EWIS Wiring Insulation Breakdown Testing

Standardization of Electrical Wiring Interconnect Systems (EWIS) insulation breakdown testing for aerospace systems is critical for safety of maintenance personnel and preservation of aircraft systems. Reliable electrical insulation is a critical component of EWIS airworthiness. Wire insulation is constantly stressed over its life. Dirt, moisture, various fluids, corrosion, vibration, electrical spikes and surges, mechanical stresses from pulling and tugging, and many other factors add up to further deteriorate insulation. This can be instantaneous, but is more likely to be a slow and steady decline over time. The remaining life of the insulation could be measured in years, or it could break down at the next startup. Hipot (high potential voltage testing) or insulation breakdown testing can assist in finding wiring faults when electrical systems or components are functioning intermittently due to a wiring faults. This ARP provides guidance in effective and safe ways of performing insulation break down testing (hipot) through the use of a Low-Energy High Voltage (LEHV) signal, which induces a spark at a defect location. As with all wire test methods, adherance to recommended process and understanding the limitations of the test equipment and unit under test is pivotal to personnel safety and test outcome.

ARP6216 has been reaffirmed to comply with the SAE Five-Year Review policy.