SIST EN 50107-1:2004
(Main)Signs and luminous-discharge-tube installations operating from a no-load rated output voltage exceeding 1 kV but not exceeding 10 kV -- Part 1: General requirements
Signs and luminous-discharge-tube installations operating from a no-load rated output voltage exceeding 1 kV but not exceeding 10 kV -- Part 1: General requirements
This European Standard specifies the requirements and method of installation for signs and luminous-discharge-tube installations operating from a no-load rated output voltage exceeding 1 000 V but not exceeding 10 000 V, including the electrical components and wiring.
The standard covers installations used for publicity, decorative or general lighting purposes, either for external or internal use. Such signs or luminous-discharge-tube installations may be either fixed or portable supplied from a low-voltage (LV) or extra-low-voltage (ELV) source by means of a transformer, inverter or converter.
Leuchtröhrengeräte und Leuchtröhrenanlagen mit einer Leerlaufspannung über 1 kV aber nicht über 10 kV -- Teil 1: Allgemeine Anforderungen
Diese Europäische Norm legt Anforderungen für die Planung und Errichtung von Leuchtröhrengeräten und Leuchtröhrenanlagen mit einer Bemessungs-Ausgangs-Leerlaufspannung von über 1 000 V bis 10 000 V, einschließlich der elektrischen Bauteile und Verdrahtungen fest.
Die Norm gilt für Anlagen, die der Lichtwerbung, der Dekoration oder der Beleuchtung dienen und für den Außen- oder Innenbereich bestimmt sind. Solche Leuchtröhrengeräte oder anlagen können ortsfest oder ortsveränderlich, von einer Niederspannungs- bzw. Kleinspannungsstromquelle in Form eines Trans-formators, Wechselrichters oder Umrichters versorgt sein.
Installations d'enseignes et de tubes lumineux à décharge fonctionnant à une tension de sortie à vide assignée supérieure à 1 kV mais ne dépassant pas 10 kV -- Partie 1: Prescriptions générales
La présente Norme européenne spécifie les règles et les méthodes d'installation des enseignes et des tubes lumineux à décharge fonctionnant à une tension de sortie à vide assignée supérieure à 1 000 V mais ne dépassant pas 10 000 V, incluant les composants électriques et le câblage.
Cette norme s'applique aux installations publicitaires, décoratives ou d'éclairage général, qu'elles soient montées à l'intérieur ou à l'extérieur. Ces installations d’enseignes ou de tubes lumineux à décharge peuvent être fixes ou portatives, et fonctionner sur des alimentations basse tension (BT) ou très basse tension (TBT), au moyen d’un transformateur, onduleur ou convertisseur.
Inštalacije znakov in svetlečih razelektritvenih cevnih sijalk, ki delujejo na neobremenjenem izhodu z napetostjo med 1 kV in 10 kV - 1. del: Splošne zahteve
General Information
Relations
Standards Content (Sample)
SLOVENSKI SIST EN 50107-1:2004
STANDARD
januar 2004
Inštalacije znakov in svetlečih razelektritvenih cevnih sijalk, ki delujejo na
neobremenjenem izhodu z napetostjo med 1 kV in 10 kV - 1. del: Splošne
zahteve
(istoveten EN 50107-1:2002)
Signs and luminous-discharge-tube installations operating from a no-load rated
output voltage exceeding 1 kV but not exceeding 10 kV - Part 1: General
requirements
ICS 29.140.30 Referenčna številka
SIST EN 50107-1:2004(en)
© Standard je založil in izdal Slovenski inštitut za standardizacijo. Razmnoževanje ali kopiranje celote ali delov tega dokumenta ni dovoljeno
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EUROPEAN STANDARD EN 50107-1
NORME EUROPÉENNE
EUROPÄISCHE NORM October 2002
ICS 29.140.30 Supersedes EN 50107:1998
English version
Signs and luminous-discharge-tube installations
operating from a no-load rated output voltage
exceeding 1 kV but not exceeding 10 kV
Part 1: General requirements
Installations d'enseignes et de tubes Leuchtröhrengeräte und
lumineux à décharge fonctionnant Leuchtröhrenanlagen
à une tension de sortie à vide mit einer Leerlaufspannung
assignée supérieure à 1 kV über 1 kV aber nicht über 10 kV
mais ne dépassant pas 10 kV Teil 1: Allgemeine Anforderungen
Partie 1: Prescriptions générales
This European Standard was approved by CENELEC on 2002-01-04. 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, Czech Republic,
Denmark, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Luxembourg, Malta,
Netherlands, Norway, Portugal, Slovakia, 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
© 2002 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 50107-1:2002 E
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EN 50107-1:2002 – 2 –
Foreword
This European Standard was prepared by CENELEC BTTF 60-2, Electrical discharge lamp
installations.
