SIST-TS CLC/TS 50703-1:2021

SLOVENSKI STANDARD
01-september-2021
Nadomešča:
SIST-TS CLC/TS 50703-1:2020
Elementi za zaščito pred strelo (LPSC) - 1. del: Zahteve za preskušanje spojev
kovinskih plošč, uporabljenih v LPS
Lightning Protection System Components (LPSC) - Part 1: Testing requirements for
metal sheets' joints used in LPS
Ta slovenski standard je istoveten z: CLC/TS 50703-1:2021
ICS:
91.120.40 Zaščita pred strelo Lightning protection
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

TECHNICAL SPECIFICATION CLC/TS 50703-1

SPÉCIFICATION TECHNIQUE
TECHNISCHE SPEZIFIKATION
June 2021
ICS 91.120.40 Supersedes CLC/TS 50703-1:2019
English Version
Lightning Protection System Components (LPSC) - Part 1:
Testing requirements for metal sheets' joints used in LPS
Composants des systèmes de protection contre la foudre Blitzschutzsystembauteile (LPSC) - Teil 1:
(CSPF) - Partie 1: Exigences d'essais relatives aux Prüfanforderungen für in Blitzschutzsystemen (LPS)
jonctions des bandes métalliques utilisées dans les SPF verwendete Verbindungsstellen zwischen Metallblechen
This Technical Specification was approved by CENELEC on 2021-05-11.

CENELEC members are required to announce the existence of this TS in the same way as for an EN and to make the TS available promptly
at national level in an appropriate form. It is permissible to keep conflicting national standards in force.

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, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and the United Kingdom.

European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2021 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. CLC/TS 50703-1:2021 E

Contents Page
European foreword . 3
1 Scope . 4
2 Normative references . 4
3 Terms and definitions . 4
4 Classification . 7
5 Requirements . 7
5.1 General . 7
5.2 Installation instructions . 8
5.3 Marking . 8
5.4 Lightning current carrying capability . 8
6 Tests . 8
6.1 General condition on tests . 8
6.2 Installation instructions . 9
6.2.1 General conditions for tests . 9
6.2.2 Acceptance criteria . 9
6.3 Marking test . 9
6.3.1 General conditions for tests . 9
6.3.2 Acceptance criteria for marking completeness . 9
6.3.3 Acceptance criteria for marking durability and legibility . 9
6.4 Test preparation. 10
6.4.1 Arrangement of specimen . 10
6.4.2 Conditioning / ageing . 10
6.4.3 Lightning current test . 10
6.4.4 Acceptance criteria according to the ability to pass the lightning
current tests H or N with respect to perforation NP or P . 11
7 Structure and content of the test report . 11
7.1 General . 11
7.2 Report identification . 12
7.3 Specimen description . 12
7.4 Material . 13
7.5 Standards and references . 13
7.6 Test procedure. 13
7.7 Testing equipment description . 13
7.8 Measuring instruments description . 13
7.9 Requirements for an approved measuring system . 13
7.10 Results and parameters recorded . 13
7.11 Statement of pass / fail . 14
Bibliography . 20

