Where reels are supplied with protective material fitted over the cable, the protection should remain in place until the cable will be installed. During installation, all curvatures should be smooth. The cable should be bent as little as possible. ing and blowing a cable in a duct and the impact on the cable designs. Strictly observe your company's lead handling procedures to eliminate this hazard. Turn-backs and all sharp changes of direction. This book describes and compares several methods for installing cables in ducts. In the past pulling was the most popular technique, but the relatively low weight of optical cables has stimulated the development of several new techniques. The blowing technique is perhaps the most well known of. Installation of cables in ducts is a common practice today, for both telecommunications and energy transport, ranging from single optical fibres to energy cables of over 100 mm diameter, and a mass of more than 10 kg/m.