IEC 62109-1:2010

Overview

IEC 62109-1:2010 - Safety of power converters for use in photovoltaic power systems (Part 1: General requirements) defines the minimum safety requirements for power conversion equipment (PCE) used in photovoltaic (PV) systems. It establishes a uniform technical baseline for the design, manufacture and testing of PV inverters, converters and related equipment to protect against electric shock, energy, fire, mechanical and other hazards.

Keywords: IEC 62109-1, PV power converters safety, photovoltaic inverters safety standard, power conversion equipment, electrical safety.

Key topics and technical requirements

IEC 62109-1 provides general, practical requirements that apply across PV PCE types. Major topics include:

• Scope and object - which PCE are included and which aspects are excluded.
• General testing requirements - test sequences, reference conditions, thermal testing, and single-fault testing.
• Electrical safety tests - impulse voltage, dielectric (voltage) tests, partial discharge and touch-current measurements.
• Protection against electric shock and energy hazards - decisive voltage classifications, protective separation, insulation, clearance & creepage, and RCD/RCM compatibility.
• Backfeed and fault conditions - tests and pass/fail criteria for backfeed under normal and single-fault states.
• Marking and documentation - mandatory identification, ratings, warning markings and installation/maintenance instructions.
• Environmental and physical requirements - ingress protection, pollution degree, UV exposure, temperature/humidity categories, mechanical stability, lifting/installation provisions.
• Fire, mechanical, sonic, liquid and chemical hazards - material selection, fire enclosures, limited power source testing, moving parts protection, liquid containment and chemical safety.
• Physical construction - wiring, terminals, connectors, openings, polymeric materials and enclosure requirements.

Practical applications and users

IEC 62109-1 is intended for stakeholders involved in PV equipment safety and compliance:

• Manufacturers and designers of PV inverters, converters and PCE - to guide safe design and component selection.
• Test laboratories and certification bodies - to perform type and routine testing against standardized criteria.
• System integrators and installers - for installation instructions, marking and compatibility guidance.
• Regulators and procurement teams - to specify minimum safety requirements in tenders and approvals.
• Maintenance personnel - for safe service procedures and understanding single-fault behaviours.

Related standards

• IEC 62109-2 (specific requirements for particular PCE types) - complements Part 1 by addressing detailed/variant-specific criteria.
• Other IEC electrical safety and PV standards may be referenced for system-level compliance.

IEC 62109-1 is essential for achieving consistent, verifiable safety in photovoltaic power conversion equipment and for demonstrating compliance with international PV safety best practices.