The text of the draft was submitted to the Unique Acceptance Procedure and was approved by
CENELEC as EN 50107-1 on 2002-01-04.
This European Standard replaces EN 50107:1998.
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) 2003-05-01
- latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2005-01-01
Annexes designated "normative" are part of the body of the standard.
Annexes designated "informative" are given for information only.
In this standard, annex B is normative and annexes A & C are informative.
__________
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Contents
Page
1 Scope.4
2 Normative references.4
3 Definitions.5
4 Means of attachment of signs .7
5 Drain holes.7
6 Installation of the mains supply.7
7 Enclosures and protection of live parts .7
8 Protection against indirect contact.10
9 Transformers.11
10 Earth-leakage and open-circuit protection.11
11 Inverters and converters.12
12 Auxiliaries .12
13 Insulating sleeves.12
14 Specification and installation of high-voltage cables .12
15 High-voltage connections.14
16 Supports for luminous-discharge tubes.15
17 Electromagnetic compatibility.15
18 Inspection and testing of installations .15
19 Marking .16
20 Maintenance.17
Annex A (informative) - List of high-voltage cables specified in EN 50143.23
Annex B (normative) - Special national conditions .24
Annex C (informative) - A-deviations.25
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EN 50107-1:2002 – 4 –
1 Scope
This European Standard specifies the requirements and method of installation for signs and
luminous-discharge-tube installations operating from a no-load rated output voltage exceeding
1 000 V but not exceeding 10 000 V, including the electrical components and wiring.
The standard covers installations used for publicity, decorative or general lighting purposes,
either for external or internal use. Such signs or luminous-discharge-tube installations may be
either fixed or portable supplied from a low-voltage (LV) or extra-low-voltage (ELV) source by
means of a transformer, inverter or converter.
2 Normative references
This European Standard incorporates by dated or undated reference, provisions from other
publications. These normative references are cited at the appropriate places in the text and the
publications are listed hereafter. For dated references, subsequent amendments to or revisions
of any of these publications apply to the European Standard only when incorporated in it by
amendment or revision. For undated references the latest edition of the publication referred to
applies.
1)
EN 50107-2 , Signs and luminous-discharge-tube installations operating from a no-load rated
output voltage exceeding 1 kV but not exceeding 10 kV – Part 2: Requirements for earth-leakage
and open-circuit protective devices
1)
EN 50143:1997 + A1:200X , Cables for signs and luminous-discharge-tube installations
operating from a no-load rated output voltage exceeding 1 kV but not exceeding 10 kV
EN 60529:1991, Degrees of protection provided by enclosures (IP Code) (IEC 60529:1989)
EN 60598-1:2000, Luminaires — Part 1: General requirements and tests
(IEC 60598-1:2000, mod.)
EN 61347-2-10, Lamp controlgear — Part 2-10: Particular requirements for electronic inverters
and converters for high-frequency operation of cold start tubular discharge lamps (neon tubes)
(IEC 61347-2-10)
EN 61050, Transformers for tubular discharge lamps having a no-load output voltage exceeding
1 kV (generally called neon-transformers) — General and safety requirements
(IEC 61050:1991 + corrigendum March 1992, mod.)
HD 384 (series), Electrical installations of buildings (IEC 60364 series, mod.)
IEC 60050, International Electrotechnical Vocabulary
ISO 3864:1984, Safety colours and safety signs
———————
1)
To be published.
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3 Definitions
For the purposes of this European Standard, the definitions given in IEC 60050 (IEV) apply,
together with the following.
NOTE 1 Sections 602 - 605 of IEC 60050 contain definitions relating to the generation, transmission and distribution
of electricity.
NOTE 2 Where the terms 'voltage' and 'current' are used, they refer to r.m.s. values, unless otherwise stated.
