DPN - Live Working

IEC 61472-2:2021 specifies a method for determining the electrical component of the minimum approach distances for live working, for AC systems 1 kV up to and including 72,5 kV. This document addresses system overvoltages and the working air distances between equipment and/or workers at different potentials.
The withstand voltage and minimum approach distances determined by the method described in this document can be used only if the following working conditions prevail:

   
• workers are trained for, and skilled in, working live lines or close to live conductors or equipment;

   
• the operating conditions are adjusted so that the statistical overvoltage does not exceed the value selected for the determination of the required withstand voltage;

   
• transient overvoltages are the determining overvoltages;

   
• tool insulation has no continuous film of moisture present on the surface;

   
• no lightning is observed within 10 km of the work site;

   
• allowance is made for the effect of the conducting components of tools.

Transparency on national legislation and standards to be obeyed when working
29.1. Laws and regulations
29.1.1. Zakon o varnosti in zdravju pri delu (Uradni list RS, št. 43/11)
29.1.1.1. Occupational Health and Safety Act.
29.1.1.2. Explanation of content of law or regulation ➔ void
29.1.2. Pravilnik o varstvu pri delu pred nevarnostjo električnega toka (Uradni list RS, št. 29/92, 56/99 – ZVZD
in 43/11 – ZVZD-1)
29.1.2.1. Translation of Title of national law or regulation ➔ void
29.1.2.2. Rules on industrial safety with regard to electric current hazards
29.1.3. Uredba o zagotavljanju varnosti in zdravja pri delu na začasnih in premičnih gradbiščih (Uradni list RS,
št. 83/05 in 43/11 – ZVZD-1)
29.1.3.1. Translation of Title of national law or regulation ➔ void
29.1.3.2. Decree on safety and health requirements at work on temporary and mobile construction s
29.1.4. Pravilnik o osebni varovalni opremi, ki jo delavci uporabljajo pri delu (Uradni list RS, št. 89/99, 39/05 in
43/11 – ZVZD-1)
29.1.4.1. Translation of Title of national law or regulation ➔ void
29.1.4.2. Rules on personal protective equipment used by employees
29.1.5. Pravilnik o osebni varovalni opremi (Uradni list RS, št. 29/05, 23/06, 17/11 – ZTZPUS-1 in 76/11)
29.1.5.1. Rules on personal protective equipment (endorsement of European Directive 89/656/EEC)
89/686/EGS
29.1.5.2. Explanation of content of law or regulation ➔ void
29.2. Standards
29.2.1. SIST EN 50110-1:2013
29.2.1.1. Operation of electrical installations EN 50110-1 Part 1: General requirements
29.2.1.2. Identical to EN 50110-1:2013 (implemented without modifications)
29.2.2. SIST EN 61936-1:2011
29.2.2.1. Power installations exceeding 1 kV a.c. - Part 1: Common rules
29.2.2.2. Identical to EN 61936-1:2010 (implemented without modifications)
29.2.3. SIST EN 50522:2011
29.2.3.1. Earthing of power installations exceeding 1 kV a.c.
29.2.3.2. Identical to EN 50522:2010 (implemented without modifications)
29.3. Other Documents
29.3.1. Title of the national Document ➔ void
29.3.1.1. Translation of Title of the national Document ➔ void
29.3.1.2. Explanation of content of national Document ➔ void

This document is applicable to conductive clothing, worn during live working (especially barehand
working) on AC and DC electrical installations, to provide electrical continuity between all
parts of the clothing and a reduction of electric field inside the clothing.
This document is applicable to conductive clothing assembled from a conductive garment
(jackets and trousers or coveralls forming a one-piece garment) and from conductive component
parts (gloves, hoods or helmets, shoes or boots, overshoe socks and socks) in electrical
systems with nominal voltage up to 1 000 kV AC and up to ±800 kV DC.
This document does not indicate values of protection from the effects of the electric arc,
because any value indicated would not guarantee the necessary protection from the effects of
electric arcs, or the operator would need to wear very heavy and rigid conductive clothing, which
would not allow the execution of the work in safety.
The products designed and manufactured according to this document contribute to the safety
of the users provided they are used by persons trained for the work, in accordance with the live
working methods and the instructions for use.

