【 Weak current college 】 selection stage lamp wire

Because the wire improper selection luminaire for damage, caused by the fire accidents. Some because of the lack of this knowledge, while others are cutting corners, and construction units is the use of poor quality wire rod. This article on this knowledge. We all know that the wire lamps are of two categories: one category is controlled mainly DMX512 signal line, the other one is the current type, mainly lamps of conductive cable. The former type — controls the type of wire, we mainly on wire diameter, insulation and shielding layer. With the wire length increase in diameter to rough, generally not less than 0.2 square mm, it is best to 0.4 square millimetres above the shield to the dense, generally not less than 128 network, such as the control signal loss, also effective in shielding the foreign interference signal, as the number of shielding lead to three core, General, four-core. The latter type — current-carrying wire, according to the lighting power, conversion into operating current, then depending on the wire, check the corresponding Select current carrying capacity. As a result of a variety of wire of various specifications, carring and diameter of the load flow is not the same, from the schedule we found some laws: a wire with insulation layer, protective layer increases, the current downward trend; the second is the increase in the number of cores, but also the current downward trend. Third, with the core cross section area increases, its cross-sectional area containing flow downward trend. With these three, together with our project estimation: on summary per mm2 cross section area, the current values for the cross-sectional area of 10 times. For example, the conductor cross-sectional area of 1 square millimeter, its current of 10 amperes, combined with the preceding three rules to make an adjustment, then have a 30% ~ 50% margin, lamp work long hours are considered to be safe. Here, three-phase electric current per phase is the lamp of total powerdivided by 220 divided by 3, namely every phase current. In addition, those who concealed walk bridges, canals, you can use the single hard wire (BV) or single-core soft (BVR line) or multicore flexible cable (RVV), to activities of wire, cable, general use wire diameter, core wire number according to the need to select. Finally, recognition of the quality of the wire is very important. Visually, the copper conductor line looks new bright, soft moderate quality is better, the color is dark, excellent, too soft, not on the thickness of wire rod, wire diameter, don't listen to vendors, field take, or compare is the actual value, because the market most wire diameter are not standard values.