In everyday life we use many electrical
appliances that require a variety of wire and cable in the choice and placement
of which requires special knowledge and rules. Choosing the cable or wire
should be guided by the basic criterion - purchase goods only from
manufacturers of famous brands and proven in the field of reliability and
quality.
The residential area is mainly used PVA
brand wire and cable brands such as VVG, NYM and VVGng. PVA is a stranded wire,
with a circular cross-section copper wire. It is used to connect power tools
and household appliances, gardening. Wire laying at a temperature between -15o
C to + 40o C Wire insulated material of PVC plastic. Core - copper, flexible 20 AWG cable.
VVG applies to power cables. Its use in
stationary installations is for the distribution of electric power with voltage
of 0.66 to 1 kV, in a temperature range from -50 to +50 degrees and humidity of
98%. VVG cables used for installation in residential and industrial premises,
in dry and wet. VVGng cord is different from the VVG that its shell is made of
heat-resistant materials, so it is used at facilities with special requirements
for electrical and fire safety.
Cable core VVG and VVGng made of soft
copper wire of circular cross section. By increasing the cross-section of more
than 16 square millimeters, it is performed live as much of the wire harness. And
finally, it is the brand NYM cable. Thanks to an extra layer of chalk-rubber
insulation from the cable, increasing its resistance to cracking during
installation in extreme conditions. External insulation is made of a flexible
plastic, which leads to increased safety. Thanks to these qualities, the
popularity of this cable is continuously growing. BTW, you can select the 20
cable at Banggood. Besides, you can easily get other electrical accessories (e.g.
translucent bag) there with high quality and reasonable prices.
Cable cross-section area is considered electrically conductive wires. According to the formula π (= 3.14) xr2 calculated cross section of a circular core. The cable typically has several conductors, so the total cross section of tiles equals the sum of the cross sections of each core. Cable cross-section selected with future load. Note, however, that the cross section of aluminum wire should be chosen much higher, because its conductivity is 40% lower than that of copper wire.
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