.2 The aim of this European Standard is to:
— avoid loss of life and reduce the extent of injuries;
— avoid people trapped in the lift;
— avoid damage;
— avoid environmental problems related to oil leakage;
— reduce the number of lifts out of service.
0.3 Principles

Risk analysis, terminology and technical solutions have been considered taking into account the methods

of EN ISO 12100 and EN ISO 14798 standards.
0.4 Assumptions

It is assumed that negotiations have been made for each contract between the customer and the

supplier/installer about the design acceleration (a ) to be considered and the most effective position of

the seismic detection system, if any, and of the primary wave detection system, if any. The building

designer or the lift owner should provide the design acceleration (a ) which will be documented in the

information for the owner provided by the installer.

This European Standard covers only the effects of earthquakes on lifts and not the nature of them.

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SIST EN 81-77:2019
EN 81-77:2018 (E)
1 Scope

This document specifies the special provisions and safety rules for passenger and goods passenger lifts

where these lifts are permanently installed in buildings that are in compliance with EN 1998-1 (Eurocode

8).
This document defines additional requirements to EN 81-20 and EN 81-50.

It applies to new passenger lifts and goods passenger lifts. However, it can be used as a basis to improve

the safety of existing passenger and goods passenger lifts.

This document does not introduce any additional special provisions and safety rules for lifts which are in

Seismic lift category 0 as defined in Annex A, Table A.1.

This document does not address other risks due to seismic events (e.g. fire, flood, explosion).

2 Normative references

The following documents are referred to in the text in such a way that some or all of their content

constitutes requirements of this document. For dated references, only the edition cited applies. For

undated references, the latest edition of the referenced document (including any amendments) applies.

EN 81-20:2014, Safety rules for the construction and installation of lifts - Lifts for the transport of persons

and goods - Part 20: Passenger and goods passenger lifts

EN 81-50:2014, Safety rules for the construction and installation of lifts - Examinations and tests - Part 50:

Design rules, calculations, examinations and tests of lift components

EN 81-72:2015, Safety rules for the construction and installation of lifts - Particular applications for

passenger and goods passenger lifts - Part 72: Firefighters lifts

EN 81-73:2016, Safety rules for the construction and installation of lifts - Particular applications for

passenger and goods passenger lifts - Part 73: Behaviour of lifts in the event of fire

EN ISO 12100:2010, Safety of machinery - General principles for design - Risk assessment and risk reduction

(ISO 12100:2010)

ISO 7465:2007, Passenger lifts and service lifts - Guide rails for lift cars and counterweights - T-type

3 Terms and definitions

For the purposes of this document, the terms and definitions given in EN 81-20:2014 and EN 81-50:2014

and the following apply.
3.1
snag point
point of interference between flexible elements and fixed

Note 1 to entry: Examples of flexible elements are ropes, chains, travelling cable.

Note 2 to entry: Examples of fixed elements are guide rail brackets, guide rail clip bolts, fishplates, vanes, and

similar devices.
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SIST EN 81-77:2019
EN 81-77:2018 (E)
3.2
design acceleration

horizontal acceleration to be used for calculation of forces – moments acting on lift systems and arising

from seismic events
Note 1 to entry: See Annex B.
3.3
seismic lift categories

categories in which lifts have been divided, taking into account the design acceleration (a )

Note 1 to entry: Table A.1 shows the seismic lift categories.
3.4
primary wave
compressional wave that is longitudinal in nature

Note 1 to entry: Earthquake advance warning is possible by detecting the non-destructive primary waves that

travel more quickly through the Earth's crust than do the destructive secondary waves. The amount of advance

warning depends on the delay between the arrival of the primary wave and other destructive waves, generally in

the order of seconds for distant, large quakes.
3.5
secondary wave

shear wave that is transverse in nature, its motion being perpendicular to the direction of wave

propagation

Note 1 to entry: Secondary waves move through solids, unlike surface waves. They are destructive and arrive

later than primary waves.
3.6
seismic trigger level
seismic acceleration which activates a seismic detection system
3.7
seismic mode
special mode in which the lift operates after detection of seismic trigger level
3.8
seismic stand-by mode

special mode in which the lift operates after detection of primary wave without the activation of the

seismic detection system
3.9
normal operation

operation mode in which the lift operates when not in seismic mode or in seismic stand-by mode