3.1
luminous-discharge tube
tube, or other vessel or device, which is constructed of translucent material, hermetically sealed,
and designed for the emission of light arising from the passage of an electric current through a
gas or vapour contained within it
NOTE The tube may be with or without a fluorescent coating.
3.2
no-load rated output voltage
maximum rated voltage between the terminals of the output winding(s) of the transformer,
inverter or converter connected to the rated supply voltage at rated frequency, with no load on
the output circuit
NOTE 1 For output circuits supplied by transformers, it is the peak value divided by the square root of 2 (see
EN 61050).
NOTE 2 For output circuits supplied by inverters or converters, it is the r.m.s. value or the peak value divided by 2,
whichever is the greater (see EN 61347-2-10).
3.3
creepage distance
shortest path between two conductive parts or between a live part and an accessible surface of
an enclosure, earthed metalwork or flammable materials, measured along the surface of the
insulation material
3.4
clearance
shortest distance between two conductive parts or between a live part and an accessible surface
of an enclosure, earthed metalwork or flammable materials, measured through the air
3.5
transformer
a static piece of apparatus with two or more windings which, by electromagnetic induction,
transforms a system of alternating voltage and current into another system of voltage and current
usually of different values and at the same frequency for the purpose of transmitting electrical
power
[IEV 421-01-01]
NOTE The high output impedance of most transformers designed for cold-cathode discharge tubes allows the
characteristics of transformer and current-limiting components to be combined in one unit.
3.6
inverter
transducer that converts direct current to alternating current
3.7
converter
unit for the electronic conversion of an a.c. supply at one frequency to an a.c. supply at another
frequency
NOTE The voltage may or may not be altered during the conversion.
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EN 50107-1:2002 – 6 –
3.8
insulating sleeve
insulation designed to be placed over the exposed high-voltage connections at tube electrodes
or over cable-end insulators
3.9
installer
person, qualified in sign installation practice, who takes responsibility for the installation and its
testing in accordance with this standard
3.10
earth-leakage protective device
device which will remove the output power from one or more transformer(s), inverter(s) or
converter(s) in the event of a short circuit between any relevant part of the output circuit and
earth
3.11
open-circuit protective device
device which will remove the output power from one or more transformer(s), inverter(s) or
converter(s) in the event of an interruption of the secondary high voltage circuit
3.12
live part
conductor or conductive part intended to be energized in normal operation, including a neutral
conductor but, by convention, not a PEN conductor, PEM conductor or a PEL conductor.
NOTE This concept does not necessarily imply a risk of electric shock.
3.13
input circuit
that part of the device or installation between the point at which electrical energy is supplied to
an installation and the input terminals of the transformer, converter or inverter
NOTE Also known as a 'mains supply circuit'.
3.14
output circuit
that part of the device or installation between the output terminals of the transformer, converter
or inverter and the discharge tubes inclusive
NOTE Also known as a 'lamp circuit'.
3.15
arm's reach
zone extending from any point on a surface where persons usually stand or move about to the
limits which a person can reach with the hand in any direction without assistance
NOTE This zone of accessibility is shown in Figure 1 in which the values refer to bare hands without any assistance,
e.g. from tools or from a ladder.
3.16
outdoors
location where all or part of a sign or luminous-discharge-tube installation or its components are
situated out of doors and are subject to the effects of weather
3.17
dry room; dry location
room or location where condensation does not usually occur or the air is not saturated with
moisture
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3.18
damp or wet room
room where the safety of the sign or luminous-discharge-tube installation could be affected by
humidity, condensation, chemical or similar influences
3.19
small portable sign
small sign which can easily be moved from one place to another; which is supplied with an
integral transformer, inverter or converter, together with a flexible mains supply lead and plug;
and which is intended to be installed and connected by the customer to a socket outlet of the
mains supply
3.20
flasher
device for automatically switching one or more output circuits on and off continuously
NOTE The sequence of switching of the various output circuits may be suitably arranged to provide the impression
of movement and other animated effects.
4 Means of attachment of signs
Electrical conductors shall be not used as means of suspension or attachment of signs.
5 Drain holes
In sign enclosures intended for external use, arrangements shall be made to allow moisture to
drain away. Drain holes or similar apertures used for this purpose shall be sufficiently large to
ensure that they do not become blocked with dirt or debris between maintenance visits.
