Safety of power transformers, power supply units and similar - Particular requirements for bell and chime transformers (IEC 61558-2-8:1998, IDT)
Standards Australia
<toc>
<bookmarktable>
<bookmark index='0'>
<pageno>1</pageno>
<text>AS/NZS 61558.2.8:2001 SAFETY OF POWER TRANSFORMERS, POWER SUPPLY UNITS AND SIMILAR - PARTICULAR REQUIREMENTS FOR BELL AND ...</text>
<bookmark index='1'>
<pageno>4</pageno>
<text>CONTENTS</text>
</bookmark>
<bookmark index='2'>
<pageno>5</pageno>
<text>PREFACE</text>
</bookmark>
<bookmark index='3'>
<pageno>7</pageno>
<text>1 Scope</text>
</bookmark>
<bookmark index='4'>
<pageno>7</pageno>
<text>2 Normative references</text>
</bookmark>
<bookmark index='5'>
<pageno>8</pageno>
<text>3 Definitions</text>
</bookmark>
<bookmark index='6'>
<pageno>8</pageno>
<text>4 General requirements</text>
</bookmark>
<bookmark index='7'>
<pageno>8</pageno>
<text>5 General notes on tests</text>
</bookmark>
<bookmark index='8'>
<pageno>8</pageno>
<text>6 Ratings</text>
</bookmark>
<bookmark index='9'>
<pageno>9</pageno>
<text>7 Classification</text>
</bookmark>
<bookmark index='10'>
<pageno>9</pageno>
<text>8 Marking and other information</text>
</bookmark>
<bookmark index='11'>
<pageno>10</pageno>
<text>9 Protection against accessibility to hazardous live parts</text>
</bookmark>
<bookmark index='12'>
<pageno>10</pageno>
<text>10 Change of input voltage setting</text>
</bookmark>
<bookmark index='13'>
<pageno>10</pageno>
<text>11 Output voltage and output current under load</text>
</bookmark>
<bookmark index='14'>
<pageno>11</pageno>
<text>12 No-load output voltage</text>
</bookmark>
<bookmark index='15'>
<pageno>11</pageno>
<text>13 Short-circuit voltage</text>
</bookmark>
<bookmark index='16'>
<pageno>11</pageno>
<text>14 Heating</text>
</bookmark>
<bookmark index='17'>
<pageno>12</pageno>
<text>15 Short-circuit and overload protection</text>
</bookmark>
<bookmark index='18'>
<pageno>12</pageno>
<text>16 Mechanical strength</text>
</bookmark>
<bookmark index='19'>
<pageno>12</pageno>
<text>17 Protection against harmful ingress of dust, solid objects and moisture</text>
</bookmark>
<bookmark index='20'>
<pageno>12</pageno>
<text>18 Insulation resistance and dielectric strength</text>
</bookmark>
<bookmark index='21'>
<pageno>12</pageno>
<text>19 Construction</text>
</bookmark>
<bookmark index='22'>
<pageno>14</pageno>
<text>20 Components</text>
</bookmark>
<bookmark index='23'>
<pageno>14</pageno>
<text>21 Internal wiring</text>
</bookmark>
<bookmark index='24'>
<pageno>14</pageno>
<text>22 Supply connections and other external flexible cords</text>
</bookmark>
<bookmark index='25'>
<pageno>14</pageno>
<text>23 Terminals for external conductors</text>
</bookmark>
<bookmark index='26'>
<pageno>15</pageno>
<text>24 Provision for protective earthing</text>
</bookmark>
<bookmark index='27'>
<pageno>15</pageno>
<text>25 Screws and connections</text>
</bookmark>
<bookmark index='28'>
<pageno>15</pageno>
<text>26 Creepage distances, clearances and distances through insulation</text>
</bookmark>
<bookmark index='29'>
<pageno>15</pageno>
<text>27 Resistance to heat, abnormal heat, fire and tracking</text>
</bookmark>
<bookmark index='30'>
<pageno>15</pageno>
<text>28 Resistance to rusting</text>
</bookmark>
<bookmark index='31'>
<pageno>16</pageno>
<text>Annexes</text>
<bookmark index='32'>
<pageno>16</pageno>
<text>Annex C - Material group II</text>
</bookmark>
<bookmark index='33'>
<pageno>16</pageno>
<text>Annex D - Material group I</text>
</bookmark>
</bookmark>
</bookmark>
</bookmarktable>
</toc>
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.
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.
| Document Type | Standard |
| Status | Current |
| Publisher | Standards Australia |
| Committee | EL-002 |
| Under Revision |
|
| Supersedes |
|
| Superseded By |
|
