Requirements for Low-Voltage Complete Sets of Equipment

Low-voltage complete sets of equipment must comply with the EU Low Voltage Directive (2014/35/EU) and relevant IEC standards, including IEC 62368-1, with additional guidance from SIST HD 60364 for overcurrent protection and prosumer installations.

Regulatory Framework

The Low Voltage Directive (LVD 2014/35/EU) applies to electrical equipment with AC voltages between 50V and 1000V and DC voltages between 75V and 1500V. It sets essential safety requirements to protect users from electrical hazards, including electric shock, fire, and mechanical risks. Compliance with the LVD is demonstrated by affixing the CE marking on the product, which indicates conformity with EU safety standards and harmonized technical specifications (Power-Sonic) .

Key Standards

• IEC 62368-1: This standard supersedes IEC 60950-1 (ICT equipment) and IEC 60065 (AV equipment) and introduces hazard-based safety engineering principles. It covers audio-visual, information, and communication technology equipment, ensuring protection against electrical, thermal, and mechanical hazards (Power-Sonic) .
• SIST HD 60364-4-43:2023/oprAA:2025: Focuses on overcurrent protection in low-voltage installations. It specifies techniques for protecting live conductors, automatic disconnection of supply in case of overload or short-circuit, and proper placement of protective devices, including neutral conductor protection in harmonics-prone environments (ITEH) .
• SIST HD 60364-8-2:2019/A12:2021: Provides guidance for prosumer installations, where buildings both consume and generate electricity, ensuring safe integration of distributed energy resources (ITEH) .

Technical Requirements

• Voltage and Current Ratings: Equipment must be rated according to standard nominal system voltages defined in IEC 60038 and tested for withstand voltages as per IEC 60060 (ITER Electrical Design Handbook) .
• Overcurrent Protection: Protective devices must be installed at the origin of each circuit, with automatic disconnection as the preferred measure. Special attention is required for systems with neutral conductors exposed to harmonics (ITEH) .
• Safety Principles: Equipment design must consider insulation, separation of circuits, grounding, and protection against fire and mechanical hazards. Hazard-based engineering principles from IEC 62368-1 guide the design and testing process (Power-Sonic) .

Compliance and Implementation

Manufacturers and system designers must:

1. Design and test equipment against harmonized standards.
2. Document conformity with the LVD and relevant IEC standards.
3. Affix CE marking to indicate compliance.
4. Review legacy equipment previously certified under IEC 60950-1 or IEC 60065 to ensure it meets IEC 62368-1 requirements (Power-Sonic) .
5. Follow national transpositions of the LVD and guidance from the European Commission's Blue Guide for placing products on the market (EC) .

Summary

Low-voltage complete sets of equipment must meet voltage-specific safety requirements, incorporate overcurrent protection, and comply with harmonized IEC standards. Compliance ensures user safety, legal conformity in the EU, and proper integration of modern electrical systems, including prosumer and distributed energy setups. Proper documentation, testing, and CE marking are essential for market placement and regulatory adherence.