6 Installation of the mains supply
Installation of the mains supply for signs and luminous-discharge-tube installations shall be
carried out in accordance with HD 384.
NOTE Attention is drawn to the fact that wiring rules are not fully harmonized in CENELEC countries and, for this
reason, national standards may apply.
7 Enclosures and protection of live parts
7.1 All high-voltage connections to discharge tubes shall be protected by means of insulating
sleeves conforming to clause 13.
7.2 High-voltage connections situated within arm's reach (see 3.15) shall have additional
protection conforming to 7.4 and 7.5.
7.3 High-voltage connections situated out of arm's reach shall have additional protection
conforming to 7.4 or 7.6.
7.4 Additional protection shall consist of an enclosure or other means of protection
conforming to the following:
a) It shall provide a degree of protection corresponding to at least IP 2X as specified in
EN 60529, Table 1.
NOTE 1 The requirements for protection against ingress of solid objects, specified in EN 60529, Table 2, do not
apply.
NOTE 2 See Annex C, A-deviations.
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EN 50107-1:2002 – 8 –
b) If it is constructed from metal parts, these shall be earthed in accordance with clause 8.
c) If it is constructed from other materials, these shall be materials that have been certified
by the supplier as suitable for use in the environment existing close to a tube electrode. The
installer shall obtain from the supplier a guarantee for the materials covering the expected
lifetime of the installation.
NOTE 3 Suppliers of such materials should be informed of the temperature, ultraviolet (UV) radiation, ozone and
other conditions existing near a tube electrode. They should also be informed that such materials might be used
in exterior situations.
d) Access to the interior of an enclosure shall be by means of a tool, e.g. a screwdriver.
NOTE 4 Other means of additional protection may be permanent, e.g. it may have to be cut away using a knife.
NOTE 5 A fully enclosed sign letter or box sign is considered to be a suitable enclosure for this purpose.
7.5 Additional protection shall consist of either
a) an enclosure as specified in 7.4 where the degree of protection (IP 2X) is maintained
even if any external parts of a tube are broken, or
b) an enclosure as specified in 7.4 plus open-circuit protection conforming to the
requirements of EN 50107-2.
NOTE The requirement of 7.5 a) means that it is not possible to insert the appropriate test finger into the
broken end of a tube and touch a live electrode.
7.6 Additional protection shall consist of open-circuit protection conforming to the
requirements of EN 50107-2.
7.7 Symbols for 'caution, risk of electric shock' conforming to B.3.6 of ISO 3864:1984 shall be
fixed at points of access to any sign, luminous-discharge-tube installation or enclosure
containing high-voltage transformers, inverters or converters.
NOTE In small installations of limited extent, one such symbol is normally adequate. More than one symbol should
be used for larger installations and these should be arranged so that at least one is visible from any likely direction of
approach to the installation.
7.8 A conductor which is in metallic contact with a discharge tube operating at high voltage
shall not be in connection (except in respect of its connection to earth) with any other conductor
of the mains supply or with the primary winding of the transformer.
7.9 The creepage distances and clearances in millimetres between the following shall be as
specified in Tables 1, 2, 3 or 4, as appropriate:
a) between live parts carrying different voltage supplies;
b) between live parts and earthed metalwork;
c) between live parts and parts which are flammable; or
d) between live parts and parts that can be touched with the standard test probe.
NOTE 1 The voltage given in Tables 1 to 4 is either the no-load rated output voltage between terminals or the
no-load rated output voltage between terminals and earth, as appropriate, of the transformer, inverter or converter
supplying the circuit.
NOTE 2 When considering the creepage distance or clearance from an electrode connection to, for example,
earthed metal, the extra distance taken by an electrical discharge around the electrode sleeve may be taken into
account (see 7.10) provided the distance conforms to 7.11.
NOTE 3 In most situations, the installer needs to consider the creepage distances and clearances between live parts
and earth so the voltage in Tables 1 to 4 is the no-load rated output voltage to earth. The total no-load rated output
voltage needs to be used only on the rare occasions when creepage distances and clearances between live terminals
are being considered. For example, for a transformer rated at 5 kV – E – 5 kV, creepage distances and clearances for
a voltage of 5 kV (not 10 kV) need to be taken from Tables 1 to 4, as applicable.
