Wire and cable , especially PVC insulated cable (commonly known as plastic wire ) is the main carrier of power transmission , the use of very wide , especially in the " city network , rural power network transformation into the family line and home decoration indoor line is very large amount of raw material for production of polyvinyl chloride insulated wire and cable products mainly copper wire , aluminum wire and PVC insulation material (commonly known as plastic ) , therefore , the quality of their qualities will directly affect the PVC insulated cable products . The face of many enterprises cables products , consumers in the purchase and use should pay attention to the following points :
First of all , should be trustworthy , good reputation of the product .
Second , pay attention to product identification , to prevent counterfeit products . General PVC insulated cable product labels should be marked with the name and address , rated voltage , specifications , length and so on , especially in the cable wire should be printed with continuous marks including factory name , type , rated voltage , single line spacing should be not greater than 200 mm , sheath line marker spacing should be less than 500 mm .
Tird , buy PVC insulated cable products before , first of all to consider its good use . The general situation are that through the power of the electric appliance , the current of the wire is calculated and the size of the wire is selected according to the current . It's best to consult with an experienced and professional electrician , because the section carrying capacity and conductor wire , wire and materials (aluminum or copper ) , method of laying type , (surface or through pipe etc . ) and ambient temperature and so on , there are many factors affecting the complicated calculation .
Fourth , You can look at the cross section of wire , copper (aluminum ) core should be in the middle and the plastic layer thickness should be uniform . Then you can try the plastic strip wire end . If it is easy to strip , there may be plastic strength is not enough . The stripping of copper (aluminum ) core after that , can look at the copper (aluminum ) core materials , under normal circumstances the surface should be with metallic luster , if the white surface blackening of copper or aluminum surface is metal oxide . It is best not to sell . If possible , you can try to burn it . If the general lighter can burn , and no flame self extinguishing or self extinguishing time is longer . The wire is not burning , so the wires do not buy .
Finally , in the use of plastic wire must correct wiring . Usually best by professional electrical wiring , their connection , pay attention to plastic wire joint should be firmly connected , not simply taped together , so electricity joint easy to heat , will lead to serious fire !