TAN - // IEC Corrigendum

IEC 61482-2 is applicable to protective clothing used in work where there is the risk of exposure to an electric arc hazard. This document specifies requirements and test methods applicable to materials and garments for protective clothing for electrical workers against the thermal hazards of an electric arc. Electric shock hazard is not covered by this document, which is applicable in combination with standards covering such hazards. Other effects than the thermal effects of an electric arc like noise, light emissions, pressure rise, hot oil, electric shock, the consequences of physical and mental shock or toxic influences are not covered by this document. Protection of eyes, face, head, hands and feet against electric arc hazard is not covered by this document.

This standard shall be read with EN 50186-1 "Operation of electrical installations - Part 1: General requirements" and contains national annexes which need to be used on this subject.

This document specifies test method procedures to determine the arc rating of flame resistant clothing materials and garments or assemblies of garments intended for use in clothing for workers if there is an electric arc hazard. An open arc under controlled laboratory conditions is used to determine the values of ELIM, ATPV or EBT of materials, garments or assemblies of garments. Other effects than the thermal effects of an electric arc like noise, light emissions, pressure rise, hot oil, electric shock, the consequences of physical and mental shock or toxic influences are not covered by this document. Protective clothing for work intentionally using an electric arc, e.g. arc welding, plasma torch, is not covered by this document.

This part of IEC 60050 defines terms specifically relevant to live working. It has the status of a
horizontal standard in accordance with IEC Guide 108, Guidelines for ensuring the coherency
of IEC publications – Application of horizontal standards.
The aim of this IEV part is to provide precise, brief and correct definitions of internationally
accepted concepts in the field of live working, and to name the terms by which these defined
concepts shall be known.
NOTE Complementary terms and definitions of tools, devices and equipment for live working are provided in
IEC 60743, Live working - Terminology for tools, devices and equipment.
This terminology is consistent with the terminology developed in the other specialized parts of
the IEV.
This horizontal standard is primarily intended for use by technical committees in the
preparation of standards in accordance with the principles laid down in IEC Guide 108.
One of the responsibilities of a technical committee is, wherever applicable, to make use of
horizontal standards in the preparation of its publications. The content of this horizontal
standard will not apply unless specifically referred to or included in the relevant publications.

Based on IEC corrigendum

This document is applicable to insulated, insulating and hybrid hand tools used for working
live or close to live parts at nominal voltages up to 1 000 V AC and 1 500 V DC.
The products designed and manufactured according to this document contribute to the safety
of the users provided they are used by skilled persons, in accordance with safe methods of
work and the instructions for use (where appropriate).

TC - Update of EN title; Update of reference in clause 4.4.1; Update of cross-referencing.

This European standard specify the requirements and testing for PPE footwear used as electrical insulating footwear and overboots used for working live or close to live parts on installations up to 36,000V ac.
The products designed and manufactured according to this standard contribute to the safety of the users provided they are used by skilled persons, in accordance with safe methods of work and the instructions for use.
Antistatic, shock resistant and conductive footwear are not covered by this standard.

This document is applicable to insulating aerial devices for mounting on a chassis, to be used
for live working on electrical installations at nominal voltages above 1 000V r.m.s. AC in the
range 45 Hz to 65 Hz and 1 500V DC.
The primary purpose of an aerial device is for work positioning of personnel. Other devices,
such as jibs, may be fitted in order to assist the operator in performing the work.
This document also includes requirements and tests for the parts of the chassis influencing
the performance of the insulating aerial devices to be used for live working.
When mounted on a chassis, the insulating aerial device becomes a component of a mobile
elevating work platform (MEWP). Complementary requirements for the resulting MEWP are
included in ISO 16368.
NOTE 1 In Europe, EN 280 instead of ISO 16368 is often used as reference for complementary requirements.
The products designed and manufactured according to this document contribute to the safety
of users, provided they are used by skilled persons, in accordance with safe methods of work
and the instructions for use.
NOTE 2 Any requirements that are in conflict with or are meant to be complementary to ISO 16368 are delineated
herein.
Radial boom (digger) derricks are not covered by this document.