European foreword
This document (CLC/TS 50703-1:2021) has been prepared by CLC/TC 81X “Lightning
protection”.
This document supersedes CLC/TS 50703-1:2019.
The document includes the following significant changes with respect to the previous edition:
a) precise terms / definitions are given for the reader to understand and distinguish the
under discussion types of the joints of metal sheets;
b) conditioning tests have been added which contribute significant on the lightning current
capability;
c) two new classifications have been added as per the ability of the joints of metal sheets to
withstand the lightning current with or without perforation;
d) Table 1 – Clarifications that are more precise are given for parameters of the test current;
e) requirements for approved measuring system have been added under clause 7.9.
Attention is drawn to the possibility that some of the elements of this document may be the
subject of patent rights. CENELEC shall not be held responsible for identifying any or all such
patent rights.
1 Scope
This document defines the requirements and testing for joints of metal sheets, with or without
insulating coatings, used as natural components in roofs, facades or walls of buildings,
suitable to conduct lightning current in LPS where the interconnection of these metal sheets
does not ensure durable electrical connection.
NOTE This document does not deal with the lightning interception capabilities of these
components. The connection clamps for connecting the metallic sheet with the down conductor to the
earth termination system are LPSC, tested according to EN 62561-1.
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 60068-2-52:1996, Environmental testing - Part 2: Tests - Test Kb: Salt mist, cyclic
(sodium chloride solution) (IEC 60068-2-52:1996)
EN 62305-3:2011, Protection against lightning - Part 3: Physical damage to structures and life
hazard (IEC 62305-3:2010)
EN 62561-1:2017, Lightning Protection System Components (LPSC) - Part 1: Requirements
for connection components (IEC 62561-1:2017)
ISO 22479:2019, Corrosion of metals and alloys - Sulfur dioxide test in a humid atmosphere
(fixed gas method)
ISO 6957:1988, Copper alloys - Ammonia test for stress corrosion resistance
3 Terms and definitions
For the purpose of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following
addresses:
— IEC Electropedia: available at https://www.electropedia.org/
— ISO Online browsing platform: available at https://www.iso.org/obp
3.1
joint of metal sheets
electrical and mechanical connection between metal sheets with or without insulating coating
Note 1 to entry: Typical joints are shown in Figures A.1 and A.2 in Annex A.
Note 2 to entry: A thin coating of protective paint or about 1 mm asphalt or 0,5 mm PVC is not
regarded as an insulator.
3.2
durability
ability to perform as required, under given conditions of use and maintenance, until the end of
useful life
3.3
material connected metal sheets
connection between two metal sheets (e.g. by means of welding, brazing or soldering), which
allows no relative movement of metal sheets due to thermal expansion and to environmental
load, e.g. snow, ice, wind where the interconnection of these metal sheets does assure
durable electrical connection
3.4
force-locked metal sheets
connection between two metal sheets (e.g. by means of crimping, clamping, bolting or
screwing), which does not allow any relative movement of metal sheet’s due to thermal
expansion and to environmental load, e.g. snow, ice, wind where the interconnection of these
metal sheets does assure durable electrical connection
3.5
form-locked metal sheets
connection between two metal sheets (e.g. by seaming, overlapping and zipping, locked
overlapping or hooking), which allows a small relative movement of metal sheet’s due to
thermal expansion and to environmental load, e.g. snow, ice, wind where the interconnection
of these metal sheets does not assure durable electrical connection, as typically shown in
Annex A
3.6
non-locked metal sheets
connection between two metal sheets (e.g. by means of overlapping), which allows a small
relative movement due to thermal expansion and to environmental load, e.g. snow, ice, wind
where the interconnection of these metal sheets does not assure durable electrical
connection, as typically shown in Annex A
3.7
electrical continuity
transmission path in an electrical connection
[SOURCE: 714-11-17, modified]
3.8
durable electrical continuity
transmission path in an electrical connection without requiring excessive maintenance or
repair, when faced with the challenges of normal operation (load caused by a surge current
during a lightning strike) over its design lifetime
Note 1 to entry: According to EN 62305-3:2011, 5.2.5 and 5.5.3, the electrical continuity between the
various parts is made durable (e.g. by means of brazing, welding, crimping, seaming, screwing or
bolting and clamping).
[SOURCE: IEV 131-12-74, modified]
3.9
electrical connection
intentional electric contact between conductors
[SOURCE: IEV 131-12-74, modified]
3.10
durable electrical connection
intentional electric contact between mechanically material connected or force-locked
conductors without requiring excessive maintenance or repair, when faced with the
challenges of normal operation (load caused by a surge current during a lightning strike) over
its design lifetime
Note 1 to entry: Those durable electrical connections shall fulfil the requirements of EN 62561-1.
Note 2 to entry: According to EN 62305-3:2011, 5.2.5, the electrical continuity between the various
parts is made durable (e.g. by means of brazing, welding, crimping, seaming, screwing or bolting) when
the metal is not clad with insulating material.
Note 3 to entry: According to EN 62305-3:2011, 5.3.5 and 5.5.3, the connections shall be made
secure by such means as brazing, welding, clamping, crimping, seaming, screwing or bolting) where the
metal installations may be clad with insulating material.
Note 4 to entry: According to Scope of EN 62561-1:2017, the following connection types shall be
considered as connection components: exothermic, brazing, welding, clamping, crimping, seaming,
screwing or bolting.
[SOURCE: IEV 131-12-74, modified]
3.11
non durable electrical connection
intentional electric contact between mechanically form-locked or non-locked connections
requiring excessive maintenance or repair, when faced with the challenges of normal
operation (load caused by a surge current during a lightning strike) over its design lifetime
Note 1 to entry: The type test according to CLC/TS 50703-1 is required.
Note 2 to entry: The electrical continuity between the various parts is made non-durable (e.g. by
means of seaming, overlapping and zipping, locked overlapping, overlapping or hooking) as shown in
Figures A.1 and A.2 in Annex A.
[SOURCE: IEV 131-12-74]
3.12
durable electrical connection of metal sheets
electrical connection of metal sheets made by material connection or force-locked connection
of bare metal sheets
Note 1 to entry: Those durable connections shall fulfil the requirements of EN 62561-1.
Note 1 to entry: According to EN 62305-3:2011, 5.2.5 and 5.5.3, the electrical continuity between the
various parts is made durable (e.g. by means of brazing, welding, crimping, seaming, screwing or
bolting and clamping).
3.13
non-durable electrical connection of metal sheets
electrical connection of metal sheets made by form-locked or non-locked connection of bare
metal sheets or coated metal sheets which does not ensure durable electrical connection
Note 1 to entry: The type test according to CLC/TS 50703-1 is required.
Note 2 to entry: The electrical continuity between the various parts is made non-durable (e.g. by
means of seaming, overlapping and zipping, locked overlapping, overlapping or hooking).
3.14
type test
test required to be made before supplying a type of material covered by this document on a
general commercial basis, in order to demonstrate satisfactory performance characteristics to
meet the intended application
Note 1 to entry: These tests are of such a nature that, after they have been done, they don’t need to
be repeated unless changes are made to the accessory materials, design or type of manufacturing
process which might change the performance characteristics.
3.15
natural component of LPS
conductive component installed not specifically for lightning protection which can be used in
addition to the LPS or in some cases could provide the function of one or more parts of the
LPS
Note 1 to entry: Example of the use of this term include:
—  natural air-termination;
—  natural down-conductor;
—  natural earth electrode.
4 Classification
4.1 Classification of non-durable joints of metal sheets according to the ability to withstand
lightning current:
a) class H for heavy duty;
b) class N for normal duty.
The selection of classes H and N should be performed by the manufacturer in accordance
with the test parameters identified in Table 1.
4.2 Classification of non-durable joints of metal sheets according to the ability to pass the
lightning current tests with respect to perforation as follows:
a) class NP joints of metal sheets without perforation;
2.
b) class P joints of metal sheets with perforation with a size less than 2 cm
The selection of classes NP and P shall be performed by the manufacturer of the joints of
metal sheets in accordance with the intended application.
5 Requirements
5.1 General
Joints of metal sheets shall be designed in such manner that when they are inst
...