AS/NZS 61558.2.8:2025
Safety of transformers, reactors, power supply units and combinations thereof – Part 2.8: Particular requirements and tests for transformers and power supply units for bells and chimes
Standard applies to stationary, single-phase, air-cooled (natural or forced) independent or associated dry-type transformers. The windings can be encapsulated or non-encapsulated.
The rated supply voltage does not exceed 250 V AC and the rated supply frequency and the internal operating frequencies do not exceed 500 Hz.
The rated output does not exceed 100 VA.
The no-load output voltage does not exceed 33 V AC or 46 V ripple-free DC, and the rated output voltage does not exceed 24 V AC, or 33 V ripple-free DC.
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.
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AS NZS 61558.2.8 2025
Preface
AUSTRALIAN NATIONAL VARIATIONS
NEW ZEALAND NATIONAL VARIATIONS
Annex ANZ
IEC 61558-2-8
English
CONTENTS
FOREWORD
INTRODUCTION
1 Scope
2 Normative references
3 Terms and definitions
4 General requirements
5 General notes on tests
6 Ratings
7 Classification
8 Marking and other information
9 Protection against electric shock
10 Change of input voltage setting
11 Output voltage and output current under load
12 No-load output voltage
13 Short-circuit voltage
14 Heating
15 Short-circuit and overload protection
16 Mechanical strength
17 Protection against harmful ingress of dust, solid objects and moisture
18 Insulation resistance, dielectric strength and leakage current
19 Construction
20 Components
21 Internal wiring
22 Supply connection and other external flexible cables or cords
23 Terminals for external conductors
24 Provisions for protective earthing
25 Screws and connections
26 Creepage distances, clearances and distances through insulation
27 Resistance to heat, fire and tracking
28 Resistance to rusting
Annexes
Annex F(normative) Requirements for manually operated switches which are parts of transformers assembly
Bibliography
Table 101 – Symbols indicating the kind of transformer
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AS NZS 61558.2.8 2025
Preface
AUSTRALIAN NATIONAL VARIATIONS
NEW ZEALAND NATIONAL VARIATIONS
Annex ANZ
IEC 61558-2-8
English
CONTENTS
FOREWORD
INTRODUCTION
1 Scope
2 Normative references
3 Terms and definitions
4 General requirements
5 General notes on tests
6 Ratings
7 Classification
8 Marking and other information
9 Protection against electric shock
10 Change of input voltage setting
11 Output voltage and output current under load
12 No-load output voltage
13 Short-circuit voltage
14 Heating
15 Short-circuit and overload protection
16 Mechanical strength
17 Protection against harmful ingress of dust, solid objects and moisture
18 Insulation resistance, dielectric strength and leakage current
19 Construction
20 Components
21 Internal wiring
22 Supply connection and other external flexible cables or cords
23 Terminals for external conductors
24 Provisions for protective earthing
25 Screws and connections
26 Creepage distances, clearances and distances through insulation
27 Resistance to heat, fire and tracking
28 Resistance to rusting
Annexes
Annex F(normative) Requirements for manually operated switches which are parts of transformers assembly
Bibliography
Table 101 – Symbols indicating the kind of transformer
AS/NZS 61558.2.8:2025
Online Library subscription information
Online library subscriptions provide a cost-effective solution for organisations of any size to access the latest standards, offering 24/7 access to a personalised catalogue. The service ensures subscribers have have the most up-to-date version of selected standards, incluing automatic updates for any amendments or versions. Pricing is dependent on the chosen standards and the number of concurrent users, with discounts applied from the standards PDF price. For customised subscriptions or further inquiries, contact the Online Library team.