Underground cables We understand by underground cables those installed below ground level. These cables may or may not be tubed. In the case of being tubed, the characteristics do not differ much from cables that are tubed in other places. Perhaps rodent attacks just have to be considered as a certain possibility. Cables can be laid by hand or pneumatically. In long runs, pneumatic laying is usually used, known as the “blowing system”. Basically the process runs using a hydraulic motor to pull the cable, while injecting pressurized air through the channel at the same time. This way, the friction between the cable and the conduit decreases and the operation is simple and fast. That is, we do not launch the cable with compressed air, the air only facilitates the sliding inside the tube. This …

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The jackets We have been emphasizing in the previous entries of this blog that different applications require different cables. And one of the most important criteria when choosing the right cable for our project is the jacket. As a general rule, we can divide fiber optic cables into single-jacket and double-sheath cables. Normally we will find double-jacket cables in outdoor uses and mainly inside pipes and aerial lines. Single PE jacket fibre cable Cable with two PE jackets When a double jacket is used, a reinforcing element is added in between them, usually fiberglass, aramid or steel reinforcement. Following the regulatory standards, if the cable is going to be installed inside a home, public place or when the projecting engineer so determines, the jacket must be made of halogen-free material and classified in accordance with …

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Aerial cables A cable for aerial laying has, in addition to its own requirements for its operation, an additional critical requirement, and that is it must be able to support its own weight in the worst conditions. These worst conditions refer to wind and ice and some exceptional issues such as birds perching. The most important parameter to be taken into account is the length of the span or distance between posts. The cable has to be designed according to this data plus the previous ones of wind and ice. Depending on the mechanical request, the length of the span to be covered, etc., we can find different types of mechanical reinforcement. There are 2 main types of cables for overhead lines Self-supporting cable. Also called by its acronym in English ADSS (aerial dielectric self …

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