Table of Contents

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<text>AS/NZS 61558.2.23:2001 SAFETY OF POWER TRANSFORMERS, POWER SUPPLY UNITS AND SIMILAR DEVICES - PARTICULAR REQUIREMENTS FOR ...</text>
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<text>CONTENTS</text>
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<pageno>7</pageno>
<text>PREFACE</text>
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<text>1 Scope</text>
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<text>2 Normative references</text>
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<text>3 Definitions</text>
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<text>4 General requirements</text>
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<pageno>10</pageno>
<text>5 General notes on tests</text>
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<text>6 Ratings</text>
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<text>7 Classification</text>
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<text>8 Marking and other information</text>
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<text>9 Protection against accessibility to hazardous live parts</text>
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<text>10 Change of input voltage setting</text>
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<text>11 Output voltage and output current under load</text>
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<text>12 No-load output voltage</text>
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<pageno>16</pageno>
<text>13 Short-circuit voltage</text>
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<text>14 Heating</text>
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<text>15 Short-circuit and overload protection</text>
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<text>16 Mechanical strength</text>
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<text>17 Protection against harmful ingress of dust, solid objects and moisture</text>
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<pageno>18</pageno>
<text>18 Insulation resistance and electric strength</text>
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<pageno>18</pageno>
<text>19 Construction</text>
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<pageno>21</pageno>
<text>20 Components</text>
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<text>21 Internal wiring</text>
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<text>22 Supply connection and other external flexible cables or cords</text>
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<pageno>21</pageno>
<text>23 Terminals for external conductors</text>
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<pageno>21</pageno>
<text>24 Provision for protective earthing</text>
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<pageno>21</pageno>
<text>25 Screws and connections</text>
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<pageno>21</pageno>
<text>26 Creepage distances, clearances and distances through insulation</text>
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<pageno>21</pageno>
<text>27 Resistance to heat, abnormal heat, fire and tracking</text>
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<pageno>21</pageno>
<text>28 Resistance to rusting</text>
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Abstract

Specifies general safety requirements for approval and test purposes for transformers for construction sites. This Standard is an adoption with national modifications and contains the full text of IEC 61558-2-23:2000.

Scope

Replacement:
This International Standard deals with all aspects of safety such as electrical, thermal and mechanical.
This part of IEC 61558 AS/NZS 61558 applies to stationary or portable single-phase or poly-phase air-cooled (natural or forced) independent or associated, isolating or safety isolating transformers intended for use on construction sites, having a rated supply voltage not exceeding 1 000 V a.c., and a rated frequency not exceeding 500 Hz.
The rated output should not exceed:
25 kVA for single-phase transformers;
40 kVA for poly-phase transformers.
Isolating transformers for construction sites should have a no-load output voltage and a rated output voltage exceeding 50 V a.c. and not exceeding 250 V a.c.
Safety isolating transformers for construction sites should have a no-load output voltage and a rated output voltage not exceeding 50 V a.c.
NOTE This standard is applicable to transformers for the supply of electricity in locations as specified in IEC 60364-7-704. The latter also specifies the protection by using an earthed midpoint or starpoint of the output winding.
Transformers for construction sites are to be used when required by the installation rules or by the appliance specification for protection purposes.
When the transformers are incorporated into low-voltage switchgear and controlgear assemblies for construction sites as specified in IEC 60439-4, the additional requirements of IEC 60439-4 will apply to the assembly.
This standard is applicable to dry-type transformers. The windings may be encapsulated or non-encapsulated.
NOTE 1 For transformers filled with liquid dielectric or pulverized material, such as sand, additional requirements are under consideration.
NOTE 2 Attention is drawn to the fact that
for transformers intended to be used in tropical countries, special requirements may be necessary;
for the purposes of this standard, Australia and New Zealand are not considered to be tropical;
in locations where special environmental conditions prevail, particular requirements may be necessary.
This standard also applies to transformers incorporating electronic circuits. This standard does not apply to external circuits and their components intended to be connected to the input and output terminals or socket-outlets of the transformer.

General Product Information

Published
Document Type	Standard
Status	Current
Publisher	Standards Australia
Pages
ISBN
Committee	EL-002
Under Revision	DR 10921 CP
Supersedes	AS/NZS 3108:1994 DR 01948 CP
Superseded By	AS/NZS 61558.2.23:2011 (IEC TEXT) AS/NZS 61558.2.23:2011 AS/NZS 61558.2.23:2011