EN 50374:2004

SLOVENSKI SIST EN 50374:2004
STANDARD
september 2004
Vozički za delo na nadzemnih vodih
Conductor cars
ICS 43.120 Referenčna številka
©  Standard je založil in izdal Slovenski inštitut za standardizacijo. Razmnoževanje ali kopiranje celote ali delov tega dokumenta ni dovoljeno

EUROPEAN STANDARD EN 50374
NORME EUROPÉENNE
EUROPÄISCHE NORM March 2004
ICS 43.120
English version
Conductor cars
Nacelles suspendues Leitungsfahrzeuge

This European Standard was approved by CENELEC on 2004-02-01. 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, Cyprus, Czech
Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden,
Switzerland and United Kingdom.

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

© 2004 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.

Ref. No. EN 50374:2004 E
Contents
Page
Foreword . 3
1 Scope . 4
2 Normative references . 4
3 Definitions . 5
4 Requirements . 5
4.1 Mechanical requirements . 5
4.2 Dielectric requirements . 9
5 Tests . 9
5.1 Proof of design. 9
5.2 Tests for personnel protection . 10
5.3 Test set-up. 10
5.4 Floor plate and travelling axles . 10
5.5 Protection against fall. 10
5.6 Brakes and locking devices . 10
5.7 Manual handling test . 11
5.8 Mounting attachments for full body harnesses . 11
5.9 Mounting attachments for traction ropes. 11
5.10 Mounting attachments for pulling up / removing . 11
5.11 Drives. 11
5.12 Operating devices . 11
5.13 Dielectric requirements . 11

- 3 - EN 50374:2004
Foreword
This European Standard was prepared by CENELEC BTWG 93-1, Conductors cars. The text of the draft
was submitted to formal vote and was approved by CENELEC as EN 50374 on 2004-02-01.
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) 2005-02-01

- latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2007-02-01

__________
1 Scope
This European Standard applies to conductor cars which are used for driving (travelling) on conductors,
shield wires or shield wires with integrated communication systems of overhead transmission lines.
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 292-2 Safety of machinery – Basic concepts, general principles for design
Part 2: Technical principles (ISO 12100-2)
EN 354 Personal protective equipment against falls from a height - Lanyards
EN 1011-1 Welding – recommendations for welding of metallic materials
Part 1: General guidance for arc welding
EN 1011-2 Welding – Recommendations for welding of metallic materials
Part 2: Arc welding of ferritic steels
EN 1011-3 Welding – Recommendations for welding of metallic materials
Part 3: Welding of stainless steels
EN 1011-4 Welding – Recommendations for welding of metallic materials
Part 4: Arc welding of aluminium and aluminium alloys
EN 1050 Safety of machinery - Principles of risk assessment (ISO 14121)
EN 1708-1 Welding – Basic weld joint details in steel - Part 1: Pressurised components
EN 1712 Non-destructive examination of welds - Ultrasonic examination of welded joints -
Acceptance levels
EN 30042 Arc-welded joints in aluminium and its weldable alloys – guidance on quality levels for
imperfections
EN 60204-1 Safety of machinery - Electrical equipment of machines
Part 1: General requirements (IEC 60204-1)
Conductor cars are covered by the Directive 98/37/EC of the European Parliament and the Council of
22 June 1998 on the approximation of the laws of the Member States relating to machinery. In the case of
conductor cars which are also used for lifting persons, the cars are devices covered by Annex IV of the
Directive.
Every manufacturer or his authorised representative established in the Community shall prove by a
conformity assessment procedure, that his conductor car complies with the requirements of the Directive.
Where this standard covers one or more of the essential safety requirements of the Directive, conductor
cars constructed in accordance with this standard shall be presumed to comply with the relevant essential
requirements.
- 5 - EN 50374:2004
3 Definitions
3.1
conductor cars
conductor cars covered by this standard are devices designed to be used as moveable workplaces on
overhead lines suspended by conductors or shield wires and which are moved manually, by pulling ropes
or built-in-traction.
In addition conductor cars may be designed to incorporate the raising of persons to the work position
3.2
brake
the brake is used for slowing down the conductor car to a standstill
3.3
locking device
the locking device is used for fixing the conductor car at a position on the conductor or shield wire
3.4
conductors (IEC 466-01-15)
a wire or combination of wires not insulated from one another, suitable for carrying an electric current.
The conductors are strung between two supports of overhead lines. They may be arranged as a single
conductor only or as a conductor bundle
3.5 Tests
3.5.1
type test (IEC 151-16-16)
conformity test made on one or more items representative of the production
3.5.2
routine test (IEC 151-16-17)
a periodical test defined by the manufacturer to which each individual device is subjected after
manufacture by the user to ascertain that it complies with certain criteria
3.6
permissible load
the permissible load is the maximum load defined by the designer with which the conductor car may be
loaded. The permissible load does not include the weight of the car
4 Requirements
4.1 Mechanical requirements
If conductor cars are designed to raise or lower persons a suitable safety factor shall be assigned, this is
usually double.
4.1.1 Frame
Frameparts which are relevant for safety shall have a calculated safety factor of at least three times the
stresses which may occur during the most unfavourable using condition with permissible load.
All materials have unique physical properties and will behave in different ways depending on the
conditions to which they are exposed. Therefore consideration should be given to raising of the safety
factor for special materials.
In case of emergency, i. e. if conductor car wheels inadvertently become detached from conductor, the
safety factor may be different than under normal using conditions.
The welding shall be carried out regarding the following European Standards e. g. EN 1011-1, EN 1011-2,
EN 1011-3 and EN 1011-4.
The welding shall at least meet the evaluation category BS-AL in accordance with EN 30042, Arc-welded
joints in aluminium and its weldable alloys - Guidance on quality levels for imperfections.
Other materials may be used if they fulfil the above mentioned requirements.
4.1.2 Chassis
The chassis must be equipped with a device which protects the car from unintended tilting or falling under
all operating and emergency conditions.
Conductor cars with built-in-traction shall be designed for a maximum speed of 6 km/h.
4.1.3 Brakes and locking device
4.1.3.1 Conductor cars shall be equipped with a brake and two locking devices independent from each
other. The brake can also work as a locking device. The brake and the locking device shall be rated in
accordance with 5.6.
4.1.3.2 The locking device shall fasten the conductor car directly to the conductor under all conditions.
In case of failure of the brake the locking device shall take over the function of the brake.
Locking devices of conductor cars shall affect at least two axles independent from each other.
4.1.3.3 For horizontally arranged conductors the brake shall have an effect on both conductors equally.
4.1.3.4 The locking devices shall be designed and arranged in such a way that their effect on at least
one axle is always ensured, especially during the overtravelling of suspension sets and spacers.
4.1.3.5 Brakes and locking devices shall be designed such that there is no damage to the conductors
under normal operating conditions.
4.1.4 Personnel protection
The conductor car shall be designed to allow rescue of an incapacitate operator.
The conductor car shall be designed to facilitate protection against the fall of persons.
In the case of conductor cars without flank protection in which the operator is sitting, there shall be a
device to secure the operator to the seat.
In the case of conductor cars in which the operator is standing, the conductor cars shall be equipped with
fall protection. The fall protection shall consist of
– a spar at a height of (1,00 ± 0,01) m,
– other design elements which ensure that persons shall not fall through and
– a border with a height of (0,1 ± 0,01) m at the floor.

- 7 - EN 50374:2004
In the case of conductor cars which are used on bundle conductors where the operator is positioned
between the bundle, subconductors may replace the function of the upper flank protections.
In the case of conductor cars which are used on bundle conductors and the operator is positioned outside
the bundle, chains or other elements may replace the function of the upper flank protections.
4.1.5 Operator environment
The conductor car shall be designed such that there are no sharp edges.
4.1.6 Car floor
The floor shall be slip resistant.
4.1.7 Mounting attachments
Conductor cars shall be provided with clearly marked mounting attachments for
– transporting (shifting to conductors or trailer, etc.),
– external traction (with pulling rope, etc.),
– equipotential bond,
– personal protective equipment against falls from a height.
If it is not requested by the customer, the conductor car may be constructed without a mounting
attachment for personal protective equipment. An alternative attachment for personal protective
equipment may be directly to the conductors.
4.1.8 Operating devices
Operating devices must be designed and arranged in such a way, that they can be reached and operated
easily without confusion. They shall be protected against unintentional operation and they shall be marked
durably.
4.1.9 Drives
Drives comprising of gears, chains and cone belts shall be completely covered.
Conductor car wheels shall be designed such that there are no risks to the operators hands. Conductor
cars shall be designed such that there is no damage to the conductors under normal operating conditions.
4.1.10 Cables and hydraulic hoses
Cables and hoses shall be protected against mechanical damage.
4.1.11 Break down of built-in-traction
Conductor cars with built-in-traction shall be able to be moved manually or by means of a pulling rope, if
the built-in-traction fails.
4.1.12 Identification plate
Conductor cars shall have a identification plate wi
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