How big is the difference between the measured standards of wires and cables

What are you asking?

For example, insulation, sheath thickness. There is a minimum point requirement in the standard. As long as any point in the insulation and sheath is not less than the thickness of the thinnest point. The average thickness is not less than the nominal thickness. It is considered that the insulation and sheath of the wire are qualified.

Do you mean monofilament diameter? There is no specific provision for this, and generally only the conductor resistance is qualified.

Finished cable: 1The size of the conductor is generally not specified, but the minimum DC resistance at 20 degrees is specified;

2.The insulation and sheath specify the nominal thickness and the thickness of the thinnest point, which is the minimum value, but the unit with a high level of craftsmanship makes full use of the digital modification method and concentricity (not eccentricity) to make the nominal thickness lower than the nominal value specified in the standard, and sometimes it is also qualified;

3.The coverage rate of the bag and strap is greater than or equal to 15%; If the flexibility of the strip is good, it can also be greater than or equal to 10%, as long as the plate is bent and the mouth is not opened.

4.Shielding: Wrapping type with 3, the general standard of braiding type stipulates that the braiding density is not less than 80%, because 80% is calculated, the human error is large, and the diameter of the braided material used is also error, so some factories only do 75% of the transfer impedance is also qualified.

Lower than the above size, afraid of not meeting the product standards, I understand that "normal" is at least in line with the standard, if you encounter actual problems, welcome to the common **, my.

What is the standard, the standard is the lowest difference.

Hello The industry generally stipulates that the measurement tolerance of this specification is positive or negative, the diameter of the single wire is, and the key deficiency qualified range is. (But if it is a good point, electrolytic copper can be lower, so it is recommended to detect the DC resistance project). For the thickness of the plastic is required to insulate the thickness is, any bright excitation point can be less than this thickness but can not be less than this is the standard requirement), that is, the thickness can be less than greater than the thickness of the wire at a certain point, so the general detection of six points on the wire week, the average value should be greater than or equal to that is, that is, qualified, on the contrary, the socks are unqualified.

Summary. Different standards are different, and some standards do not specify the wire diameter, but specify the minimum average thickness of the thickness and the minimum thickness at any point. The national standard also has no wire diameter tolerance, only the minimum and maximum wire diameter.

Ensure that the transmitted current or electromagnetic wave and light wave only travel along the wire and do not flow outside, and the potential on the conductor can be isolated, that is, it is necessary to ensure the normal transmission function of the wire, and to ensure the safety of external objects and people. Wire and insulation are the two basic components that must be present in a cable product.

What is the allowable error of wire diameter of wire and cable?

Different standards are different, and some standards do not specify the wire diameter, but specify the minimum average thickness of the thickness and the minimum thickness at any point. The national standard also has no wire diameter tolerance, only the minimum and maximum wire diameter. Ensure that the transmission line contains clear current or electromagnetic waves, light waves only along the wire and do not flow to the outside, and the potential energy on the conductor is isolated, that is, to ensure the normal transmission function of the wire, but also to ensure the safety of external objects and people.

The conductor and the shelf leading edge layer are the two basic components that make up the cable product.

According to GB T3953 conductor regulations, the allowable deviation range of wire and cable diameter is 1%D, and the line marking wire diameter is 90% of the national standard wire diameter. For the thickness of the plastic is required to insulate the thickness is, any point can be less than this thickness but can not be less than this is the standard requirement), that is, there can be a thickness of less than greater than the wire at a certain point, so the general detection of six points on the wire week, take the stool to do the average value of the file is greater than or equal to the qualified, otherwise unqualified.