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Quality identification of wire technique

Information Source:Henan Huadong Cable Co., Ltd  Release date:2014-03-25

One, weight. Good quality wire, generally in the specified weight range. Such as the cross-sectional area of the 1.5mm2 is commonly used plastic insulated single stranded copper core, every 100m weight 1.8 ~ 1.9kg; 2.5mm2 plastic insulated single stranded copper core, every 100m weight 2.8 ~ 3.0kg; 4.0mm2 plastic insulated single stranded copper core, every 100m weight is 4.1 ~ 4.2kg. Insufficient wire weight of poor quality, or the length is not enough, or too much impurity copper wire.

Two, bronze. Copper core copper wire qualified should be purple red, shiny, soft. But the copper wire copper core and fake purple black, yellow or white, impurities, poor mechanical strength, toughness is poor, slightly will be broken, and the wire breaking phenomenon often. Check the wire, as long as you head off 2cm, then a blank sheet of paper in a copper core slightly rub, if there is a black substance that white paper, copper core of impurities in the more. In addition, shoddy wire insulation layer seems to be very thick, the fact is they are made from recycled plastic, for a long time, the insulation layer will aging and leakage.

Three, with the caliper measurement wire diameter, calculation of line diameter meets the requirements (2.5 square diameter is 1.78 mm, not less than 1.762, 4 square wire diameter should be 2.25).

Four, please see the specification GB50303-2002.3.2.12 of wires, cables shall comply with the following provisions:
1 according to the number of inspection certificate, production license number certificate ", according to the rated voltage 450/750V and below PVC insulated cables" GB5023.1 - 5023.7 standard product safety certification mark;
2 visual inspection: the packaging intact, sampling of the wire insulation intact, uniform thickness. Cable is not compressed, twisted, armoured not loose coil. Heat resistant, flame retardant wire, cable outer sheath are clearly identified and manufacturing factory;
3 according to manufacturing standards, sampling spot diameter thickness of insulating layer and the circular core; core diameter error is not greater than the nominal diameter of 1%.

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