3.10
retaining device

mechanical device securely fixed to a structural member of the lift car, counterweight or balancing weight

frame, designed to retain the lift car and counterweight (balancing weight) within its guide rails during

seismic activity
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SIST EN 81-77:2019
EN 81-77:2018 (E)
3.11
expansion joint

assembly designed to safely absorb the heat-induced expansion and contraction of various construction

materials, to absorb vibration, or to allow movement due to ground settlement or earthquakes

4 List of significant hazards

This clause contains all the significant hazards, hazardous situations and events, as far as they are dealt

with in this standard, identified by risk assessment as significant for this type of machinery and which

require action to eliminate or reduce the risk (see Table 1).
Table 1 — List of significant hazards
No Hazards Relevant clauses
as listed in EN ISO 12100:2010, Annex B
Acceleration, deceleration 5.4.1, 5.5, 5.8.2
Angular parts 5.2
Approach of a moving element to a fixed part 5.4.2, 5.5
Machinery mobility 5.3, 5.9
Moving elements 5.4.1, 5.4.3
Rotating element 5.6.1, 5.6.2, 5.9
2 Failure of the power supply 5.10.2, 5.10.3.5
8 Human behaviour Clause 6, Clause 7
Pollution 5.7, 5.9
Failure of the control circuit 5.10.3.4, 5.10.3.5
5 Safety requirements and/or protective measures
5.1 General

Passenger and goods passenger lifts shall comply with the safety requirements and/or protective

measures of the following clauses when the lifts are subject to seismic conditions. In addition, passenger

and goods passenger lifts shall be designed according to the principles of EN ISO 12100 for hazards

relevant but not significant that are not dealt with by this document.

If not differently specified, the following requirements apply to Seismic lift category 1, 2 and 3.

5.2 Lift well

In order to prevent that suspension ropes, overspeed governor ropes, travelling cables, compensation

ropes and chains, swaying in the well get entangled with fixed equipment, snag points created by

brackets, sills, devices and other equipment mounted in the well shall be protected according to Table 2.

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SIST EN 81-77:2019
EN 81-77:2018 (E)
Table 2 — Protection of snag points
Height Horizontal distance Lift parts Protective measures Remarks
of the between snag
well points and lift parts
≤ 20 m Not necessary
< 900 mm Travelling cables Install protection Required if any
measures for example portion of the loop
a protection wire in is smaller than
the corner of the rail 900 mm from a
bracket or other snag snag point
points near the
travelling cables
< 750 mm Compensating Install protection Full travel
Chain(s) measures for example
a protection wire in
Compensating
the corner of the rail
rope(s)
bracket or other snag
Counterweight
points
> 20 m
overspeed governor
rope
≤ 60 m
< 500 mm Car overspeed Install protection Full travel
governor rope measures for example
a protection wire in
the corner of the rail
bracket or other snag
points
< 300 mm Suspension ropes Install protection Full travel
measures for example
a protection wire in
the corner of the rail
bracket or other snag
points
> 60 m Protect all snag points Travelling cables Install protection Full travel
independently from measures for example
Compensating
horizontal distance a protection wire in
Chain(s)
the corner of the rail
Compensating
bracket or other snag
rope(s)
points
Counterweight
overspeed governor
rope
Car overspeed
governor rope
Suspension ropes
5.3 Machinery and pulley spaces

Where buildings are designed with expansion joints subdividing the structure into dynamically

independent units, all the lift machinery including the landing entrances and the well of the lift shall be

located on the same side of an expansion joint (see EN 81-20:2014, 0.4.2).
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SIST EN 81-77:2019
EN 81-77:2018 (E)
5.4 Car
5.4.1 Mass of the car for lift design calculations

For lift design calculations, the forces generated by the design acceleration (a ) shall be calculated taking

into account:

— for passenger lifts, the mass of the car plus 40 % of the rated load evenly distributed;

— for goods passenger lifts, the mass of the car plus 80 % of the rated load evenly distributed.

5.4.2 Car retaining devices

For lifts in lift categories 2 and 3, the car frame shall be provided with upper and lower retaining devices

able to hold the car frame on its guide rails.

The retaining devices shall be placed in such a way to distribute loads in a similar way as the guide shoes.

The retaining devices shall either be integrated or mounted close to the fixing of the guide shoes.