NOTE 4 An illustration of creepage distances and clearances is given in Figures 5 and 6. Figure 6 illustrates how the
distances are increased with the use of an electrode sleeve.
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Table 1 — Creepage distances and clearances for equipment operating at normal mains
frequency, which is installed in dry rooms and similar protected situations
No-load rated output voltage Shortest creepage distance Shortest clearance
(see note 3 above)
kV mm mm
greater than 1,0 to 1,75 11 8
greater than 1,75 to 2,25 13 9
greater than 2,25 to 3,0 16 11
greater than 3,0 to 4,0 19 13
greater than 4,0 to 5,0 23 15
greater than 5,0 to 6,0 27 17
greater than 6,0 to 8,0 32 20
greater than 8,0 to 10,0 40 25
Table 2 — Creepage distances and clearances for equipment operating at frequencies greater
than 1 kHz, which is installed in dry rooms and similar protected situations
No-load rated output voltage Shortest creepage distance Shortest clearance
(see note 3 above)
KV mm mm
greater than 1,0 to 1,75 13 10
greater than 1,75 to 2,25 16 11
greater than 2,25 to 3,0 19 13
greater than 3,0 to 4,0 23 16
greater than 4,0 to 5,0 28 18
greater than 5,0 to 6,0 32 20
greater than 6,0 to 8,0 38 24
greater than 8,0 to 10,0 48 30
Table 3 — Creepage distances and clearances for equipment operating at normal mains
frequency which is installed outdoors or in damp or wet rooms
No-load rated output voltage Shortest creepage distance Shortest clearance
(see note 3 above)
kV mm mm
greater than 1,0 to 1,75 17 11
greater than 1,75 to 2,25 21 13
greater than 2,25 to 3,0 25 15
greater than 3,0 to 4,0 31 18
greater than 4,0 to 5,0 37 21
greater than 5,0 to 6,0 44 24
greater than 6,0 to 8,0 53 28
greater than 8,0 to 10,0 65 34
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EN 50107-1:2002 – 10 –
Table 4 — Creepage distances and clearances for operating at frequencies greater than 1 kHz,
which is installed outdoors or in damp or wet rooms
No-load rated output voltage Shortest creepage distance Shortest clearance
(see note 3 above)
KV mm mm
greater than 1,0 to 1,75 20 13
greater than 1,75 to 2,25 25 16
greater than 2,25 to 3,0 30 18
greater than 3,0 to 4,0 37 22
greater than 4,0 to 5,0 44 25
greater than 5,0 to 6,0 53 29
greater than 6,0 to 8,0 64 34
greater than 8,0 to 10,0 78 41
7.10 If a possible discharge path comprises both creepage paths and clearances (see
example in Figure 6), the total path length shall be not less than the shortest clearance given in
Tables 1 to 4 as applicable.
NOTE An example would be a sign operating outdoors (Table 3) from a transformer having a no-load rated output
voltage of 10 kV (5 kV to earth). Adding up all the creepage distances and clearances to earth, the total distance
between the electrode connection and earth, as shown, for example, in Figure 6, has to be at least 21 mm.
7.11 The minimum distance between the outside surface of an electrode sleeve and earth or
flammable materials shall be not less than half the relevant clearance value taken from Tables 1
to 4 as applicable (see the example in Figure 6).
8 Protection against indirect contact
8.1 The protection against indirect contact shall be provided by equipotential bonding,
applied between all metal parts and then connected to earth.
8.2 All exposed metalwork, with the exception of clips and clamps for fixing cables and tubes,
shall be bonded together by means of a protective conductor and, unless this metalwork is
connected to earth by other means, shall be provided with an earthing terminal.
8.3 The protective conductor shall be one of the following:
a) a separate cable having insulation coloured yellow/green and having the following cross-
sectional area:
2
i) in situations where it may suffer mechanical stress, 4 mm ;
2
ii) in other situations, 2,5 mm ; or
b) a stranded or solid copper conductor having a minimum cross-sectional area of not less than
2
1,5 mm , manufactured as part of a sheathed high-tension cable and protected by the overall
sheath of that cable; or
c) the braided metal screen of a high-voltage cable, provided that the total cross-sectional area
2
of the individual strands comprising that screen is not less than 1,5 mm . Connections to the
screen shall be made by unravelling the braid and twisting the individual strands together to
form a suitable length of conductor to attach to an earth terminal. The connection shall not be
by means of a metal clamp around the braid.
