IEC 61347-2-2:2011

Overview

IEC 61347-2-2:2011 is an international standard published by the International Electrotechnical Commission (IEC) under the title Lamp controlgear – Part 2-2: Particular requirements for d.c. or a.c. supplied electronic step-down convertors for filament lamps. This standard sets out the specific safety requirements for electronic step-down convertors, also known as electronic transformers, used in powering filament lamps such as tungsten-halogen lamps. It applies to convertors operating on direct current (d.c.) supplies up to 250 V or alternating current (a.c.) supplies up to 1,000 V, and with rated output voltages up to 50 V r.m.s. (for a.c.) or 120 V ripple-free d.c., making it highly relevant to low-voltage lighting systems for residential, commercial, and industrial environments.

This second edition replaces earlier versions and amendments, with significant changes largely related to safety extra-low voltage (SELV) requirements. It should be read in conjunction with IEC 61347-1:2007, the general standard for lamp controlgear.

Key Topics

• Scope and Applicability: Applies to electronic step-down convertors for filament lamps associated with low-voltage tungsten-halogen lamps and other filament types.
• Safety Requirements: Covers requirements for protection against electric shock, insulation, moisture resistance, and fault conditions.
• Performance and Marking: Specifies mandatory labeling, information provision, and performance criteria for step-down convertors.
• Classification: Distinguishes between different protection types, including auto-wound, separating, and SELV convertors.
• Testing Procedures: Outlines necessary laboratory testing for compliance, including fault conditions, transformer heating, and resistance to environmental factors.
• Normative References: Refers to key standards such as IEC 60357 (tungsten-halogen lamps), IEC 61047 (performance requirements of step-down convertors), and several transformer and protective standards under IEC 61558.

Applications

IEC 61347-2-2:2011 is applicable across a broad range of lighting control systems utilizing filament lamps, with particular focus on:

• Residential Lighting: Ensuring the safety of electronic transformers used in downlights, spotlights, and decorative halogen lamps.
• Commercial and Retail Spaces: Reliable operation and safety compliance of low-voltage lighting installations in offices, shops, and displays.
• Industrial Installations: Step-down convertors in specialized lighting systems demanding robust protection and compliance with international safety norms.
• Luminaire Manufacturers: Provides a framework for designing and testing electronic controlgear integrated into or supplied with luminaires.
• Certification and Compliance: Essential for testing laboratories and certification bodies assessing products for market entry or regulatory approval.

By adhering to the requirements of IEC 61347-2-2, manufacturers and installers can safeguard against risks such as electric shock, overheating, and fire hazards associated with electronic step-down convertors in low-voltage lighting systems.

Related Standards

When implementing or certifying according to IEC 61347-2-2:2011, attention should be given to the following related standards:

• IEC 61347-1: Lamp controlgear - Part 1: General and safety requirements (Base standard for all lamp controlgear).
• IEC 60357: Tungsten halogen lamps (Non-vehicle) - Performance specifications.
• IEC 61047: DC or a.c. supplied electronic step-down convertors for filament lamps - Performance requirements.
• IEC 61558 Series: Various parts covering safety of transformers, including:
  • IEC 61558-2-1: Separating transformers and power supplies for general applications.
  • IEC 61558-2-6: Safety isolating transformers.
  • IEC 61558-2-13: Auto transformers and power supply units.
  • IEC 61558-2-16: Switch mode power supply units.

In summary, IEC 61347-2-2:2011 delivers critical requirements for the safety and operational integrity of electronic step-down convertors used in filament lamp applications, supporting increased safety and reliability for modern low-voltage lighting installations worldwide.