When the car is centre located between the guide rails, the clearances d , d and d (Figure 1 a)) between

1 2 3

the retaining device and the guide rail shall not exceed 5 mm and the dimensions chosen shall not cause

accidental tripping of the safety gear during an earthquake.

The depth of the retaining device (z ) shall be limited to avoid collision with guide rail attachments or

other fixed devices, but long enough to guarantee a minimum overlapping length between retaining

devices and the guide rail blade during an earthquake. The required depth of the retaining devices is also

correlated with the type of guide rail through the allowable deflection of the guide rail (see 5.8.2).

During an earthquake, the minimum overlapping length (z ) between retaining devices and the guide rail

blade shall be at least 5 mm (Figure 1 b)).

The car structure and retaining devices shall withstand the loads and forces imposed on them including

forces generated by the design acceleration (a ), without permanent deformation.
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SIST EN 81-77:2019
EN 81-77:2018 (E)

a) Nominal position and clearance of retaining device b) Minimum required overlapping length of retaining

device during earthquake
Key
d1 clearances between the retaining device and the guide rail
d2 clearances between the retaining device and the guide rail
d clearances between the retaining device and the guide rail
x guide rail x-axis
y guide rail y-axis
z depth of the retaining device
z blade height
z3 overlapping length of retaining device during earthquake (≥5 mm)
Figure 1 — Retaining device
5.4.3 Car door locking devices

To prevent the opening of car doors, for lifts in Seismic lift category 2 and 3, the car doors shall be

provided with a car door locking device which shall be designed and operate as described in

EN 81-20:2014, 5.3.9.2.
5.5 Counterweight or balancing weight

The counterweight or balancing weight shall be provided with upper and lower retaining devices able to

hold the frame in between its guide rails.

The retaining devices shall be placed in such a way to distribute loads in a similar way as the guide shoes.

The retaining devices shall either be integrated or mounted close to the fixing of the guide shoes.

The clearances d , d and d (Figure 1 a)) between the retaining devices and the guide rails shall not

1 2 3

exceed 5 mm. When a safety gear is present, the dimensions chosen for the clearances d , d and d shall

1 2 3
not cause accidental tripping of the safety gear.
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SIST EN 81-77:2019
EN 81-77:2018 (E)

During an earthquake, the minimum overlapping length (z ) between retaining devices and the guide rail

blade side shall be not less than 5 mm (Figure 1 b)).

The counterweight or balancing weight structure and retaining devices shall withstand the loads and

forces imposed on them including forces generated by the design acceleration (a ), without permanent

deformation.

The strength of the retaining devices and the counterweight frame or balancing weight frame shall be

calculated taking into account the vertical mass distribution of the assembly of the counterweight frame

or balancing weight including filler weights.

If the counterweight or the balancing weight incorporates filler weights, necessary measures shall be

taken to prevent their movement outside the frame considering the design acceleration value.

5.6 Suspension and compensation
5.6.1 Protection for traction sheaves, pulleys and sprockets

The devices for preventing the ropes from leaving the grooves of traction sheaves and pulleys shall

include one retainer within 15° of the points where the ropes enter and leave the pulleys and at least one

intermediate retainer every 90° of the angle of wrap. The strength and stiffness of the retainers and their

distance to the traction sheaves and pulleys compared to the diameter of the ropes shall be such that they

are effective.

The devices for preventing the chains from leaving the sprockets shall include one retainer within 15° of

the points where the chains enter and leave the sprockets.
5.6.2 Compensation means

Compensation means provided according to EN 81-20:2014, 5.5.6 shall be guided in the pit in order to

limit them from swaying and reaching snag points.
5.7 Precaution against environmental damage

Hydraulic lifts shall be provided with a rupture valve. The rupture valve shall comply with the

requirements of EN 81-20:2014, 5.6.3.
5.8 Guide rail system
5.8.1 General

The guide rails, their joints and attachments shall comply with the requirements of EN 81-20:2014, 5.7

and they shall also withstand the loads and forces generated by the design acceleration (a ).

Where retaining devices are provided, car and counterweight or balancing weight retaining devices shall

be used as frame supporting points in the guide rail verification.
NOTE Annex D describes an example method for selecting guide rails.
5.8.2 Permissible stresses and deflections during seismic event

5.8.2.1 Where retaining devices are not provided, the maximum permissible deflections of the car

guide rail system shall comply with the requirements of EN 81-20:2014, 5
...

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