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8.4 Where metal parts are joined together, means shall be employed to ensure that earth
continuity is maintained across the joint.
NOTE This is particularly important where the metal parts are painted or where they are joined together by adhesive.
8.5 Equipotential bonding conductors shall be not connected to the neutral terminal of the
mains supply to the sign or luminous-discharge-tube installation, except as specified in HD 384
for protective multiple earthing arrangements in TN-C systems.
9 Transformers
Transformers shall conform to EN 61050.
10 Earth-leakage and open-circuit protection
10.1 The safety and performance requirements for earth-leakage and open-circuit protection
devices are specified in EN 50107-2.
10.2 All high-voltage circuits supplied from transformers, inverters or converters, with the
exception of Type A converters as specified in EN 61347-2-10, shall be protected by an earth-
leakage protective device conforming to 10.3. The installer shall ensure that performance of the
earth-leakage protective device is certified by the manufacturer of the device as conforming to
EN 50107-2.
10.3 In the event of accidental contact between the high-voltage circuit and earth, the earth-
leakage protective device shall either disconnect the mains supply to the input circuit, or
otherwise remove the earth-leakage current.
NOTE A standard residual-current-operated circuit-breaker is not a suitable protective device for this application
since, when connected to the primary side of a transformer, inverter or converter, it does not protect against faults to
earth on the secondary side.
10.4 Where specified in 7.4 and 7.6, high-voltage circuits supplied from transformers, inverters
or converters, with the exception of Type A converters as specified in EN 61347-2-10, shall be
protected by an open-circuit protective device conforming to 10.5. The installer shall ensure that
performance of the open-circuit protective device is certified by the manufacturer of the device
as conforming to EN 50107-2.
10.5 In the event of an open circuit occurring in the high-voltage circuit, the open-circuit
protective device shall either disconnect the mains supply to the input circuit, or otherwise
remove the output voltage.
10.6 If the circuit includes a flasher, any protective switch and its reset circuit shall be
installed on the mains-supply side of the flasher.
NOTE If they were on the other side of the flasher, the switch would keep re-setting and re-tripping during fault
conditions.
10.7 If the circuit includes a flasher and the device(s) to remove the output power is
incorporated within the housing of the transformer(s), inverter(s) or converter(s), either a
protective switch shall be connected on the mains-supply side of the flasher and the incorporated
sensor circuits shall be capable of operating this second switch; or other means shall be
provided to prevent the protective device resetting every time the flasher switches the mains
supply off and on again.
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EN 50107-1:2002 – 12 –
11 Inverters and converters
11.1 Inverters and converters shall conform to EN 61347-2-10.
11.2 The installer shall ensure that inverters and converters are suitable for their intended
application in respect of:
a) supply voltage, or voltage range;
b) input current or input power;
c) input and output frequencies;
d) no-load rated output voltage, including tolerance;
e) rated output current and current range;
f) earth connections to the output circuit.
NOTE Inverters and converters provide a high-frequency, high-voltage output. The effects of high frequency supplies
on the insulation and operation of circuits and components should be carefully considered.
11.3 Inverters and converters shall be installed in accordance with the manufacturer's
instructions.
11.4 The length and type of cable connecting the high-voltage terminal of an inverter or
converter to a discharge tube shall not exceed that specified by the manufacturer.
12 Auxiliaries
Independent auxiliaries for signs and luminous-discharge-tube installations operating at high
voltage, such as inductors, capacitors and resistors, shall be protected by being placed within an
enclosure conforming to clause 7.
13 Insulating sleeves
Insulating sleeves, used for the protection of electrodes and the connections, shall be made from
one of the following:
a) glass having a minimum wall thickness of 1 mm; or
b) silicone rubber, having a breakdown voltage certified by the supplier as not less than twice
the no-load rated output voltage to earth of the transformer, inverter or converter supplying
the circuit, a wall thickness of not less than 1 mm and an operating temperature of not less
than 180 °C; or
c) material with insulating, resistance to UV radiation and ozone and heat-resistance
characteristics at least equivalent to those specified in b).
NOTE The value of 180 °C, given in 13 b), is under consideration.
14 Specification and installation of high-voltage cables
14.1 High-voltage cables shall be selected fro
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