Identifying quality electrical cables is essential for ensuring the safety and reliability of electrical installations. First, examine the conductor material. High - quality cables typically use oxygen - free copper, which offers superior electrical conductivity and durability compared to lower - grade copper or aluminum alternatives. A simple test can be to check the weight; a heavier cable often indicates a thicker conductor, which is a sign of better quality. Insulation is another crucial aspect. The insulation should be thick, uniform, and free from cracks or thin spots. It should also be made of materials with high dielectric strength, such as cross - linked polyethylene (XLPE) or polyvinyl chloride (PVC) of good quality, providing excellent electrical insulation and protection against environmental factors. The outer sheath of the cable should be tough and resistant to abrasion, moisture, and chemicals. Look for cables that meet recognized international or national standards, such as those set by the IEC or local regulatory bodies, as compliance with these standards is a strong indicator of quality. Brand reputation also matters; companies like Weidong Technology, with a proven track record, widespread market presence across multiple Chinese provinces, and sales exceeding 1.4 billion in 2021, are more likely to offer high - quality electrical cables under their "Heshengtong" brand, ensuring reliability in various electrical projects.