초록 ▼

The disclosure sets out a fire-retardant electrical cable including a metal conductor and at least a double layer polymer coating disposed to surround the metal conductor. The double layer coating defines an inner and an outer layer wherein the inner layer includes a polymer matrix, a predetermined

The disclosure sets out a fire-retardant electrical cable including a metal conductor and at least a double layer polymer coating disposed to surround the metal conductor. The double layer coating defines an inner and an outer layer wherein the inner layer includes a polymer matrix, a predetermined first amount of a flame retardant inorganic filler and a predetermined amount of a coupling agent. The outer layer includes a polymer matrix and a predetermined second amount of a flame retardant inorganic filler. The inner layer employs the predetermined first amount of inorganic filler in an amount lower than the predetermined second amount of inorganic filler in the outer layer. The inner layer includes the predetermined amount of coupling agent in an amount such that upon placing the cable in water, it keeps the long term insulation resistance of the cable substantially constant.

대표청구항 ▼

1. A fire-retardant electrical cable having long term insulation resistance comprising a metal conductor and at least a double layer polymer coating disposed to surround the metal conductor, said at least a double layer coating defining an inner and an outer layer, wherein:said inner layer comprises

1. A fire-retardant electrical cable having long term insulation resistance comprising a metal conductor and at least a double layer polymer coating disposed to surround the metal conductor, said at least a double layer coating defining an inner and an outer layer, wherein:said inner layer comprises a polymer matrix, a predetermined first amount of flame retardant inorganic filler and a predetermined amount of coupling agent; and said outer layer comprises a polymer matrix, a predetermined second amount of a flame retardant inorganic filler; said predetermined first amount of inorganic filler in the inner layer being lower than said predetermined second amount of inorganic filler in the outer layer, and said predetermined amount of coupling agent having properties wherein the long term insulation resistance of the cable is kept substantially constant when the cable is placed in water.