SIST EN 50528:2010
Insulating ladders for use on or near low voltage electrical installations
Insulating ladders for use on or near low voltage electrical installations
This European Standard is applicable to portable ladders made of non conductive stiles, including accessories (cradle, adjustable foot, adjustable ladder stabilizer, foot leveller device, etc.) used to work on or near electrical systems and installations in the low voltage range (below 1 000 V a.c./1 500 V d.c.). These ladders are used, to provide temporary access, generally on overhead line structures and to undertake electrical operations. They shall be used by one person only These ladders are not intended to be put in direct contact with energized parts nevertheless they provide sufficient insulation level to protect against inadvertent contact with low voltage live parts. The requirements and tests described in this European Standard shall be considered in addition to the EN 131 series.
Isolierende Leiter für arbeiten an oder in der Nähe elektrischer Anlagen
Diese Europäische Norm gilt für tragbare Leitern mit nicht leitfähigen Holmen und Zubehör (Abstandshalter, verstellbare Füße, verstellbare Leiterstabilisierung, Boden-Ausgleichsvorrichtung usw.), die für Arbeiten an oder in der Nähe elektrischer Leitungen und Anlagen im Niederspannungsbereich (unter 1 000 V Wechsel-spannung/1 500 V Gleichspannung) verwendet werden. Diese Leitern sind im Allgemeinen für den zeitweisen Zugang zu Freileitungsmasten vorgesehen, um elektrische Betätigungen durchzuführen. Sie dürfen nur von einer Person benutzt werden. Diese Leitern sind nicht für den direkten Kontakt mit unter Spannung stehenden Teilen vorgesehen; trotzdem bieten sie ausreichenden Isolationspegel zum Schutz bei unbeabsichtigtem Berühren von unter Nieder-spannung stehenden Teilen. Die Anforderungen und vorgeschriebenen Prüfungen in dieser Norm gelten zusätzlich zur Normreihe EN 131. ANMERKUNG Diese Europäische Norm gilt nicht für Leitern zur Anwendung über 1 000 V Wechselspannung/1 500 V Gleichspannung. Für diese Produkte gilt eine eigene Norm (EN 61478).
Echelles isolantes pour utilisation sur ou à proximité des installations électriques
La présente Norme Européenne est applicable aux échelles portables constitué de montants non conducteurs et comprenant des accessoires (berceau d’appui poteau, pieds ajustables, stabilisateurs d’échelle ajustables, système de pieds compensateurs de niveau, etc.) utilisées pour travailler sur ou à proximité des ouvrages ou installations électriques basse tension (inférieure à 1 000 V a.c. ou 1 500 V d.c.). Ces échelles sont utilisées pour fournir un accès temporaire, généralement à une structure aérienne et pour entreprendre des opérations électriques. Elles doivent être utilisées par une seule personne à la fois. Ces échelles ne sont pas prévues pour être mises au contact direct avec des parties sous tension néanmoins elles fournissent un niveau d’isolation suffisant pour se protéger d’un contact par inadvertance avec des parties actives basse tension. Les exigences et les essais décrits dans cette Norme Européenne doivent être considérés comme complémentaires à la série EN 131. NOTE Cette Norme Européenne ne couvre pas les échelles pour des applications à des tensions supérieures à 1 000 V a.c. ou 1 500 V d.c. Ces produits sont couverts séparément par une norme particulière (EN 61478).
Izolirne lestve za uporabo na nizkonapetostnih električnih inštalacijah ali v njihovi bližini
Ta evropski standard velja za prenosne lestve, narejene iz neprevodnih trakov iz lesa, vključno z dodatki (podstavek, prilagodljive noge, prilagodljiv stabilizator lestve, naprava za izravnavo nog itd.), ki se uporabljajo za delo na električnih sistemih in inštalacijah ali v njihovi bližini v razponu nizke napetosti (pod 1000 v izmeničnega in 500 V enosmernega toka). Te lestve se uporabljajo za zagotavljanje začasnega dostopa, običajno na nadzemnih strukturah vodov in za opravljanje električnih del. Uporablja jih lahko le ena oseba. Te lestve niso namenjene temu, da se jih postavi v neposredni stik z deli, priklopljenimi na vir električne energije, vendar zagotavljanja zadostno raven izolacije za varovanje pred nenamernim stikom z deli pod nizko napetostjo. Zahteve in preskusi, opisani v tem evropskem standardu, se upoštevajo poleg serije EN 131.
