Check method for single-core cable of road illumination system

Abstract

The invention discloses a check method for a single-core cable of a road illumination system. The method comprises the following steps that a universal meter is adopted to find out one cable to serveas a PE cable; the remaining four cables are marked at the tail ends as the cable A, the cable B, the cable C and the cable N; four switches and four loads are selected, and each marked cable at tailend is connected with one switch, and is connected with one load at the head end; each switch communicates with a temporary power supply live wire, and each load communicates with a temporary ground wire column; for the switch connected with the cable A at the tail end in a connected mode, the load which reacts after being electrified is found at the head end, and the cable connected with the loadwhich reacts after being electrified is the cable A; and the cable B, the cable C and the cable N are found out according to the method in the step e. According to the method, outer sheathes of the cables are not damaged, wiring of each loop is correct, not only the construction efficiency is improved, but also the construction cost is reduced, the construction quality is guaranteed, and the power supply safety is improved.

Description

technical field [0001] The invention relates to the technical field of electric power construction, in particular to a method for checking a single-core cable of a road lighting system. Background technique [0002] Municipal roads are densely populated places with high safety requirements, and underground cables have higher anti-leakage requirements. All measures must be taken to reduce hidden dangers and improve power supply safety. [0003] Some municipal road lights are powered by a three-phase five-wire double-circuit single-core cable. , C is the phase line, N is the neutral line, PE is the grounding line) The three-phase interval is balanced to supply power to the street lamp, but the sheath of this kind of cable is black when it leaves the factory, so when wiring in the hand hole well, the color of the sheath of the single-core cable cannot be passed. Intuitively judge which 3 of the 220V power supply A / N / E or B / N / E or C / N / PE required by each lamp meet the wiring re...

AI Technical Summary

Problems solved by technology

[0003] Some municipal road lights are powered by a three-phase five-wire double-circuit single-core cable. , C is the phase line, N is the neutral line, PE is the grounding line) The three-phase interval is balanced to supply power to the street lamp, but the sheath of this kind of cable is black when it leaves the factory, so when wiring in the hand hole well, the color of the sheath of the single-core cable cannot be passed. Intuitively judge which 3 of the 220V power supply A / N / E or B / N / E or C / N / PE required by each lamp meet the wiring requirements of the lamp. 5 single-core cables are calibrated and marked in the hand hole of each street lamp to achieve balanced and spaced power supply for A / B / C three-phase power supply

The conventional calibration method is to directly peel off the sheath of each cable in each hand hole, and use the principle of the calibration light to perform calibration, mark A / B / C / N / PE respectively, and then carry out according to the circuit requirements. Connect the wiring, and then perform insulation recovery and waterproof treatment on the cables that do not need to be connected. This is a simple and direct construction, but the hidden danger of cable leakage caused by water accumulation in the hand hole well will inevitably lead to hidden dangers of electric shock. Waste of materials and labor costs for insulation restoration

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