what kind of VLV cable is needed, how to determine, after the cable from the low-voltage distribution box out, 460m arrived distribution of electricity 100It's best to explain how to calculate, how to determine the current, and the specifications of the cable, thank you very much!630 of the box changed to the distribution box for the cable, 240 of the cable is single core, or 3*240 cable. What kind of cable can be specific about it? Underground directly buried, directly to a cable model, aluminum core cable
VLV3*50 square line or VLV3*70 of the square line on the line, to zero line, plus a zero line is 3*50+1*25 or 3*70+1*35.
Two way 240 are used together,Pe=75*5=375Kx=1Pjs=pe*kx=375Cos=0.8Ijs=pjs/ue/3/cos=375/220/3/0.8=710Adopt cable specification, 2 way 4*240+1*120 parallel useIn the case of direct buried laying, the selection of outer sheath of cable shall comply with the following provisions:1 when the cable is under greater pressure or has mechanical damage, it should have reinforced layer or steel tape armour.2 in the quicksand, backfill, land and other possible displacement of soil, the cable should be steel wire armored.3 termite serious harm extrusion cable area, should choose higher hardness of the outer protective layer can also be thin in common outer sheath is extruded on the higher hardness of the protective layer, which can be used as the material of nylon or special polyolefin copolymer, also can be made of metal or steel armor.4 the outer layer of polyethylene should be used in areas with high underground water table.5 in addition to the above circumstances, the outer sheath without armour may be used.
Current of pile driver 5*75=375KW/0.8=468.75KW/380/1.732=712AThe ampacity of the cable is 240 square meters, about 390ASo we need two 240 square parallel.
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