General Information
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN 50528:2010
01-december-2010
,]ROLUQHOHVWYH]DXSRUDERQDQL]NRQDSHWRVWQLKHOHNWULþQLKLQãWDODFLMDKDOLYQMLKRYL
EOLåLQL
Insulating ladders for use on or near low voltage electrical installations
Isolierende Leiter für arbeiten an oder in der Nähe elektrischer Anlagen
Echelles isolantes pour utilisation sur ou à proximité des installations électriques
Ta slovenski standard je istoveten z: EN 50528:2010
ICS:
13.260 9DUVWYRSUHGHOHNWULþQLP Protection against electric
XGDURP'HORSRGQDSHWRVWMR shock. Live working
97.145 Lestve Ladders
SIST EN 50528:2010 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST EN 50528:2010
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SIST EN 50528:2010
EUROPEAN STANDARD
EN 50528
NORME EUROPÉENNE
May 2010
EUROPÄISCHE NORM
ICS 97.145;13.260
English version
Insulating ladders for use on or near low voltage electrical installations
Echelles isolantes pour utilisation Isolierende Leitern für Arbeiten
sur ou à proximité des installations an oder in der Nähe
électriques basse tension von Niederspannungsanlagen
This European Standard was approved by CENELEC on 2010-05-01. CENELEC 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 Central Secretariat or to any CENELEC 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 CENELEC member into its own language and notified
to the Central Secretariat has the same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus,
the Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy,
Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia,
Spain, Sweden, Switzerland and the United Kingdom.
CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
Management Centre: Avenue Marnix 17, B - 1000 Brussels
© 2010 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 50528:2010 E
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SIST EN 50528:2010
EN 50528:2010 – 2 –
Foreword
This European Standard was prepared by the Technical Committee CENELEC TC 78, Equipment and
tools for live working. It was submitted to the formal vote and was approved by CENELEC as EN 50528
on 2010-05-01.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN and CENELEC shall not be held responsible for identifying any or all such patent
rights.
The following dates were fixed:
– latest date by which the EN has to be implemented
at national level by publication of an identical
national standard or by endorsement (dop) 2011-05-01
– latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2013-05-01
__________
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SIST EN 50528:2010
– 3 – EN 50528:2010
Contents
Introduction . 4
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 5
4 Requirements . 7
4.1 Safety requirements . 7
4.2 Functional requirements . 7
4.3 Electrical requirements . 9
4.4 Mechanical requirements . 9
4.5 Markings . 9
4.6 Instruction for use . 9
5 Verification and testing .10
5.1 General .10
5.2 Design, dimensions, construction .11
5.3 Mechanical tests .11
5.4 Marking .12
5.5 Instruction for use .12
5.6 Electrical tests .12
6 Conformity evaluation .13
7 Modifications .13
Annex A (normative) Classification of defects and associated requirements and tests .18
Annex B (informative) In-service recommendations .19
B.1 General .19
B.2 Use and storage .19
B.3 Inspection before use .19
B.4 Maintenance .19
Annex C (normative) General test procedure .21
Bibliography .22
Figures
Figure 1 – Cradle sketch plan (given as an example) . 14
Figure 2 – Test on stiles – Configuration and type of electrodes used . 15
Figure 3 – Examples of foot leveller device, adjustable feet and adjustable ladder stabilizer . 16
Figure 4 – Example of individual standing platform . 17
Tables
Table A.1 – Classification of defects and associated requirements and tests . 18
Table C.1 – Sequential order for performing tests . 21
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SIST EN 50528:2010
EN 50528:2010 – 4 –
Introduction
Ladders covered by this European Standard are used to work on low voltage live parts, such as
to perform connector fittings, repair on pole, switching actions. They are also used to carry out
operations prior to dead working, as in the case of voltage detection, earthing and short-
circuiting, etc.
