IEC 60364-7-712:2017

Overview

IEC 60364-7-712:2017 - Low voltage electrical installations - Part 7-712: Requirements for special installations or locations - Solar photovoltaic (PV) power supply systems - is the 2017 (Edition 2.0) IEC standard that specifies requirements for the electrical installation of PV systems supplying all or part of a building’s installation. It addresses selection and application of PV equipment in the context of low-voltage installations and incorporates experience and technological developments since the first edition.

Key Topics and Technical Requirements

This standard covers the practical and safety-related aspects of PV installations, including:

• Scope and system assessment
  • Definition of PV installation types, distribution system configurations and general functional arrangements (arrays, strings, subarrays, PCEs - power conversion equipment).
• Protection for safety
  • Measures against electric shock (including double/reinforced insulation, SELV/PELV and fault-protection strategies).
  • Protection against thermal effects and fire risks from electrical equipment.
  • Overcurrent protection: selection and coordination of overload and short‑circuit protective devices on DC and AC sides.
  • Protection against voltage disturbances and electromagnetic interference, including transient overvoltages and lightning-related considerations.
• Selection and erection of equipment
  • Requirements for wiring systems, conductor sizing, current-carrying capacity, voltage drop, routing, and fire-minimizing practices.
  • Isolation, switching and control devices for disconnecting PV arrays, including functional earthing arrangements and device response times.
  • Identification, marking and prevention of mutual detrimental influence between PV equipment and other services.
• Earthing, protective conductors and bonding
  • Guidance on earthing arrangements for different PV functional configurations and PCE isolation.
• Inspection, testing and documentation
  • Requirements for commissioning, periodic testing, insulation resistance monitoring and required installation information.
• Informative and normative annexes
  • Practical tools and examples: calculation methods for voltages/currents, signs/labels, blocking diode behavior, arc fault detection and country-specific notes.

Practical Applications and Users

IEC 60364-7-712 is used by:

• PV system designers and electrical engineers to ensure safe, code-compliant system architecture.
• Installers and contractors for correct wiring, protection and earthing practice on rooftop, façade and ground-mounted PV systems.
• Manufacturers of inverters, combiner boxes and PV-related electrical equipment for device selection and compliance.
• Inspectors, testing laboratories, certification bodies and building owners for commissioning, maintenance and safety verification.

Typical applications: residential and commercial rooftop PV, building-integrated PV, battery-coupled systems, grid-connected and off-grid low-voltage PV installations.

Related Standards (if applicable)

• Other parts of the IEC 60364 series (low-voltage installations)
• National electrical codes and local building regulations
• IEC standards relevant to PV modules, inverters and balance-of-system equipment (consult normative references in 60364‑7‑712 for specifics)

Keywords: IEC 60364-7-712, PV systems, solar photovoltaic, low voltage electrical installations, protection against electric shock, earthing, wiring systems, arc fault detection, PCE.