NOYAFA Electronic specializing in testing instruments and cable testers for 16 years
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NOYAFA Electronic specializing in testing instruments and cable testers for 16 years
Author: Noyafa–Cable Length Tester
Cables are the main electrical products used to transmit power engineering and realize electromagnetic induction energy conversion. Cable routing instrument manufacturers believe that any industrial production, road transportation, engineering buildings and equipment, modern agriculture and scientific research, military weapons and equipment or cables are the main electrical commodities used to transmit power engineering and realize electromagnetic induction energy conversion. Cable routing instrument manufacturers believe that any industrial production, road transportation, engineering buildings and equipment, modern agriculture and scientific research, military weapons and equipment or military facilities, outer space, deep sea testing and social daily life are closely related to cable products.
Question 5: How many cables can be laid in the cable trench without brackets? Answer: Generally, brackets are required. If there is no bracket, the maintenance of cables in the cable trench will be more troublesome. If the project is not large and the number of cables is not large, it is okay to not set it, but the heat dissipation conditions will be worse, and if there is water in the trench, it will also affect the cables. Question 6: Can the high-voltage and low-voltage cables be laid in the same cable trench? (Supplementary question: outdoor cable trench, trench width 1200mm, supports on both sides, 10KV high-voltage cables are routed on one side, and 1KV-level low-voltage cables and control cables are laid on the other side. Does it conform to the specification? What should be paid attention to?) Answer: It can be laid in the same cable trench, and the specific requirements can be found in GB 50217-2007 P24 5.1.3, 5.1.4 requirements.
Question 7: The cable trench is parallel to the road, what is the laying distance? Answer: This is mainly to consider the force of the cable trench cover. If there is no problem with the force, there is no problem. According to the manufacturer of the cable routing instrument, it is generally sufficient to set it on the sidewalk or where the motor vehicle does not pass. Question 8: Should armored cables be used when cables are laid in cable trenches? (Supplementary question: Technical measures say: When cables are laid in cable trenches or cable tunnels, it should be considered to use anti-ant and anti-rodent functions. Steel tape armored plastic outer sheath type cable.
But it doesn't seem to be clearly stated in the specification! Is it possible not to use armor?) A: There is no mandatory requirement to use armor for direct buried cables, and there is no cable trench. According to different environmental requirements, (if the rat activity is rampant in this area, it is recommended to armour) There is generally no mandatory requirement. Question 9: In the cable trench, what is the minimum distance between strong current cables and weak current cables when they are layered on the same side bracket? Answer: Separate the weak current cables with metal plates, and ground the metal plates at the same time! Best, Place an iron plate (or metal slot box) on the uppermost bracket, the iron plate is grounded, and the weak current cable is placed on the iron plate (in the slot box).
According to GB 50217-2007 5.1.3 Article 1: power cables with voltage levels from high to low, control and signal cables from strong current to weak current, and communication cables should be installed“top down”in order. Then it can be determined according to GB50054-2011 table 7.6.23.
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