What should be inspected on power cables before applying external power?

• A. Inspect power cables and cable assembly for corrosion
• B. Inspect power cables for insulation damage only
• C. Inspect power cables for connector wear only
• D. Inspect for color and length

Answer: (A)

Before applying external power, you must ensure a solid electrical path by inspecting for corrosion on power cables and their assemblies. Corrosion at connectors and terminations raises resistance, causes heat buildup, and can create arcing when power is applied. This combination not only risks damage to equipment and fire but can also hide other damage along the power path. While insulation damage and wear are concerns, corrosion directly jeopardizes the integrity of the electrical connection and is the most critical issue to verify. Checking color or length doesn’t reveal these electrical risks, and focusing only on wear or insulation would miss corrosion at mating surfaces or inside the cable assembly. If corrosion is found, de-energize and follow the maintenance procedure to clean or replace the affected cable and connectors, then recheck for a clean, secure connection before applying power.