Views: 0 Author: Site Editor Publish Time: 2022-08-12 Origin: Site
1. The number of wrapping layers should generally be wrapped by 50% for two layers or 5% for four layers.
2. Choose the correct refractory mica tape and analyze the combustion performance. There are the following models. Double-sided synthetic mica tape has the best fire resistance (fire resistance temperature 1000), and it is recommended to use single-sided synthetic mica tape with better fire resistance (fire resistance temperature 1000) for key projects. Double-sided phlogopite tape is recommended for key projects with slightly better fire resistance (fire resistance temperature 800) It is recommended to use single-sided phlogopite tape with slightly better fire resistance (fire resistance temperature of 800) for general projects. It is recommended to use single-sided phlogopite tape with slightly better fire resistance (fire resistance temperature of 800). It is recommended for general projects because the single-film mica tape on the market is a motor Use mica tape, not for cables, it is recommended not to use.
3. The wrapping process is also very important, and must be very careful and operated with caution. The production of fire-resistant wire and cable itself is not complicated, but it is not simple to produce fully qualified ones, and in many cases, in addition to selecting a good mica tape, the cable manufacturer's own wrapping production must be well controlled.
4. General requirements for refractory mica tape
Refractory mica tape is an electrical insulating material made of glass fabric or plastic film and powder mica or synthetic mica, which are impregnated and bonded with high temperature resistant resin glue. Its melting point is 1200~1300 ℃. In order to ensure that the cable can continue to run for a certain period of time after the fire. The selection of refractory mica tapes should be based on actual requirements, and the actual requirements for the selection of refractory mica tapes should meet the requirements of fire-resistant properties of refractory cables.
a) The production process of the refractory mica tape shall comply with the International Electrotechnical IEC 371-3-8:1995 standard
b) The nominal thickness of refractory mica tape is from 0.05mm-0.15mm mica tape.
c) The finished product of the refractory mica tape should be of the same quality from the beginning to the end, and should meet the requirements of the standard.
d) The surface of the refractory mica tape should be free of defects such as bubbles, pinholes, and creases.
e) It is supplied to users in a soft state in rolls. The refractory mica tape supplied in rolls should be able to be continuously unwound and should be easily separated without sticking.
f) Fire resistance properties of refractory mica tapes: There is no current test method for fire resistance of refractory mica tapes. However, experience has shown that fire-resistant mica tape can be used to design correct fire-resistant cables, and fire-resistant mica tapes used to design correct cables should be able to pass GB19216-2003/IEC 60331-21: 1999 "Cable or optical cable under flame conditions" Line Integrity Test "Fire Test Requirements.
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