Question

The metal used to coat copper wire to protect it from the attack of sulfur before its insulation​

Answer 1

VIR

• The following are the essential requirements for the cable's insulating materials: good insulating strength to avoid fault currents.
• To avoid electromagnetic breakdown of the cable, it must have a high dielectric strength. Mechanical qualities that are good (tenacity and elasticity).
• The main disadvantage of VIR is that it attacks copper due to the component, hence in cables with VIR insulation, the copper wire is tinned before the insulation is applied.
• To protect the conductor from sulfur, a covering of natural rubber is sometimes applied.