| 摘要 |
A tube (1) is described that is made of web reinforced with polyvinylchloride, for suspending to ceiling of a tunnel or like, that is web in form of a tube with inner and outer coating made of polyvinylchloride. The inner coating is black electro-conductive polyvinylchloride coating, and the outer coating is white electro-insulating polyvinylchloride coating. The tube (1) has outer long strip (2) made of black electro-conductive polyvinylchloride in contact with inner coating. The strip (2) is earthed with means (3-5) for suspension of the tube (1) to ceiling. |
