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
