each coil of wire is marked with the words Guilin International, which has C-3 and EU ROHS certification. Each coil of wire has a certificate of conformity, and there is a unique verification code behind the certificate, which can be verified in official website.

1. Look at the quality of the wire. If the copper wire inside is purplish red, shiny and soft, it means it is a good copper wire. If the copper wire is purple-black, dull, and it breaks when folded, it must be inferior.

2. The weight of the wire is too light. Normally, the weight of the qualified 2.5-square wire should be 3kg per 1 meters, and the error should not exceed ．2kg. If the weight error of the wire bought is too large, there is bound to be the behavior of cutting corners, and such wires should not be used.

Extended information:

Cable specification is the meaning of the representation of the number of cores and cross-sectional dimensions of wires and cables. The wire and cable products used in the power system mainly include overhead bare wires, busbars (busbars), power cables (plastic cables, oil-paper power cables (basically replaced by plastic power cables), rubber-sheathed cables, overhead insulated cables), branch cables (replacing some busbars), electromagnetic wires, and wires and cables for electric equipment.

general representation

1. single-core branch cable specification representation: number of cables in the same loop *(1* nominal cross section), .6/1KV,?

such as: 4*(1*185)+1*95 .6/1KV

2. Specification expression of multi-core and sheathed branch cable: number of cable cores× nominal section -T, such as: 4×25-T?

Detailed representation

Because branch cables include trunk cables and branch cables. Moreover, their specifications and structures are different, so there are two ways to express them:

1. Express the trunk cable and the branch cable separately,

For example, trunk cable: FD-YJV-4*(1*185)+1*95 .6/1KV? [1]?

feeder cable: FD-YJV-4*(1*25)+1*16 .6/1KV

This method is particularly concise in design, and can easily show the difference of feeder cable specifications

2. Express the trunk cable and feeder cable together, such as FD-YJV-4

(1

This method is relatively intuitive, but it is only limited to the case that the branch cables are of the same specification, and it cannot represent the different specifications of the branch cables.

As the branch cables are mainly used in 1KV low-voltage distribution systems, their rated voltage of .6/1KV can be omitted when designing and marking.

Reference: Baidu Encyclopedia-Cable Specifications

Reference: People's Daily Online-It is very important to carefully check the quality of wires for electricity safety.