IEC 60335-2-96:2019

Overview

IEC 60335-2-96:2019 is the IEC safety standard for flexible sheet heating elements for room heating intended to be incorporated into building fabric (floors, walls and ceilings). It specifies particular requirements that supplement IEC 60335-1 and applies to heating elements with rated voltages up to 250 V (single‑phase) and 480 V (other installations). This edition (2.0, 2019) supersedes the 2002 edition and incorporates technical revisions and corrigendum 1 (2025‑10).

Key topics and technical requirements

• Scope and exclusions
  • Applies to flexible sheet heating elements installed in floors and walls (below 1.2 m and above 2.3 m) and ceilings.
  • Excludes industrial heating, appliances for corrosive/explosive atmospheres, vehicle/ship/aircraft installations (which may need extra rules), and other appliance-specific heating items (see IEC 60335‑2‑17, IEC 60335‑2‑81, IEC 60335‑2‑106).
• Safety and construction requirements
  • Integration with IEC 60335‑1: treatment of general safety clauses and adaptations specific to sheet heating elements.
  • Requirements for marking, instructions, insulation, earthing, internal wiring, terminals, and components.
• Performance and test requirements
  • Tests for electrical strength, leakage current, transient overvoltages, moisture resistance, mechanical strength, endurance, abnormal operation and resistance to heat and fire.
  • Specific test arrangements and temperature‑rise limits (tables and figures provided) for installations in timber, concrete and modular construction.
• Recent technical changes
  • Alignment with IEC 60335‑1:2010 and its amendments.
  • Conversion of several notes into normative requirements.
  • Modified strength test for heating units with insulated wires for floor installation.
  • New requirements for heating units installed in walls below 1.2 m and an Annex (AA) summarizing installation instructions.

Practical applications

• Use this standard to design, test, certify and install in‑floor, in‑wall and ceiling embedded sheet heating systems used in residential and similar buildings.
• Helps manufacturers produce compliant heating units and informs product documentation, installation instructions and safety labeling.
• Used by testing laboratories and certification bodies for conformity assessment and by building authorities, electrical installers and specifiers to verify safe integration into construction.

Who should use this standard

• Manufacturers of flexible sheet heating elements and integrated heating units
• Test laboratories and conformity assessment bodies
• Electrical contractors, installers and building services engineers
• Regulatory and building authorities, product safety engineers

Related standards

• IEC 60335‑1 (general requirements for household electrical appliance safety)
• IEC 60335‑2‑17, IEC 60335‑2‑81, IEC 60335‑2‑106 (other heating appliance parts)
• National wiring and building regulations (may impose additional requirements)

Keywords: IEC 60335-2-96, flexible sheet heating elements, underfloor heating, heating unit safety, electrical appliance safety, IEC 60335-1, installation instructions, testing and certification.