This part of IEC 60855 is applicable to insulating foam-filled tubes and solid rods, of a circular
cross-section, made of synthetic materials with reinforced fibreglass and intended to be used in
the manufacture and construction of tools, devices and equipment for carrying out live
working on electrical systems operating at voltages above 1 kV.
Foam-filled tubes and solid rods of cross-section other than circular and/or made with material
other than synthetic materials with reinforced fibreglass are not covered by this part of
IEC 60855.

IEC corrigendum

This part of IEC 61481 is applicable to portable phase comparators of resistive type to be
used on electrical systems for voltages from 1 kV a.c. to 36 kV a.c. and frequencies of 50 Hz
and/or 60 Hz.
This standard is applicable to phase comparators of resistive type used in contact with the
bare conductive parts to be compared:
• as a complete device including its insulating element or
• as a separate device, adaptable to an insulating stick which, as a separate tool, is not
covered by this standard.
NOTE Some parts such as the contact electrode or the insulating element of a phase comparator as a complete
device may be dismantled.
Some restrictions on their use are applicable in the case of factory-assembled switchgear and
on overhead systems of electrified railways (see Annex A).
A device that is designed to provide other functions than phase comparison is a different
device and is not covered by this standard. For example a device designed to be also used as
a voltage detector is not covered by this standard (see Annex A).
Products designed and manufactured according to this standard contribute to the safety of the
users provided they are used by persons trained for the work, in accordance with the hot stick
working method and the instructions for use.
Except when otherwise specified, all the voltages defined in this standard refer to phase-tophase
voltages of three-phase systems. In other systems, the applicable phase-to-phase or
phase-to-earth (ground) voltages should be used to determine the operating voltage.

This part of IEC 61481 is applicable to portable phase comparators of capacitive type to be
used on electrical systems for voltages exceeding 1 kV a.c. and frequencies of 50 Hz and/or
60 Hz.
This standard is applicable to:
• single-pole phase comparators of capacitive type operating with a memory system up to
36 kV a.c.,
• two-pole phase comparators of capacitive type operating with a wireless connection up to
245 kV a.c.
This standard is applicable to phase comparators of capacitive type used in contact with the
bare conductive parts to be compared:
• as a complete device including its insulating element or
• as a separate device, adaptable to an insulating stick which, as a separate tool, is not
covered by this standard.
NOTE Some parts such as the contact electrode or the insulating element of a phase comparator as a complete
device may be dismantled.
Some restrictions on their use are applicable in the case of factory-assembled switchgear and
on overhead systems of electrified railways (see Annex A).
A device that is designed to provide other functions than phase comparison is a different
device and is not covered by this standard. For example a device designed to be also used as
a voltage detector is not covered by this standard (see Annex A).
Products designed and manufactured according to this standard contribute to the safety of
users provided they are used by persons trained for the work, in accordance with the hot stick
working method and the instructions for use.
Except when otherwise specified, all the voltages defined in this standard refer to phase-tophase
voltages of three-phase systems. In other systems, the applicable phase-to-phase or
phase-to-earth (ground) voltages should be used to determine the operating voltage

This part of IEC 61482 specifies procedures to test material and garments intended for use in
heat and flame-resistant clothing for workers if there is an electric arc hazard. A directed and
constrained electric arc in a test circuit is used to classify material and clothing in two defined
arc protection classes.
This International Standard is not dedicated toward measuring the arc rating values (ATPV1,
ELIM2 or EBT3). Procedures determining these arc rating values are prescribed in
IEC 61482-1-1, using an open arc for testing.
Other effects than the thermal effects of an electric arc like noise, light emissions, pressure
rise, hot oil, electric shock, the consequences of physical and mental shock or toxic
influences are not covered by this standard.
Protective clothing for work intentionally using an electric arc, e.g. arc welding, plasma torch,
is not covered by this standard.