In all these cases the ladders has two main functions, to reach the part of the installation that
needs to be operated on and to protect the worker from risk of electrical injury, by providing the
insulation level and maintaining the safety distance between the worker and the live or
potentially live installation.
Taking the local risk assessment into account, additional protection (either personal or collective)
can be furthermore considered.
This European Standard contributes to the safety of the users provided they are trained to the
operations envisaged.
Additional requirements when using the ladders should be considered to fulfil the European
Directives and national regulations.
The ladder is used in accordance with EN 50110 series.
This European Standard has been prepared in accordance with the requirements of EN 61477.
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SIST EN 50528:2010
– 5 – EN 50528:2010
1 Scope
This European Standard is applicable to portable ladders made of non conductive stiles,
including accessories (cradle, adjustable foot, adjustable ladder stabilizer, foot leveller device,
etc.) used to work on or near electrical systems and installations in the low voltage range (below
1 000 V a.c./1 500 V d.c.).
These ladders are used, to provide temporary access, generally on overhead line structures and
to undertake electrical operations. They shall be used by one person only
These ladders are not intended to be put in direct contact with energized parts nevertheless they
provide sufficient insulation level to protect against inadvertent contact with low voltage live
parts.
The requirements and tests described in this European Standard shall be considered in addition
to the EN 131 series.
NOTE This European Standard does not cover ladders for applications upper than 1 000 V a.c/1 500 V d.c. These products are
separately covered by a specific standard (EN 61478).
2 Normative references
The following referenced documents are indispensable for the application 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 131-1:2007, Ladders – Part 1: Terms, types, functional sizes
EN 131-2:1993, Ladders – Part 2: Requirements, testing, marking
EN 131-3:2007, Ladders – Part 3: User instructions
EN 131-4:2007, Ladders – Part 4: Single or multiple hinge-joint ladders
EN 60068-1:1994, Environmental testing – Part 1: General and guidance (IEC 60068-1:1988 +
corrigendum Oct. 1988 + A1:1992)
EN 61318:2008, Live working – Conformity assessment applicable to tools, devices and equipment
(IEC 61318:2007)
EN 61477:2009, Live working – Minimum requirements for the utilization of tools, devices and equipment
(IEC 61477:2009 + corrigendum Apr. 2009)
EN 61478:2001 + A1:2003, Live working – Ladders of insulating material (IEC 61478:2001 + A1:2003,
mod.)
IEC 60417, Graphical symbols for use on equipment
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
NOTE 1 Further information on terminology is given in EN 131-1.
NOTE 2 The term “ladder” is used in this document for “ladders for use on or near low voltage installations”.
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SIST EN 50528:2010
EN 50528:2010 – 6 –
3.1
adjustable foot
adjustable device with anti-skit shoes inserted or secured on the base of the stiles in order to provide a
firmly grip to the ground
NOTE Function can be obtained by mean of rotatable, traversable type or other appropriate constructions.
3.2
adjustable ladder stabilizer
system of support legs fitted to the ladder to reinforce stability when working
3.3
cradle
device designed to rest on the pole on which it is positioned
3.4
fixing straps
device designed to secure the ladder to the structure (pole)
3.5
foot leveller device
device inserted or secured at the base of the stiles that provides stability to the ladder and/or balances
automatically the ground level differences
3.6
individual standing platform
standing surface allowing to stay (and operate) at the working place
3.7
insulated material
conductive material partly or totally coated with insulating material
3.8
non conductive material
material either insulating or insulated
3.9
rung wear devices
devices that reduce the friction and ease the operation of extending ladders by limiting the rung/stile
contact
3.10
stile closures
bottom and upper-ends caps to close the stiles
3.11
sliding guides
sleeves that help to slide sections of extending ladders and avoid rim damage to the ladder stiles
3.12
sliding wheels
roller devices that help to erect extending ladders and to protect walls from dents and scratches
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SIST EN 50528:2010
– 7 – EN 50528:2010
4 Requirements
4.1 Safety requirements
The ladders shall be designed and manufactured to contribute to the safety of the users provided
they are used in accordance with the manufacturer’s instruction for use.
Constructive arrangements shall be such as to prevent any misuse (i.e. ladders set at reverse
side). Construction design shall be such as to minimise the penetration of water and dirt.
