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2. In the cable trench, due to the poor handling of the sealing problem in the trench, the mouse or small animal often enters bites, touches, and damages the cable.
3, because the cable is basically produced in the factory 100M circle production (except for a large number of custom), in the fountain project, the distance from the control room to the pool is not the same, sometimes tens of meters, sometimes more than 100 meters Not so, this results in wasted cables or joints in the middle, which increases the difficulty of construction.
Several Problems Frequently Occurred in the Use of Rubber Jacket Cables in Fountain Engineering
1. The cable is a rubber sheathed cable. It can be used in the fountain pool with water cooling, single or multiple roots in the cable trench and threading pipe (when the thermal effect is not enough). It can fully meet the requirements because of its safe working temperature. Up to about 60-70°C, the use of heat dissipation in a single or multiple conduits is completely without problems. Therefore, the use of a small fountain project can fully meet the requirements. However, in large and medium-sized fountain projects, it is not the same. Because there are a large number of equipment in large and medium-sized fountain projects and there is a certain distance from the control room to the fountain pool, the commonly used laying methods in this distance include cable trenches and conduits. , buried cables (usually not used), cable bridges, etc., no matter which method is adopted in the above several methods, it is inevitable that dozens or even hundreds of cables are put together to form a large or large number of cables. Bundled together in a tube rack so that in the operation of the fountain equipment, the cable generates a certain amount of heat (although it is within the allowable operating temperature, it will generate a certain amount of heat), and the heat is sheathed by the interaction. The rubber is severely deteriorated due to its inability to dissipate heat or its slow heat dissipation. According to this number of years of work experience and surveys of many fountain companies' engineering maintenance (mainly overhaul), there is a common problem that the normal working life of the cable should be five to ten years, but it is found in practical applications. The life of the cable in the water part can basically meet the requirements, but the cables in the cable ditch or the threading pipe are far from each other. Basically, after the fountain is in normal operation for 2-3 years, the rubber cracking of the cable jacket begins to occur, and the insulation is reduced. Stick to each other. At this time, the cable can not be processed. Once the handling is carried out and the cable is replaced (although it is almost impossible to replace a few of them), the cable protective layer begins to fall off and crush. If it is not replaced, there will be a leakage trip phenomenon, or even a series of problems involving safety. Basically, it cannot be used normally. This is the insulation of rubber sheathed cables in large and medium-sized fountains caused by heat dissipation problems in the conduits or cable trenches. The actual situation of reduced layer and shortened service life;