1. What is the diameter of 2.5 square copper core?

The diameter of 2.5 square copper core is 1.78 mm.. 2.5 square copper core means that the cross-sectional area is 2.5 square millimeters. According to the formula area S=3.14× radius r× radius R, it can be obtained that the radius of copper core r= root number (2.5÷3.14)=.89, and the diameter d=2× radius r=2×.89=1.78 millimeters.

2. How to choose copper core wire

1. Manufacturer's choice

Wires and cables belong to 3c national compulsory certification products, please choose products with this logo. Check the specifications, implementation scale, nominal voltage, length, date, factory name and address on the certificate, as well as the serial numbers of production license and quality system certification; See if the trademark, specification, voltage, etc. are printed on the cable.

2. Check the size of copper-core wire

According to relevant requirements, the cable length error should be within 2% and the cable section diameter should be within .2%. The copper core with good quality is purple, shiny and smooth. The copper core of fake and inferior copper core cable is purple-black, light yellow or white.

3. Selection of current carrying capacity

In terms of electric load, the current carrying capacity of copper core wire with 1.5 ~ 1mm2 is 5 times of the cross-sectional area, and that of copper core wire with 6 ~ 25mm2 is 4 times of the cross-sectional area.

4. Look at the insulating rubber

The insulating layer of fake and inferior cables gives people a thick feeling, but in fact most of them are made of recycled plastics. All cables must pass through the PVC conduit with flame retardant characteristics, which will have better safety performance and ensure normal use in the future.