This part of IEC 61243 is applicable to hand-held two-pole voltage detectors with their accessories (crocodile clips and detachable leads) to be used in contact with parts of electrical systems: – for a.c. voltages not exceeding 1 000 V at nominal frequencies between 16 2 3 Hz and up to 500 Hz, and/or
– for d.c. voltages not exceeding 1 500 V.
NOTE The a.c. voltages defined in this standard refer either to phase-to-phase voltages or phase to neutral voltages.
Contact electrode extensions are not covered by this standard. Voltage detectors covered by this standard are intended to be used under dry and humid conditions, both indoor and outdoor. They are not intended to be used under rain conditions. Voltage detectors covered by this standard are not intended to be used for continuous operation.
Voltage detectors covered by this standard are intended to be used up to 2 000 m above sea level.
This standard also includes provisions for the following supplementary functions when available (see Annex B):
– phase indication,
– rotating field indication, and
– continuity check.
Other supplementary functions are not covered by this standard. Voltage detectors covered by this standard are not considered as measuring devices. Relevant safety requirements for measuring devices are included in IEC 61010 series.

This International Standard applies to the terminology used to describe tools, devices, equipment and methods used in live working. It standardizes the name of tools, devices and equipment and permits their identification by providing definitions and illustrations.

This International Standard describes a method for calculating the minimum approach distances for live working, at maximum voltages between 72,5 kV and 800 kV. This standard addresses system overvoltages and the working air distances or tool insulation between parts and/or workers at different electric potentials. The required withstand voltage and minimum approach distances calculated by the method described in this standard are evaluated taking into consideration the following: - workers are trained for, and skilled in, working in the live working zone; - the anticipated overvoltages do not exceed the value selected for the determination of the required minimum approach distance; - transient overvoltages are the determining overvoltages; - tool insulation has no continuous film of moisture or measurable contamination present on the surface; - no lightning is seen or heard within 10 km of the work site; - allowance is made for the effect of conducting components of tools; - the effect of altitude, insulators in the gap, etc, on the electric strength is taken into consideration. For conditions other than the above, the evaluation of the minimum approach distances may require specific data, derived by other calculation or obtained from additional laboratory investigations on the actual situation.

This European Standard is applicable to all operation of and work activity on, with, or near electrical installations. These are electrical installations operating at voltage levels from and including extra-lowvoltage up to and including high voltage. This latter term includes those levels referred to as medium and extra-high voltage.

This International Standard is applicable to insulated and insulating hand tools used for working live or close to live parts at nominal voltages up to 1 000 V a.c. and 1 500 V d.c. The products designed and manufactured according to this standard contribute to the safety of the users provided they are used by skilled persons, in accordance with safe methods of work and the instructions for use (where appropriate).

This International Standard is applicable to saddles, stick clamps and their accessories, used for live working.
The products designed and manufactured according to this standard contribute to the safety of the users provided they are used by skilled persons, in accordance with safe methods of work and the instructions for use.

This European Standard is applicable to cable cutting devices to be used to verify that a cable is dead in accordance with the rules given in EN 50110-1. The following limits apply to the cable cutting devices: - pressure less than 1 000 bar or pressure (bar) x volume (l) less than 10 000; - fluid outside the categories listed in Article 9 Group 1 (explosive, extremely flammable, highly flammable, flammable (where the maximum allowable temperature is above flashpoint), very toxic, toxic, oxidizing) of the Pressure Equipment Directive. Cable cutting devices specified in this standard are for use on systems with nominal voltage up to 30 kV AC and nominal frequencies up to 60 Hz and shall only be suitable for operation by foot or by hand. This European Standard does not deal with motorised cable cutting devices. For devices to be used on systems with nominal voltages above 30 kV AC this standard should be used as a guide but additional requirements and tests shall be agreed between manufacturer and customer to provide for an equivalent level of safety. These devices are not designed to be used on cables with special armour, or with steel wires or steel tapes more than 1 mm in diameter or thickness.

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.

This part of IEC 60832 gives the essential requirements for insulating sticks for live working for use on a.c. electrical installations. Part 2 of IEC 60832 covers devices that can be attached onto and removed from the fitting of the insulating sticks. The products designed and manufactured according to this standard contribute to the safety of the users provided they are used by skilled persons, in accordance with safe methods of work and the instructions for use.

This part of IEC 60832 gives the essential requirements for devices that can be attached onto and removed from the fitting of the insulating sticks for live working, for use on a.c. electrical installations. Part 1 of IEC 60832 covers insulating sticks. In this part of the standard, the term "device" is used for "attachable device", unless otherwise specified. Products designed and manufactured according to this standard contribute to the safety of the users provided they are used by skilled persons, in accordance with safe methods of work and the instructions for use.