The stiles shall be of electrically non conductive material.
The rungs (whatever their length) may be either in conductive or non conductive material.
All items that could reach inadvertently live conductors and having overall dimension exceeding
300 mm shall not impair the electrical properties of the ladder.
Among them are: cradle, individual standing platform.
Any bare conductive parts (see 4.3) of these items shall not exceed 300 mm in length.
This requirement excludes the following items:
• foot leveller device;
• adjustable ladder stabilizer;
• locking device;
• rope(s).
The rungs shall have a non-slip surface. The shape of the rungs shall be designed to ensure a
firm grip for gloved hands and also a support that ensures comfort for the worker wearing shoes
or boots.
4.2 Functional requirements
4.2.1 General
All metallic elements shall be protected against corrosion.
The complete ladder shall be as light as practicable.
4.2.2 Ropes (if any)
Ropes for extending ladders shall be made of synthetic fibre. The design being polystrands
(approximate diameter 10 mm)
Ropes shall have a minimum breaking strength of 1 250 daN. Their length shall be such that it
could be always possible to secure their free extremity at the lower rung of the base section
whatever the allowed extension of the ladder.
4.2.3 Stile closures
The stile closures shall be made of soft material and shall be antiskid. The stile closures at the
base shall be such designed to provide a satisfactory adherence to the ground.
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SIST EN 50528:2010
EN 50528:2010 – 8 –
They shall be easily dismountable for replacement.
4.2.4 Pulleys (if any)
Their sheaves shall have a groove wider than 10 mm.
4.2.5 Rung wear devices
The rung wear devices shall be such designed they avoid any premature wearing effect of the
rungs and stiles.
4.2.6 Cradle
The ladder shall be equipped with a cradle (an example is shown in Figure 1) avoiding that the
upper rung rests on the structure. Wearable parts shall be easily dismountable for replacement
and made of soft slip resistant material.
Cradle shall withstand stresses without breaking.
4.2.7 Foot leveller device
They shall be adjustable in height on both sides of the ladder.
They shall be such designed to be safely attached at the base of the ladder without causing
damages to the stiles.
Their shoes shall offer either soft antiskid or ice pick plates.
They shall be manually or automatically locked in place and withstand the weight of the whole
equipment.
Example of design is given in Figure 3 a) while Figure 3 b) shows an example of leveller device
equipped with adjustable feet.
4.2.8 Adjustable ladder stabilizer (if any)
They shall provide extra stability by extending the base of the ladder.
4.2.9 Individual standing platform (if any)
The total overall length of the standing platform shall be in the range of 0,4 m and 1,5 m; its
width shall be within 0,4 m and 1 m.
The platform shall be fixed at residence to the ladder (an example is shown in Figure 4). The
access side shall be equipped with mobile and interdependent rigid top guard rails and
intermediate rails. The platform shall be equipped with toe
...
SLOVENSKI STANDARD
oSIST prEN 50528:2009
01-januar-2009
,]ROLUQHOHVWYH]DXSRUDERQDQL]NRQDSHWRVWQLKHOHNWULþQLKLQãWDODFLMDKDOLYQMLKRYL
EOLåLQL
Insulating ladders for use on or near low voltage electrical installations
Isolierende Leiter für arbeiten an oder in der Nähe elektrischer Anlagen
Echelles isolantes pour utilisation sur ou à proximité des installations électriques
Ta slovenski standard je istoveten z: prEN 50528:2008
ICS:
13.260 9DUVWYRSUHGHOHNWULþQLP Protection against electric
XGDURP'HORSRGQDSHWRVWMR shock. Live working
97.145 Lestve Ladders
oSIST prEN 50528:2009 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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oSIST prEN 50528:2009
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oSIST prEN 50528:2009
DRAFT
EUROPEAN STANDARD
prEN 50528
NORME EUROPÉENNE
October 2008
EUROPÄISCHE NORM
ICS 97.145;13.260
English version
Insulating ladders for use on or near low voltage electrical installations
Echelles isolantes pour utilisation sur ou à Isolierende Leiter für arbeiten an oder in
proximité des installations électriques der Nähe elektrischer Anlagen
This draft European Standard is submitted to CENELEC members for CENELEC enquiry.
