Safety of power transformers, power supplies, reactors and similar products - General requirements and tests

BS EN 61558-1:2005 + A1:2009 Safety of power transformers, power supplies, reactors and similar products. General requirements and tests

BS EN 61558-1 deals with safety aspects of power transformers, power supplies, reactors and similar products such as electrical, thermal and mechanical safety. This standard covers the various types of dry-type transformers, power supplies, including switch mode power supplies, and reactors, the windings of which may be encapsulated or non-encapsulated .

BS EN 61558-1 also applies to transformers, power supplies, switch mode power supplies, and reactors 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 transformers, power supplies and switch mode power supplies, and reactors.

Contents of BS EN 61558-1:

Introduction

Scope

Normative references

Classification

Marking and other information

Protection against electric shock

Change of input voltage setting

Output voltage and output current under load

No-load output voltage

Short-circuit voltage

Heating

Short circuit and overload protection

Mechanical strength

Protection against harmful ingress of dust, solid objects and moisture

Insulation resistance, dielectric strength and leakage current

Construction

Components

Internal wiring

Supply connection and other external flexible cables or cords

Terminals for external conductors

Provisions for protective earthing

Screws and connections

Creepage distances, clearances and distances through insulation

Resistance to heat, fire and tracking

Resistance to rusting

Measurement of creepage distances and clearances

Testing a series of transformers

Creepage distances (cr), clearances (cl) and distances through insulation (dti) Material group II (400 ≤CTI <600)

Creepage distances (cr), clearances (cl) and distances through insulation (dti) Material group I (CTI ≥600)

Glow-wire test

Requirements for manually operated switches which are parts of transformers assembly

Tracking test

Electronic circuits

Measuring network for touch-currents

Insulated winding wires for use as multiple layer insulation

Routine tests (production tests)

Examples to be used as a guide for 19.1

Examples of points of application of test voltages

Examples of points of measurement of creepage distances and clearances

Explanation of IP numbers for degrees of protection

Explanations of the application of 4.1.1.2.1 of IEC 60664-1

Optional tw–marking of transformers

Symbols to be used for thermal cut-outs

Coated printed circuit boards

Normative references to international publications with their corresponding European publications