Cables and wires for overhead power lines. Self-supporting cable. Laying naked and bare wires on the air is used for a long time, and there will be a very long time. Since it is not always possible to implement laying in the ground or underground utilities, a new cable – CIP and SAPTA. What kind of wire are you? Until recently, all have used bare wire grades A and AS, which are normal cable twist lived aluminum wire cross-sections from 16 to 400 mm2, without exclusion.
This so-called bare wires that are routed by air way, stretching between the support pillars with bracket for special insulators. The main disadvantages of laying bare wires: the possibility of short circuit, under bad weather conditions is a high probability of electrical injuries, the possibility of unauthorized connection. New wiring for the air seals are self-supporting insulated wires insulated with thermoplastic CIP. These wires are used for the implementation of the slopes, and for the main installation. The most effective self-supporting wires are used for installation on the facade of buildings in urban environments, as well as for the construction of parks, residential areas, etc. Uninsulated wires A and AS are becoming less used in our life due to their replacement by a self-supporting wire SIP or SAPTA. The main advantages of CIP wires are: lack of short-circuits the ability to connect customers without power cuts, low pozharbezopasnost; no unauthorized connections; possibility of laying on the perimeter.
In Ukraine, the national standard DSTU 4743:2007 produced many different brands of self-supporting wires, but most common are: STS-4m – self-supporting, with aluminum wire (phase) current-carrying conductors, insulated with light-thermoplastic polyethylene, without carrying a separate vein, CIP-4 – the same as the STS-4c, but insulation of the light-cross-linked polyethylene; SIPn-4 – the same as the STS-4, but the insulation is not flame retardant. These brands wires may have the following sections: 2×10, 2×16, 2×25, 4×10, 4H16, 4H25, 4H35, 4H50, 4H70, 4H95, 4H120. If to analyze the sales of self-supporting insulated wires of our plant in 2009, 2010. then we can conclude that the greatest demand is for a wire insulated with conventional polyethylene (STS-4c), and the isolation of flame retardant cross-linked polyethylene (SIPn-4). We think that this trend will continue in the future.