IEC 60763-1:2010

Overview

IEC 60763-1:2010 sets out the definitions, classification, and general requirements for laminated pressboard used in electrical applications. Published by the International Electrotechnical Commission (IEC), this standard is a key reference for manufacturers, suppliers, and users of solid electrical insulating materials. It applies to all types of laminated pressboard, providing a basis for understanding insulation material properties, material selection, and safe application in electrical equipment.

This second edition brings IEC 60763-1 in line with IEC 60641-1:2007, ensuring harmonization within insulation standards for electrical equipment. By defining the required terminology, categorizing materials, and specifying general criteria, it supports both product quality and compatibility in the international electrical industry.

Key Topics

Definitions
IEC 60763-1 provides foundational definitions, including:

• Pressboard: Rigid board made from vegetable-origin pulp, known for its density, uniform thickness, mechanical strength, and excellent insulating properties.
• Laminated pressboard: Board constructed from multiple pressboard sheets bonded with adhesive, offering enhanced performance characteristics.

Material Classification
The standard classifies laminated pressboard into a set of types based on:

• Composition (e.g., wood pulp, cotton, blends)
• Physical and chemical properties
• Intended applications (e.g., high purity, oil absorption, machinability)

Examples of classification include types designated as LB0, LB2, LB3, LB4, LB5, and LB6, with subdivisions specifying fiber content and usage recommendations.

General Requirements
Key requirements specified by IEC 60763-1 for laminated pressboard include:

• Compliance with IEC 60641-1 for component sheets
• Standardized bonding and manufacturing processes
• Machinability appropriate to the material
• Preferred sheet thicknesses (10–50 mm) with specified tolerances
• Detailed labeling and protective packaging for transport and storage

Applications

Laminated pressboard products conforming to IEC 60763-1 are widely used in electrical and electronic sectors where solid electrical insulation is critical. Common applications include:

• Power transformers: Used for coil supports, spacers, lead exit insulation, and barriers, taking advantage of pressboard’s dielectric strength and oil compatibility.
• Motors and generators: Deployed in slot wedges, phase insulation, and structural support components.
• Switchgear and electrical equipment: Utilized as mechanical and electrical barriers due to their rigidity, machinability, and aging resistance.
• Oil-immersed equipment: Types with high oil absorption and moldability are essential for components requiring shaping and long-term exposure to insulating oils.

Selection of laminated pressboard type should always be matched to the specific performance requirements of the end-use application, considering mechanical strength, purity, aging, and processing needs.

Related Standards

Professionals working with laminated pressboard and insulating materials should also reference these related IEC standards:

• IEC 60641-1: Pressboard and presspaper for electrical purposes - Part 1: Definitions and general requirements (closely aligned with IEC 60763-1)
• IEC 60763-2 & IEC 60763-3: Additional parts covering test methods and specific requirements for laminated pressboard
• IEC 60112, IEC 60216: Standards covering thermal and electrical characteristics for insulation
• IEC 60243: Methods for determining dielectric strength in insulating materials

For the latest updates and full specifications, consult the IEC webstore. Following these recognized IEC standards promotes international consistency and product reliability in the electrical insulation industry.