Electricity: conductors and insulators – Overhead – Towers – poles or posts
Patent
1978-01-27
1980-02-19
Dixon, Jr., William R.
Electricity: conductors and insulators
Overhead
Towers, poles or posts
106 1811, 106 1827, 106 1836, 174121A, 252 5, 428325, 428494, 428500, 428538, 428539, 428921, 521 84, 521 85, 521 91, 521907, 260DIG24, H02G 304, C09D 518, B32B 516, B32B 904
Patent
active
041896190
ABSTRACT:
A fire protective mastic is provided, whose essential components are solids including a low fusing ceramic frit, hydrated solids having chemically bonded water which is released as a fire protective water vapor when heated, solids which expand or intumesce during the same heat application to form a porous, expanded or foamy insulating body, solids which have a fire break effect, such as antimony oxide and zinc tetraborate, and binder solids which are thermoplastic resins and serve to bind the solids into a flexible coating when applied, the binder solids being dispersed as an emulsion in water and mixed with the other solids to form a mastic. With further addition of water it is converted to a selected viscosity for application by troweling, coating or spraying. The mastic is applied as a coating or a precast boot upon single or grouped electric power and control cables to restrict fire propagation and to prevent self ignition of cables from fires due to overloading or other electrical faults, or from oil, waste or trash fire sources. The mastic is further usefully shaped into fire protective panels the latter of which, when dried, can be mounted as a protective wall insulating a section of cables passing from area to area as a fire stop. The total panel can be formed of the dried mastic, or the mastic can be coated upon one or both sides of insulating panels such as ceramic fiber boards, to further reduce the temperature gradient through the panel upon fire exposure and thus appreciably reduce the temperature on the cold side by 50.degree.-70.degree. F., thereby minimizing the danger of self ignition of gases or combustible materials such as cable jacketing, insulation or other flammable materials.
REFERENCES:
patent: 3090764 (1963-05-01), Ellis et al.
patent: 3861425 (1975-01-01), Clark
patent: 3912671 (1975-10-01), Kondo et al.
patent: 3928210 (1975-12-01), Peterson
patent: 3940549 (1976-02-01), Whittum et al.
patent: 4018962 (1977-04-01), Pedlow
patent: 4018983 (1977-04-01), Pedlow
Yabuki et al., "New Types of Fire Retardant Materials and Their Application to Fire Protection of Cables", Dainichi-Nippon Cables Review Ltd., #61, pp. 56-71, Sep. 1976.
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