Definition
An electrical insulation test in which a voltage substantially higher than the normal operating voltage is applied between a conductor and ground, or between conductors, to verify that the insulation can withstand voltage stress without breakdown. Used on aircraft wiring, ignition components, and electrical equipment to detect weak insulation, hidden damage, or contamination that could cause arcing or current leakage in service.
Plain English
A safety check where a much higher than normal voltage is briefly pushed through a wire's insulation to make sure the insulation is strong enough and won't leak electricity or short out during use.
Context Anchor
Seen in aircraft electrical maintenance, especially when checking wiring, ignition parts, motors, generators, or other electrical components after repair or inspection.
Derivation
"High-potential" uses "potential" in the electrical sense, meaning voltage (electric pressure between two points). The name simply describes what the test does: applies high voltage. Often shortened in industry to "hipot test."
Why Pilots Care
Confirms that critical electrical systems will not short or arc in flight, directly protecting reliability and safety.
Analogy
It is like pressure-testing a hose with more pressure than it normally carries. If the hose is weak, the test helps reveal the weak spot before it fails in service.
Intuition Check
Potential does not mean possibility here. In this term, potential means electrical voltage, so a high-potential test is a high-voltage insulation test.
Example Sentence 1
After replacing the magneto harness, the technician performed a high-potential test on each lead to confirm the insulation was sound.
Example Sentence 2
All new wiring harnesses receive a high-potential test during the annual inspection.