IEC 60519-21:2008

Safety in electroheat installations - Part 21: Particular requirements for resistance heating equipment - Heating and melting glass equipment

IEC 60519-21:2008 is applicable to indirect resistance heating equipment for the heating and melting of glass, operating in voltage bands 1 and 2. These particular requirements also apply to equipment for direct resistance heating and melting of glass by means of current introduced by electrodes passing through the charge to be heated. This new edition of IEC 60519-21 takes into account the latest editions of IEC 60519-1, of IEC 60519-2 and of IEC 60050-841.

Sécurité dans les installations électrothermiques - Partie 21: Exigences particulières pour les installations de chauffage par résistance - Installations électrothermiques de fusion de verre

La CEI 60519-21:2008 s'applique aux installations de chauffage indirect par résistance pour le chauffage et la fusion du verre, fonctionnant dans les domaines de tension 1 et 2. Ces exigences particulières s'appliquent aussi aux installations de chauffage direct par résistance et de fusion du verre au moyen du courant introduit par les électrodes et circulant à travers la charge à chauffer. Cette nouvelle édition prend en compte les dernières éditions de la CEI 60519-1, de la CEI 60519-2 et de la CEI 60050-841.

General Information

• Status: Withdrawn
• Publication Date: 25-Sep-2008
• Withdrawal Date: 24-Sep-2018
• ICS: 25.180.10 - Electric furnaces
• Technical Committee: TC 27 - Industrial electroheating and electromagnetic processing
• Drafting Committee: MT 19 - TC 27/MT 19
• Current Stage: WPUB - Publication withdrawn
• Start Date: 26-Sep-2018
• Completion Date: 27-Sep-2018

Standards Content (Sample)

IEC 60519-21



Edition 2.0 2008-09



INTERNATIONAL



STANDARD



NORME
INTERNATIONALE


Safety in electroheat installations –
Part 21: Particular requirements for resistance heating equipment – Heating and
melting glass equipment

Sécurité dans les installations électrothermiques –
Partie 21: Exigences particulières pour les installations de chauffage par
résistance – Installations électrothermiques de fusion de verre


IEC 60519-21:2008

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IEC 60519-21



Edition 2.0 2008-09



INTERNATIONAL



STANDARD



NORME
INTERNATIONALE


Safety in electroheat installations –
Part 21: Particular requirements for resistance heating equipment – Heating and
melting glass equipment

Sécurité dans les installations électrothermiques –
Partie 21: Exigences particulières pour les installations de chauffage par
résistance – Installations électrothermiques de fusion de verre


INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
H
CODE PRIX
ICS 25.180.10 ISBN 978-2-88910-206-8
® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale

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CONTENTS

FOREWORD.3


1 Scope and object.5

2 Normative references .5

3 Terms and definitions .5


4 Classification of electroheat equipment according to voltage bands.6

5 Classification of electroheat equipment according to frequency bands.6

6 General requirements .6

7 Isolation and switching .6
8 Connection to the supply network and internal connections .6
9 Protection against electric shock .6
10 Protection against overcurrent.7
11 Equipotential bonding .7
12 Control circuits and control functions .7
13 Protection against thermal influences .7
14 Risk of fire and danger of explosion.7
15 Marking, labelling and technical documentation .7
16 Information on inspection and commissioning and instructions for utilization and
maintenance of electroheat installations .7

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60519-21 © IEC:2008 – 3 –


INTERNATIONAL ELECTROTECHNICAL COMMISSION

____________



SAFETY IN ELECTROHEAT INSTALLATIONS –



Part 21: Particular requirements

for resistance heating equipment –

Heating and melting glass equipment





FOREWORD
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8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
patent rights. IEC shall not be held responsible for identifying any or all such patent rights.

International Standard IEC 60519-21 has been prepared by IEC technical committee 27:
Industrial electroheating equipment.
This second edition cancels and replaces the first edition published in 1998 and constitutes a
technical revision. The significant changes with respect to the previous edition are as follows:
– The latest editions of IEC 60519-1:2003 and IEC 60519-2:2006 have been taken into
account.
– Definitions have been brought into line with the second edition of IEC 60050-841:2004.
This standard is to be used in conjunction with IEC 60519-2:2006. It is intended to specify
particular requirements for resistance heating and melting glass equipment. This Part 21
supplements or modifies the corresponding clauses of IEC 60519-2, so as to convert it into an
IEC standard.

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– 4 – 60519-21 © IEC:2008


Where a particular subclause of Part 2 is not mentioned in this Part 21, that subclause applies

as far as is reasonable. Where this standard states "addition", "modification" or "replacement",

the relevant text of Part 2 is to be adapted accordingly.