Deadline for CENELEC: 2009-03-13.
It has been drawn up by CLC/TC 78.
If this draft becomes a European Standard, CENELEC 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.
This draft European Standard was established by CENELEC in three official versions (English, French, German).
A version in any other language made by translation under the responsibility of a CENELEC member into its own
language and notified to the Central Secretariat has the same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Cyprus, the
Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain,
Sweden, Switzerland and the United Kingdom.
Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to
change without notice and shall not be referred to as a European Standard.
CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
Central Secretariat: rue de Stassart 35, B - 1050 Brussels
© 2008 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Project: 21458 Ref. No. prEN 50528:2008 E
Draft for Enquiry
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oSIST prEN 50528:2009
prEN 50528:2008 - 2 –
1 Foreword
2 This draft European Standard was prepared by the Technical Committee CENELEC TC 78,
3 Equipment and tools for live working. It is submitted to the CENELEC enquiry.
4 _____________
Draft for Enquiry
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oSIST prEN 50528:2009
- 3 – prEN 50528:2008
5 Contents
6 Page
7 1 Scope . 6
8 2 Normative references . 6
9 3 Def i n i ti o n s . 7
10 4 Requirements. 8
11 4.1 Safety requirements . 8
12 4.2 Functional requirements . 8
13 4.2.1 Ge ner a l . 8
14 4.2.2 Ropes (if any) . 8
15 4.2.3 Stile closures . 8
16 4.2.4 Pulleys (if any) . 9
17 4.2.5 Rung wear devices . 9
18 4.2.6 Cradle . 9
19 4.2.7 Foot leveller device (if any) . 9
20 4.2.8 Adjustable ladder stabilizer (if any) . 9
21 4.2.9 Individual standing platform (if any) . 9
22 4.3 Electrical requirements . 10
23 4.3.1 Electrically non conductive parts . 10
24 4.4 Mechanical requirements . 10
25 4.4.1 Design . 10
26 4.4.2 Dimensions, construction . 10
27 4.5 Markings . 10
28 4.6 Instruction for use . 10
29 5 Verification and testing. 11
30 5.1 General . 11
31 5.2 Design, dimensions, construction . 11
32 5.3 Mechanical tests . 11
33 5.3.1 Type test . 11
34 5.3.2 Alternative means for ladders having completed the production phase . 12
35 5.4 Marking . 12
36 5.4.1 Presence of marking . 12
37 5.4.2 Durability of marking . 12
38 5.5 Instruction for use . 12
39 5.6 Electrical tests . 13
40 5.6.1 Type test . 13
41 5.6.2 Alternative means for ladders having completed the production phase . 13
42 6 Conformity evaluation . 14
43 7 Mo d i f i c a t i o n s . 14
Draft for Enquiry
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oSIST prEN 50528:2009
prEN 50528:2008 - 4 –
44 Annexe A (informative) Acceptance test . 18
45 Annexe B (normative) Classification of defects and associated requirements and tests . 19
46 Annexe C (informative) In-service recommendations . 20
47 C.1 General . 20
48 C.2 Use and storage . 20
49 C.3 Inspection before use . 20
50 C.4 Maintenance . 20
51 C.4.1 Regular maintenance . 20
52 C.4.2 Periodic maintenance . 21
53 Annexe D (normative) General test procedure . 22
54 Figures
55 Figure 1 - Cradle sketch plan (given as an example) . 15
56 Figure 2 –Test on stiles - Configuration and type of electrodes used . 16
57 Figure 3 – Examples of foot leveller device, adjustable feet and adjustable ladder stabilizer 17
58
59 Tables
60 Table B.1 – Classification of defects and associated requirements and tests . 19
61 Tableau D.1 – Sequential order for performing tests . 22
62
63
Draft for Enquiry
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oSIST prEN 50528:2009
- 5 – prEN 50528:2008
64 Introduction
65 Ladders covered by this European Standard are used to work on low voltage live parts, such as to
66 perform connectors fittings, repair on pole, switching actions. They are also used to carry out
67 operations prior to dead working, as in the case of voltage detection, earthing and short-circuiting,
68 etc.
