How to quickly identify the quality of THHN stranded wire?

For everyone, safe use of electricity has always been important. High temperature resistant THHN stranded wires have always been used as cables in the construction industry. If the low-quality high temperature resistant THHN cables are easy to bring trouble to our lives and threaten our safety . Therefore, when choosing high temperature resistant THHN cables, be sure to keep your eyes open and avoid choosing inferior high temperature resistant THHN cables. 

Since many customers do not know how to check the specific material of high temperature resistant THHN cables, and they cannot spend a lot of time detecting whether they are inferior, how to quickly identify whether they are inferior high temperature resistant THHN cables? There are several ways here.

There are 6 ways to quickly identify whether THHN cables is high quality

1. Looking at the color of the copper conductor, it is generally stipulated that the copper wire of the high temperature resistant THHN cable conductor must use pure copper oxygen-free copper (called copper in the copper industry), because the copper content reaches 99%, the purity is high, the color is soft, and the oxygen content high.

2. Wipe the copper wire with frosted white paper. If the high temperature resistant THHN cable is unqualified, there are many impurities in the copper wire, and the welding with copper is unstable, and it will leave traces (blackening) on ​​the white paper after wiping.

3. Bend the copper wire conductor back and forth, the pure copper wire is soft, has good tensile strength, and is not easy to break.

4. Observe the surface of the copper high temperature resistant THHN cable. The surface of the copper wire conductor should not have triangles or burrs, cracks, kinks, wrinkles, inclusions, skin spots, pits, mechanical damage, stains, and defects;

5. Measure whether the copper wire is square or not, and the no-voltage thhn cable is easy to detect. Directly measure the copper wire diameter with a caliper and compare according to the THHN cable data sheet. However, there are many shrinking THHN cables on the market, which can be compared with the actual unit weight of THHN cables according to the unit weight of THHN cables or the standard THHN cable parameter table;

6. Check the insulation of the high temperature resistant THHN cable. Whether the surface of the sheath is smooth and round, whether the luster is uniform, and whether there are visible bubbles, burns, etc. The thickness should be uniform, there should be no eccentric core, no mechanical damage and flattening phenomenon, each layer of material should be non-stick, fully filled, the cable should be round, and the bent cable should not be prone to white marks.

All in all, high-quality high-temperature THHN cables, conductors, and insulation have fine workmanship, while inferior products are much worse in this regard, especially the conductors. For our safety, we should choose regular manufacturers to buy THHN cables.