Table of Contents

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<text>AS/NZS 61558.2.8:2001 SAFETY OF POWER TRANSFORMERS, POWER SUPPLY UNITS AND SIMILAR - PARTICULAR REQUIREMENTS FOR BELL AND ...</text>
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<pageno>4</pageno>
<text>CONTENTS</text>
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<pageno>5</pageno>
<text>PREFACE</text>
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<pageno>7</pageno>
<text>1 Scope</text>
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<pageno>7</pageno>
<text>2 Normative references</text>
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<pageno>8</pageno>
<text>3 Definitions</text>
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<pageno>8</pageno>
<text>4 General requirements</text>
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<pageno>8</pageno>
<text>5 General notes on tests</text>
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<pageno>8</pageno>
<text>6 Ratings</text>
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<pageno>9</pageno>
<text>7 Classification</text>
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<pageno>9</pageno>
<text>8 Marking and other information</text>
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<pageno>10</pageno>
<text>9 Protection against accessibility to hazardous live parts</text>
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<pageno>10</pageno>
<text>10 Change of input voltage setting</text>
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<pageno>10</pageno>
<text>11 Output voltage and output current under load</text>
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<pageno>11</pageno>
<text>12 No-load output voltage</text>
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<pageno>11</pageno>
<text>13 Short-circuit voltage</text>
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<pageno>11</pageno>
<text>14 Heating</text>
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<pageno>12</pageno>
<text>15 Short-circuit and overload protection</text>
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<pageno>12</pageno>
<text>16 Mechanical strength</text>
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<pageno>12</pageno>
<text>17 Protection against harmful ingress of dust, solid objects and moisture</text>
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<pageno>12</pageno>
<text>18 Insulation resistance and dielectric strength</text>
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<pageno>12</pageno>
<text>19 Construction</text>
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<pageno>14</pageno>
<text>20 Components</text>
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<pageno>14</pageno>
<text>21 Internal wiring</text>
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<pageno>14</pageno>
<text>22 Supply connections and other external flexible cords</text>
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<pageno>14</pageno>
<text>23 Terminals for external conductors</text>
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<pageno>15</pageno>
<text>24 Provision for protective earthing</text>
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<pageno>15</pageno>
<text>25 Screws and connections</text>
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<pageno>15</pageno>
<text>26 Creepage distances, clearances and distances through insulation</text>
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<pageno>15</pageno>
<text>27 Resistance to heat, abnormal heat, fire and tracking</text>
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<pageno>15</pageno>
<text>28 Resistance to rusting</text>
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<pageno>16</pageno>
<text>Annexes</text>
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<pageno>16</pageno>
<text>Annex C - Material group II</text>
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<pageno>16</pageno>
<text>Annex D - Material group I</text>
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Abstract

Specifies general safety requirements for approval and test purposes for bell and chime transformers. This Standard is an adotpion with national modifications and contains the full text of IEC 61558-2-8:1998.

Scope

Replacement:
This international standard deals with all aspects of safety such as electrical, thermal and mechanical.
This part 2-8 of IEC 61558 AS/NZS 61558 applies to fixed, single-phase, air-cooled (natural or forced), independent or associated safety isolating transformers for bell and chimes, having a rated supply voltage not exceeding 250 V a.c., a rated frequency not exceeding 500 Hz, a rated output not exceeding 100 VA.
The no-load output voltage shall not exceed 33 V a.c. or 46 V ripple free d.c. and the rated output voltage shall not exceed 24 V a.c. or 33 V ripple free d.c.
Bell and chime transformers are generally intended to supply domestic sound signalling equipment and other similar devices where the load is applied for short periods of time.
NOTE 1 A partial load may be applied for illumination purposes.
This standard applies to special safety isolating transformers (transformer for bell and chime) which are used where double or reinforced insulation between circuits is required by the installation rules or by the appliance specification.
This standard is applicable to dry-type transformers. The windings may be encapsulated or non-encapsulated.
NOTE 2 Attention is drawn to the fact that for transformers intended to be used in tropical countries special requirements may be necessary.
NOTE 2. for the purposes of this standard, Australia and New Zealand are not considered to be tropical;
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 10919 CP
Supersedes	AS/NZS 3108:1994 DR 01945 CP
Superseded By	AS/NZS 61558.2.8:2011 AS/NZS 61558.2.8:2011 AS/NZS 61558.2.8:2011 (IEC TEXT)