69 In all these cases the ladders has two main functions, to reach the part of the installation that needs
70 to be operated on and to protect the worker from risk of electrical injury, by providing the insulation
71 level and maintaining the safety distance between the worker and the live or potentially live
72 installation.
73 Taking the local risk assessment into account, additional protection (either personal or collective)
74 can be furthermore considered.
75 This standard contributes to the safety of the users provided they are trained to the operations
76 envisaged.
77 Additional requirements when using the ladders should be considered to fulfil the European
78 Directives and national regulations.
79 The ladder is used in accordance with EN 50110 series.
80 This European Standard has been prepared in accordance with the requirements of EN 61477.
Draft for Enquiry
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oSIST prEN 50528:2009
prEN 50528:2008 - 6 –
81
82 1 Scope
83 The present European Standard is applicable to portable ladders made of non conductive stiles,
84 including accessories (cradle, adjustable foot, adjustable ladder stabilizer, foot leveller device, etc.)
85 used to work on or near electrical systems and installations in the low voltage range (below
86 1 000 V a.c/1 500 V d.c.).
87 These ladders are used, to provide temporary access, generally on overhead line structures and to
88 undertake electrical operations. They shall be used by one person only per ascending leg of ladder.
89 When ladders are used where the voltage is greater than 1 000 V a.c/1 500 V d.c., EN 61478
90 applies.
91 These ladders are not intended to be put in direct contact with energized parts nevertheless they
92 provide sufficient insulation level to protect against inadvertent contact with low voltage live parts.
93 The requirements and tests described in this standard shall be considered in addition to the EN 131
94 series.
95 NOTE The present European Standard does not cover ladders for applications upper than 1 000 V a.c/1 500 V d.c.
96 These products are separately covered by a specific standard (EN 61478).
97 2 Normative references
98 The following referenced documents are indispensable for the application of this document. For
99 dated references, only the edition cited applies. For undated references, the latest edition of the
100 referenced document (including any amendments) applies.
101 EN 131-1:2007, Ladders – Part 1: Terms, types, functional sizes
102 EN 131-2:1993, Ladders – Part 2: Requirements, testing, marking
103 EN 131-3:2007, Ladders – Part 3 User instructions
104 EN 131-4:2007, Ladders – Part 4 Single or multiple hinge-joint ladders
105 EN 60068-1:1994, Environmental testing – Part 1: General and guidance (IEC 60068-1:1988 +
106 corrigendum Oct. 1988 + A1:1992)
107 EN 60743:2001, Live working – Terminology for tools, equipment and devices (IEC 60743:2001)
108 EN 61477:2002, Live working – Minimum requirements for the utilization of tools, devices and
109 equipment (IEC 61477:2001)
110 EN 61478:2001, Live working – Ladders of insulating material (IEC 61478:2001)
111 EN 61478:2001/A1:2003, Live working – Ladders of insulating material (IEC 61478:2001/A1:2003,
112 mod.)
113 EN 61318:2008, Live working – Conformity assessment applicable to tools, devices and equipment
114 (IEC 61318:2007)