NOTE Subclauses and notes which are additional to those in Part 2 are numbered starting from 101.


The text of this standard is based on the following documents:


CDV Report on voting

27/630/CDV 27/649/RVC



Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
A list of all parts of IEC 60519 series, under the general title Safety in electroheat installations,
can be found on the IEC website.
The committee has decided that the contents of this publication will remain unchanged until
the maintenance result date indicated on the IEC web site under "http://webstore.iec.ch" in
the data related to the specific publication. At this date, the publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.

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60519-21 © IEC:2008 – 5 –


SAFETY IN ELECTROHEAT INSTALLATIONS –



Part 21: Particular requirements

for resistance heating equipment –

Heating and melting glass equipment








1 Scope and object

Replacement:
This part of IEC 60519 is applicable to indirect resistance heating equipment for the heating
and melting of glass, operating in voltage bands 1 and 2. These particular requirements also
apply to equipment for direct resistance heating and melting of glass by means of current
introduced by electrodes passing through the charge to be heated.
The object of this standard is the determination of safety requirements for both indirect and
direct resistance heating equipment for the heating and melting of glass.
NOTE Extraction of liquid glass or a similar material at the extraction point is part of the production process and
does not constitute part of the operation of the electroheat equipment.
This standard covers the safety aspects of electrical parts also in the case when electrical
heating is combined with other means of heating, for example liquid fuel heating.
These requirements do not apply to equipment for direct resistance heating, where, owing to
the technology used, IEC 60519-3, IEC 60519-4 and IEC 60519-8 are applicable.
2 Normative references
This Clause of part 2 is applicable.
3 Terms and definitions
This Clause of part 2 applies except as follows:
Addition:

3.101
glass-melting furnace (indirect resistance heating)
furnace in which glass is melted by means of indirect resistance heating
3.102
pot furnace
melting equipment in which the batch is melted by means of indirect electrical heating in
vessels called “pots” made of a fire-proof material and placed in the furnace
3.103
filling machine
machine which feeds the batch into the glass furnaces

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3.104

extraction machine

machine which extracts molten glass from the glass furnaces


3.105

extraction point

opening in the glass furnace through which molten glass is drawn off


NOTE Molten glass is drawn off for example, manually by means of glassmakers’ tools or by means of extraction
machines. In the case of pot furnaces, the extraction points also serve as openings for the feeding or extraction of
samples.


3.106
earthing electrode
electrode that is installed in the glass melt and is connected to the equipotential system
4 Classification of electroheat equipment according to voltage bands
This Clause of part 2 is applicable.
5 Classification of electroheat equipment according to frequency bands
This Clause of part 2 is applicable.
6 General requirements
This Clause of part 2 is applicable.
7 Isolation and switching
This Clause of part 2 is applicable.
8 Connection to the supply network and internal connections
This Clause of part 2 is applicable.
9 Protection against electric shock

This Clause of part 2 applies except as follows:
Addition:
9.2.101 Measures shall be taken in the case of directly or indirectly heated melting
equipment, which provides protection against electric shock when glassmakers’ tools or
extraction machines are submerged in the conductive glass melt, or when the batch mixture is
being fed into the glass melt.
Measures of this type are for example:
– installation of an earthing electrode for personnel safety at the extraction point. The
electrode function shall be constantly monitored. When the monitoring device shows a
reaction, the glass furnace shall automatically be shut down, possibly in partial areas, or
by means of appropriate measures, further extraction shall be prevented;

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60519-21 © IEC:2008 – 7 –


NOTE The earthing electrode should be constructed and set in such a manner that, even under the most

unfavourable circumstances, for example a change in the conduction and filling level of the melt in the region
of the extraction point, effectiveness is not impaired.


• measures against contact with live parts (electrodes, heating elements) by appropriate

construction-design when using glassmakers’ tools, e.g. covers or barriers;

• insulation of the working platform at the place of operation;

In addition, in the case of indirectly heated glass furnaces (pot furnaces):


• automatic shut-off of heating when leakage current measurement indicates a dangerous

situation.

9.2.102 Filling machines, extraction machines and the whole of the steel construction of the

melting plant shall be connected to an equipotential system.
Earthing electrodes for safety of personnel shall be installed in the glass melt and be
connected to the equipotential system.
If an underground equipotential system is installed, the requirements of IEC 60364-4-41 shall
be fulfilled.
10 Protection against overcurrent
This Clause of part 2 is applicable.
11 Equipotential bonding
This Clause of part 2 is applicable.
12 Control circuits and c
...