gui chao cable news: to identify the quality of wire
from：guichao author：admin click： 345 addtime：2017-04-17 17:16:31
first, weight.
good quality wire,
generally within the specified weight range.
such as the commonly used cross-sectional area of 1.5 mm2 plastic insulated single copper wire,
every 100 m weight of 1.8 ~ 1.9 kg;
25 mm2 plastic insulated single stranded copper conductor,
every 100 m weight of 2.8 ~ 3 kg;
4 mm2 plastic insulated single stranded copper conductor,
every 100 m weight of 4.1 ~ 4.2 kg.
the poor quality of the wire is short of weight or length is not enough,
or wire copper core impurities too much.
two, copper.
the qualified copper wire core should be purple red,
shiny, soft feel. the core of copper and copper wire is purple black,
partial yellow or white, impurities, mechanical strength, poor toughness,
a little force will be broken, and the wire is often broken phenomenon.
when you check, you just peel off the wire 2 cm,
and then use a piece of white paper on the copper core slightly rub,
if there is a black material on the white paper, indicating that more impurities in the copper core.
in addition, the inferior wire insulation looks very thick,
in fact, most of them are made of recycled plastic,
for a long time, the insulation layer will aging and leakage.
three, manufacturers. fake and shoddy wire is often "three noes products",
but it also has ambiguous origin and other signs,
such as china manufacturing, manufacturing chinese province or a city,
this is actually equivalent to the origin of the standard.
4, the price. due to the low cost of fake and shoddy wire production,
therefore, traders in the sale, often in the guise of cheap sales,
make a fool of sb.