To hold the conductivity, wires are insulated with a resistant sheathing. Even with this insulation in place, it is possible for some of the electrical current to escape.
Testing can help determine whether the insulation is performing at an effective and safe level, and can identify problems before they result in equipment failure.
To test the integrity of insulation, measuring its resistance to current flow is required:
- A high level of resistance means that very little current is leaking through the insulation.
- A low level of resistance shows a substantial amount of current may be leaking through the insulation.