The European Standard EN 50110 consists of two parts:
- the first part EN 50110-1 contains minimum requirements valid for all CENELEC countries and some additional informative annexes dealing with safe working;
- the second part EN 50110-2 is a set of normative annexes (one per country) which specify either the present safety requirements or give the national supplements to these minimum requirements at the time when this European Standard was prepared.

This International Standard is applicable to electrical insulating blankets for the protection of workers from accidental contact with live or earthed electrical conductors, apparatus or circuits and avoidance of short circuits on electrical installations. Electrical insulating blankets in rolls having a width lower than 50 mm are not covered by this standard.

This part of IEC 61482 specifies test methods to measure the arc thermal performance value of materials intended for use in heat- and flame-resistant clothing for workers exposed to the thermal effects of electric arcs and the function of garments using these materials. These test methods measure the arc thermal performance value of materials which meet the following requirements: less than 100 mm char length and less than 2 s afterflame after removal from flame, when tested in accordance with ISO 15025, procedure B (bottom-edge ignition) on the outer material, and the char length measured using a modified ISO method as described in Annex A. These methods are used to measure and describe the properties of materials, products, assemblies or garments, in response to convective and radiant energy generated by an electric arc in open air under controlled laboratory conditions. The materials used in these methods are in the form of flat specimens for method A and garments for method B. Method A is used to determine the arc rating of materials and material assemblies when tested in a flat configuration. Method B is used to measure garment response, not arc rating, to an arc exposure including all the garment findings, sewing thread, fastenings, fabrics and other accessories when tested on a male mannequin torso. Method B is also used for accident replication. It is the responsibility of the user of this part of IEC 61482 to establish appropriate safety and health practices prior to use. For specific precautions, see Clause 7.

This International Standard is applicable to electrical insulating matting made of elastomer for use as a floor covering for the electrical protection of workers on electrical installations.

This International Standard covers insulating ropes that are utilized during live working procedures in contact with parts of installations operating at voltages up to and including 800 kV r.m.s. Insulating ropes for live working procedure under rain and/or d.c. conditions are not covered by this standard.

This International Standard gives the minimum requirements relative to specification, manufacture, selection, application and maintenance of tools, devices and equipment for live working. It provides the type of information which is useful to skilled persons in order to make the use of tools, devices and equipment safer. This type of information includes: . the characteristics of tools, devices and equipment; . their conditions for use; . their conditions for maintenance; . their conditions for storage and transportation. Such information may be given in standards, manufacturer's instructions for use and in internal regulations set forth by companies for their own employees. Such information should be completed by work methods, which are excluded from the scope of this standard. In this standard, the word tool(s) is used for "tools, devices and equipment for live working" unless otherwise specified.

This European Standard specifies the  requirements and tests to be fulfilled by the  multipurpose insulating sticks intended to  perform a range of operations in high voltage  installations by means of the attached  appropriate tools, for example: . connection and  disconnection of disconnectors or other  equipment operated by the stick, . fuse  replacement with an attached tool, operations  like: . voltage absence verification, using a  detector as a separate device in accordance  with EN 61243-1; . earthing and short circuiting  installations, using devices in accordance with  EN 61230; . placing insulating screens in order  to provide protection against adjacent live parts;  . testing and measurement; . any other  operation or verification on the electrical  installation, provided that the mechanical  requirements do not exceed those assured by  the stick design and the worker shall remain at a  safety distance; . rescue of accident victims.  This European Standard is applicable to the  insulating sticks made of a single continuous  tube or rod or multiple tube or rod sections  connected to each other, to be used both  indoors or outdoors on electrical systems for  voltages of 1 kV to 765 kV a.c., frequencies of  50 Hz and/or 60 Hz and in the normal range of  temperatures of -25 ¦C to +55 ¦C and at a relative  humidity between 20 % and 93 %. For the  purpose of this standard, "tube" is used for  "tube" and "rod".

