IEC 61558-2-2:2022 PDF

Safety of transformers, reactors, power supply units and combinations thereof - Part 2-2: Particular requirements and tests for control transformers and power supply units incorporating control transformers

First page of standard IEC 61558-2-2:2022

Open preview (PDF)

Title (English):

IEC 61558-2-2:2022

Document status:: Active
Format:: Electronic (PDF)
Number of pages:: 53
Publication date:: October 19, 2022
Edition:: IEC IS 61558 edition 3 version 1
ICS:: 29.180

Delivery type:

Full version35 €Read online 24h10 €Read online 72h15 €

Document language:

enru

Delivery time:Immediate download

Price:35 €

Description (English):

IEC 61558-2-2:2022 deals with the safety of control transformers and power supply units incorporating control transformers. Transformers incorporating electronic circuits are also covered by this document. This third edition cancels and replaces the second edition published in 2007. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition: - adjustment of structure and references in accordance with IEC 61558-1:2017; - new general symbol for control transformers; - new symbol for power supply unit with linearly regulated output voltage. It has the status of a group safety publication in accordance with IEC Guide 104.

Technical details

Technical committee: TC 96 - Transformers and reactors
SKU: IEC 61558-2-2:2022

Abstract

Overview

IEC 61558-2-2:2022 - "Safety of transformers, reactors, power supply units and combinations thereof - Part 2-2" - defines particular safety requirements and tests for control transformers and power supply units incorporating control transformers. This third edition (2022) replaces the 2007 edition, constitutes a technical revision and is published as a group safety publication (IEC Guide 104). It applies mainly to dry-type, air-cooled control transformers (including those with electronic circuits) used for control and safety extra-low-voltage (SELV) applications.

Key topics and requirements

The standard supplements IEC 61558-1:2017 and covers practical safety and test topics, including:

Scope and classification - applicability to stationary/portable, single- or poly-phase devices; dry-type constructions; limits on voltages and frequencies.
Rated limits - rated supply voltage ≤ 1 000 V AC and rated/internal frequency ≤ 500 Hz; no‑load or rated output voltage ≤ 1 000 V AC (or 1 415 V ripple‑free DC). Typical rated thermal output limits: 25 kVA (single-phase) and 40 kVA (polyphase), unless otherwise agreed.
Electrical safety - protection against electric shock, insulation, creepage/clearance distances, dielectric strength, leakage current.
Performance tests - output voltage/current under load, no-load voltage, short‑circuit voltage, short‑circuit and overload protection.
Thermal and mechanical tests - heating, mechanical strength, resistance to fire/tracking and rusting.
Construction and components - internal wiring, terminals, earthing provisions, components selection and marking.
Ingress protection - protection against dust, solid objects and moisture.
Specific symbols and markings - introduction of a new general symbol for control transformers and a new symbol for power supplies with linearly regulated outputs.
Coordination with switch‑mode supplies - linear power supply units are covered here; switch‑mode power supplies are addressed by IEC 61558-2-16 in conjunction with this part - where requirements conflict, the more stringent applies.

Applications and who uses this standard

IEC 61558-2-2:2022 is used by:

Transformer and power-supply manufacturers designing and marking control transformers and linear control PSUs.
Product design and safety engineers ensuring compliance with electrical, thermal and mechanical safety requirements.
Test laboratories and certification bodies performing safety and type tests.
Procurement and compliance teams specifying safe control transformers for industrial control panels, machine tools, building automation, and SELV control circuits.
Electrical installers and maintenance teams referencing safe limits and markings.

Related standards

IEC 61558-1:2017 (general requirements)
IEC 61558-2-16 (switch‑mode power supplies)
IEC 60076-11 (other transformer types - excluded)
SELV and control-circuit references: IEC 61140, IEC 60364-4-41, IEC 60204-1

This standard is essential for ensuring the safety, marking, testing and correct selection of control transformers and associated power supply units in industrial and control applications.

Related standards

Standards mentioned in the description

Abstract

Overview

Key topics and requirements

The standard supplements IEC 61558-1:2017 and covers practical safety and test topics, including:

Scope and classification - applicability to stationary/portable, single- or poly-phase devices; dry-type constructions; limits on voltages and frequencies.
Rated limits - rated supply voltage ≤ 1 000 V AC and rated/internal frequency ≤ 500 Hz; no‑load or rated output voltage ≤ 1 000 V AC (or 1 415 V ripple‑free DC). Typical rated thermal output limits: 25 kVA (single-phase) and 40 kVA (polyphase), unless otherwise agreed.
Electrical safety - protection against electric shock, insulation, creepage/clearance distances, dielectric strength, leakage current.
Performance tests - output voltage/current under load, no-load voltage, short‑circuit voltage, short‑circuit and overload protection.
Thermal and mechanical tests - heating, mechanical strength, resistance to fire/tracking and rusting.
Construction and components - internal wiring, terminals, earthing provisions, components selection and marking.
Ingress protection - protection against dust, solid objects and moisture.
Specific symbols and markings - introduction of a new general symbol for control transformers and a new symbol for power supplies with linearly regulated outputs.
Coordination with switch‑mode supplies - linear power supply units are covered here; switch‑mode power supplies are addressed by IEC 61558-2-16 in conjunction with this part - where requirements conflict, the more stringent applies.

Applications and who uses this standard

IEC 61558-2-2:2022 is used by:

Transformer and power-supply manufacturers designing and marking control transformers and linear control PSUs.
Product design and safety engineers ensuring compliance with electrical, thermal and mechanical safety requirements.
Test laboratories and certification bodies performing safety and type tests.
Procurement and compliance teams specifying safe control transformers for industrial control panels, machine tools, building automation, and SELV control circuits.
Electrical installers and maintenance teams referencing safe limits and markings.

Related standards

IEC 61558-1:2017 (general requirements)
IEC 61558-2-16 (switch‑mode power supplies)
IEC 60076-11 (other transformer types - excluded)
SELV and control-circuit references: IEC 61140, IEC 60364-4-41, IEC 60204-1

This standard is essential for ensuring the safety, marking, testing and correct selection of control transformers and associated power supply units in industrial and control applications.

IEC 61558-2-2:2022 PDF

Technical details

Abstract

Overview

Key topics and requirements

Applications and who uses this standard

Related standards

Related standards

Abstract

Overview

Key topics and requirements

Applications and who uses this standard

Related standards

Related standards

Safety of transformers, reactors, power supply units and combinations thereof - Part 1: General requirements…

Corrigendum 1 - Safety of transformers, reactors, power supply units and combinations thereof - Part 2-16: Pa…

Power transformers - Part 11: Dry-type transformers

Protection against electric shock - Common aspects for installation and equipment

Low-voltage electrical installations - Part 4-41: Protection for safety - Protection against electric shock

Safety of machinery - Electrical equipment of machines - Part 11: Requirements for equipment for voltages abo…