IEC 60674-1:1980 pdf download.Specification for plastic films for electrical purposes – Part 1: Definitions and general requirements.
INTRODUCTION
This standard is one of a series which deals with plastic films for electrical purposes.
The series will consist of three parts:
Part 1 Definitions and general requirements
Part 2: Methods of test ( Publication 674-2)
Part 3: Specifications for individual materials(Publication 674-3)
1. Scope
This standard is applicable to plastic films used for electrical purposes This Part I gives definitions for, and specifies general requirements to be fulfilled by, plastic films used for electrical purposes.
3. General requirements
3.1 Quality
All material in any one consignment shall be consistent. The properties of the film shall be within
ne limits of this standard throughout the whole length of each roll. The surface shall be uniform and the film shall be substantially free from defects such as creases, tears, gas bubbles, pinholes, inclusions of foreign matter.
3.2 Rolls
The outside diameter of each roll shall be within the range agreed between the purchaser and supplier. The rolls shall be essentially circular and shall be wound sufficiently tightly to avoid tele- scoping during transit and subsequent normal use.
Rolls shall be capable of being unrolled easily. There shall be no hard bands which adversely affect unwinding and use. In any roll each end face shall at no point depart from its principal plane per pendicular to the axis of the core by more than ±1 mm unless otherwise specified.
3.3 Joins(splices)
The number of joins(splices)， where these are permitted, shall be in accordance with the require- ments given in Part 3(under consideration)
Where joins are permitted, they shall be suitable to withstand the mechanical and thermal stresses ormally encountered in subsequent use.
Special requirements such as visibility, heat or solvent resistance, shall be agreed upon between purchaser and supplier.
Joins shall be as thin as possible and may be made by fusion processes such as, for example, welding r with adhesive tape. Adhesive tape, if used, shall be preferably not thicker than the film itself and there shall be no exudation of or from the adhesive.
Joins shall not impair the unwinding of the film and shall be clearly visible when viewed from the end faces of the roll, unless otherwise agreed between purchaser and supplier.IEC 60674-1:1980 pdf download.