This International Standard is applicable to portable equipment, with or without matching connection points, for temporary earthing or earthing and short-circuiting of electrically isolated or de-energized a.c. and d.c. installations, distribution and transmission networks, whether they are overhead or underground or of low or high voltage. This standard covers equipment comprising an earthing or a short-circuiting or an earthing and short-circuiting device and insulating component. An example is given in Figure 1a and Figure 1b. It also covers: - earthing or short-circuiting or earthing and short-circuiting devices intended to be installed with insulating means. An example of an earthing device is given in Figure 1c; - separate components, such as conductive extension (see Figure 1b) or clamp or cable with end fittings. The performance of equipment, devices and components covered by this standard is based on electro-dynamic and electro-thermal effects acting during short-circuit. The withstand capability of the devices and equipment is expressed by their rated values of current, time and peak factor. No rated voltage is given, but the geometrical dimensions of the equipment are also linked to the voltage of the installation. Examples of connection diagrams of earthing and short-circuiting devices are given in Figures 2 and 3. Associated usual lengths of cables are given in Table 1. Not covered in this standard are: - insulating means, such as insulating sticks, telescopic sticks, insulating handles, insulating gloves, aerial devices with insulating booms, insulating ropes to be used to install the earthing and short-circuiting device; - insulating components, except for basic safety requirements for the insulating element; - devices meant only for the draining of induced currents; - relevant working procedures for using portable equipment for earthing or earthing and short-circuiting.

This International Standard provides  elements for product conformity assessment.  Critical defects on tools, devices and  equipment for live working are not  acceptable. Major defects on tools, devices  and equipment for live working are likely to  result in failure or in a significant reduction of  functionality, while minor defects do not  reduce significantly the functionality. This  standard defines assessment methods for  products having completed production phase  to assure that they conform to the  requirements of the corresponding product  standard. It is to be used in conjunction with  live working corresponding product  standards. The following elements are not  covered by the present document, but are  included in each product standard: - type  tests; - provisions and description for  sampling and routine tests; - the  identification and classification of the  corresponding defects resulting from a risk  analysis.

Is applicable to portable voltage detectors, with or without built-in power sources, to be used on electrical systmes for voltages of 1kV to 765 kV a.c., and frequencies of 50 Hz and/or 60 Hz. This part applies only to voltage detectors of capacitive type used in contact with the part to be tested, as a complete device including its insulating element or as a separate device, adaptable to an insulating stick which, as a separate tool, is not covered by this standard (see 4.4.1 for general design).

Is applicable to mobile insulating hoses with fittings used with hydraulic tools and equipment for live working at nominal voltages exceeding 1 kV r.m.s. at power frequency. Insulating hoses with fittings are used to provide a connection between the hydraulic tool and the pump which are at different potentials. They are not considered as a fixed component of a live working device (e.g. aerial device). They can be connected and disconnected under negligible pressure. They can be directly handled by the user.

The purpose of this Technical Specification is to ensure that the consequences for workers of exposure to electric arcs, will not be aggravated bty the clothing itself. The Technical Specification does not include protection from current passing through the human body nor thermal protection from the heat/energy generated by the electric arc.

Published by BTWG 93-1 disbanded by D122/143

Applicable to conductive clothing, either assembled from component parts or forming a single complete clothing, worn by (electrically) skilled persons during live working (especially bare-hand working) at a nominal power system voltage up to 800 kV a.c. and ±600 kV d.c. It is applicable to conductive jackets, trousers, coveralls (one-piece clothing), gloves or mitts, hoods, shoes, overshoe socks and socks. The main changes with respect to the previous edition are listed below: - the scope has been extended to cover the use of conductive clothing to ±600 kV d.c.; - revision of the electrical resistance requirements of the fabrics used in conductive clothing; - revision of the testing procedures for complete clothing.

Covers telescopic sticks and telescopic measuring sticks to be used for live working on a.c. or d.c. electrical installations at 1 000 V and above for a.c. and 1 500 V and above for d.c. The telescopic sticks are designed to accept attachments that meet appropriate live working standards and, together with these attachments, may be used to perform mechanical work on live parts at a distance. Telescopic sticks are also designed to accept diagnostic devices that meet appropriate live working standards and are used to make the diagnostic devices reach parts of an installation to be tested. Telescopic measuring sticks, or tele-scopic sticks equipped with graduations, are used to measure distances to or between live parts. The tools (telescopic sticks and telescopic measuring sticks) covered by this standard are for use under dry conditions but could also be used under very humid conditions, using appropriate working procedures.

Supersedes EN 50237:1997

EN following parallel vote