The urban power optical cable in the cable trench is easily affected by high temperature erosion and arc burning of cables laid in the same trench; The existing outer sheath material of urban power optical cable is mainly organic synthetic material, which can not withstand the high temperature erosion and arc burning of the cable, and is easy to aging failure, leading to signal interruption or even fire failure of urban power optical cable.

      In the above technical scheme, the thickness of the glass fiber yarn layer is 3 mm, the thickness of the carbon fiber cloth layer is 2 mm, and the thickness of the silicone rubber layer is 1 mm. Compared with the prior art, the utility model has the following beneficial effects.

1. The main material of the fireproof bushing used for this wire and cable is silicone rubber added with composite flame retardant. There is no electrochemical corrosion of organic synthetic materials in the past. It has strong arc resistance and heat insulation. Its stability, corrosion resistance and aging resistance are good.

2. The glass fiber yarn layer and carbon fiber cloth layer have very low sensitivity to the environment and are almost not affected by external factors, so the high temperature resistance of the fireproof sleeve for wire and cable can remain unchanged for a long time, which is incomparable with the traditional high temperature resistant and flame retardant materials.

3. The utility model is soft and easy to lay, and is especially suitable for the construction and transformation of the safety protection of the urban power optical cable in the cable trench.