1, NLYV, agricultural directly buried aluminum core polyethylene insulated polyvinyl chloride sheathed wire
2, NLYV-H, agricultural directly buried aluminum core polyethylene insulated cold-resistant polyvinyl chloride sheathed wire
3, NLYV-Y, agricultural directly buried aluminum core polyethylene insulated termite-resistant polyvinyl chloride sheathed wire
4, NLYY, agricultural directly buried aluminum core vinyl chloride Insulated black polyethylene sheathed wire
5, NLVV, agricultural directly buried aluminum core PVC insulated PVC sheathed wire
6, NLVV-Y, agricultural directly buried aluminum core PVC insulated anti-termite PVC sheathed wire
Ground wire's role:
(1) to protect the safety of the person
Because of the static discharge is prone to generate a large number of charges, if the electrical equipment does not have a A large number of charges, if the electrical equipment is not properly isolated, it will be very easy to electrical appliances themselves and the human body caused great harm, and the role of the grounding wire just happens to be a high-voltage equipment and the earth between the wire, play to avoid us by the charge damage purpose.
(2) lightning
Placed in the past, once the occurrence of thunder and rain, poles and other equipment are often damaged because of lightning strikes, sometimes even days can not be used, so the role of the grounding wire in the role of lightning can be a very good protection, and effectively extend the service life of the electrical equipment.
(3)? Ensure normal work operation
For some must have electricity to carry out the work, such as medical work, the role of the grounding wire is to avoid encountering power outages when the unexpected situation, not to be affected, still be able to operate normally a small load reference potential.
Expanded informationBuried line standards
1, underground direct buried cable lines should be armored cable. The buried depth of the cable should be from the ground to the outer skin of the cable not less than 0.7m; cable outer skin to the foundation of the underground building 0.6m, shall not be less than 0.3m; cable spacing from each other: horizontal proximity to a minimum of 0.1m, different sectors of the cable spacing from each other 0.5m.
Cable cross each other with a minimum net distance of 0.5m; cables and heat pipelines, gas, petroleum pipelines close to a net distance of 2m, cross each other with a net distance of 0.5m. distance is 2m, and the net distance is 0.5m when crossing each other; the distance between cables and tree trunks is not less than 0.7m.?
2, direct buried cable trench shall not have stones and other hard impurities, otherwise it should be paved with 100mm thick layer of soft soil or sand, cable laying above and then paved with 100mm thick layer of soft soil or sand, and then covered with a concrete protection board or brick, the width of the cover should be beyond the cable on both sides of 50mm.
3, direct buried cable into the hand hole well, manhole well, control box and distribution room should be worn in the protection pipe, and the mouth of the pipe should be made waterproof plug. And city roads, bridges and other crossings should increase the protection pipe, the top of the protection pipe to the road surface depth of not less than 0.7m, the protection of the two ends of the pipe out of the driveway not less than 0.5m.
Cable from the ground out of the ground, the ground should be added to a section of 2.5m of the protection pipe, the root of the pipe should be extended into the ground 0.2m, the protection of the pipe shall be fixed securely.
Baidu Encyclopedia-Agricultural Land Buried Wire