Draft for Enquiry
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oSIST prEN 50528:2009
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115 3 Definitions
116 For the purposes of this document the following definitions apply.
117
118 NOTE 1 Further information on terminology is given in EN 131-1.
119 NOTE 2 The term ladder is used in this document for “ladders for use on or near low voltage installations”.
120 3.1
121 non conductive material
122 material either insulating or insulated
123 3.2
124 cradle
125 device designed to rest on the pole on which it is positioned
126 3.3
127 fixing straps
128 device designed to secure the ladder to the structure (pole)
129 3.4
130 adjustable foot
131 rotating shoe inserted or secured on the base of the stiles in order to adjust a level difference and
132 firmly grip to the ground
133 3.5
134 adjustable ladder stabilizer
135 system of support legs fitted to the ladder to reinforce stability when working
136 3.6
137 foot leveller device
138 device inserted or secured at the base of the stiles that provides stability to the ladder and/or
139 balances automatically the ground level differences
140 3.7
141 stile closures
142 bottom and upper-ends caps to close the stiles
143 3.8
144 rung wear devices
145 devices that reduce the friction and ease the operation of extending ladders by limiting the
146 rung/stile contact
147 3.9
148 sliding guides
149 sleeves that help to slide sections of extending ladders and avoid rim damage to the ladder stiles
150 3.10
151 sliding wheels
152 roller devices that help to erect extending ladders and to protect walls from dents and scratches
153 3.11
154 individual standing platform
155 standing surface allowing to stay (and operate) at the working place
156 3.12
157 insulated material
158 conductive material partly or totally coated with insulating material
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159 4 Requirements
160 4.1 Safety requirements
161 The ladders shall be designed and manufactured to contribute to the safety of the users provided
162 they are used in accordance with the manufacturer’s instruction for use.
163 Constructive arrangements shall be such as to prevent any misuse (i.e. ladders set at reverse side).
164 Construction design shall be such as to minimise the penetration of water and dirt.
165 The stiles shall be of electrically non conductive material.
166 The rungs (whatever their length) may be either in conductive or non conductive material.
167 All items that could reach inadvertently live conductors and having overall dimension exceeding
168 300 mm shall not impair the electrical properties of the ladder.
169 Among they are: Cradle, Individual standing platform.
170 Any bare conductive parts (see 4.3.1) of these items shall not exceed 300 mm in length.
171 This requirement excludes the following items:
172 • foot leveller device;
173 • adjustable ladder stabilizer;
174 • locking device;
175 • rope(s).
176 The rungs shall have a non-slip surface. The shape of the rungs shall be designed to ensure a firm
177 grip for gloved hands and also a support that ensures comfort for the worker wearing shoes or
178 boots.
179 4.2 Functional requirements
180 4.2.1 General
181 All metallic elements shall be protected against corrosion.
182 The complete ladder shall be as light as practicable
183 4.2.2 Ropes (if any)
184 Ropes for extending ladders shall be made of poly-strands polyester fibre or equivalent-
185 (approximate diameter 10 mm)
186 Ropes shall have a minimum breaking strength of 1 250 daN. Their length shall be such that it could
187 be always possible to secure their free extremity at the lower rung of the base section whatever the
188 allowed extension of the ladder.
189 4.2.3 Stile closures
190 The stile closures shall be made of soft material and shall be antiskid. The stile closures at the base
191 shall be such designed to provide a satisfactory adherence to the ground.
192 In both cases they shall be easily dismountable for replacement.
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193 4.2.4 Pulleys (if any)
194 Their sheaves shall have a groove wider than 10 mm.
195 When secured on the rungs the pulleys shall be mounted at mid-span of the rungs.
196 4.2.5 Rung wear devices
197 The rung wear devices shall be such designed they avoid any premature wearing effect of the rungs
198 and stiles.
199 4.2.6 Cradle
200 The ladder shall be equipped with a cradle (an example is shown in Figure 1) avoiding that the
201 upper rung rests on the structure. Wearable parts shall be easily dismountable for replacement and
202 made of soft slip resistant material.
203 Cradle shall withstand stresses without breaking.
204 4.2.7 Foot leveller device (if any)
205 They shall provide height adjustments to either one or both sides of the ladder.
206 They shall be such designed to be safely attached at the base of the ladder without causing
207 damages to the stiles.
208 Their shoes shall offer either soft antiskid or ice pick plates.
209 They shall be manually or automatically locked in place and withstand the weight of the whole
210 equipment.
211 Example of design are given in Figure 3a while Figure 3b shows an example of leveller device
212 equipped with adjustable feet.
213 4.2.8 Adjustable ladder stabilizer (if any)
214 They shall provide extra stability by extending the base of the ladder.
215 4.2.9 Individual standing platform (if any)
216 The overall length of the platform shall not exceed 1,5 m; its width shall be within 0,4 m and 1 m.
217 The platform shall be fixed at residence to the ladder. The access side shall be equipped with
218 mobile and interdependent rigid top guard rails and intermediate rails. The platform shall be
219 equipped with toe board on the three other sides.
220 The gap defined by the vertical plans, passing one by the external edge of the plinth or floor, the
221 other by the i
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