Is there a power cable that does not have a cable protection tube
【1】 GB-92 Article 5.4.2 cable embedding depth should meet the following requirements: First, the cable surface distance from the ground should not be less than 0.7m. Through the farm should not be less than 1m. In the introduction of buildings, and underground buildings cross and bypass underground buildings, can be shallow buried, but should take protective measures. Second, the cable should be buried in the frozen soil below, when subject to conditions, should take measures to prevent damage to the cable. General in the construction, the buried cable we all use armored cable, in order to ensure safety. (Ditch), oil pipe (ditch), combustible gas and flammable liquid piping (ditch), heat equipment or other pipe (ditch), although the net distance to meet the requirements, but the maintenance of the pipe Road crossing the cable may be within 1m before and after the intersection, should still take protective measures; when the cross-distance can not meet the requirements, the cable should be inserted into the tube, the net distance can be reduced to 0.25m. Fourth, the cable and heat pipe (ditch) and thermal equipment parallel, cross, should take the insulation measures, so that the temperature around the cable temperature does not exceed 10 ℃. [2] high-voltage cable: high-voltage cable is a power cable, Is used to transmit 10KV-35KV (1KV = 1000V) between the power cable, and more used in power transmission of the main road. High-voltage cable product implementation standards for the GB / T.2-2008 and GB / T.3-2008.
Garden wire, you can know the size of the garden, and know how thick it is. Garden of the United States Chiang formula: S = πr ??. R = √ S / π. Diameter: d = 2r. So: r ?? = √16mm ?? ÷ 3.14 ≈ √ 5 = 2.25mm (mm)
Conductor diameter of about 5.1 mm, insulation thickness of 1 mm.
16mm2 and wood pencils are almost thick, sub-core soft and single-core hard-line soft calculation of the current will be more hard-line calculation of the current will be less electricity in the conductor of the epidermal movement.
