IEC 60371-1 pdf download Specification for insulating materials based on mica – Part 1: Definitions and general requirements
This part of lEC 60371 gives definitions of terms used to describe built-up mica materials,products based on them and mica paper. It also deals with general requirements andconditions of supply.
The following referenced documents are indispensable for the application of this document.For dated references, only the edition cited applies. For undated references, the latest editionof the referenced document (including any amendments) applies.
IEC 60050(212):1990,International Electrotechnical Vocabulary (IEV)- Chapter 212:lnsulating solids，liquids and gases
IEC 60371-3 (all parts), Specification for insulating materials based on mica- Part 3:Specifications for individual materials
3 Terms and definitions
For the purposes of this document, the definitions in IEC 60050(212) together with thefollowing definitions apply.
mineral belonging to the sheet silicates
NOTE The two main types used for electrical purposes are
a)muscovite (potassium alumino-silicate),
b)phlogopite (potassium magnesium alumino-silicate).
laminae split from mica blocks
paper-like material consisting entirely of very small flakes of mica without any binder
one or more layers of mica splittings or mica paper bonded together with a suitable binderwith or without reinforcement
4Description of material
4.1 Rigid flat mica material or mica paper
Built-up mica, bonded under pressure, with or without external heat, in the form of rigid flatpieces.
4.1.1 Rigid material for commutator separatorsRigid mica material ground on one or both surfaces.
NOTE Commutator separators are the insulation between commutator segments.
4.1.2Rigid material for heating equipment
Rigid mica material capable of operating at the specified temperature, not usually ground.
4.1.3Rigid material, heat formable
Rigid mica material which can be formed and moulded when heated, not usually ground.
4.2Flexible mica material
Built-up mica usually consists of mica paper with a suitable binder with or without
reinforcement which is sufficiently flexible to permit winding or wrapping into place, with orwithout heat.The flexibility may or may not be maintained after application.
4.2.1 Flexible mica material impregnated with B stage resin
Flexible mica material with a binder suitable for final cure after application.
4.2.2Flexible mica material, porous for post-impregnation
Flexible mica material containing a small amount of binder used in conjunction with vacuumpressure impregnation(VPl) with compatible impregnants.
4.2.3 Flexible mica material for fire security cables
Flexible mica material with a suitable binder designed for use in cables capable of operatingafter fire.
5 General requirements and conditions of supply
See the appropriate sheets of lEC 60371-3.