UL 1278 Figure 8.2 PA140A Insulation Integrity Probe for Enameled Wiring

Specifications:
Probe Type: UL 1278 Figure 8.2 PA140A Probe (for insulation integrity testing in electric tool wiring)
Handle Material: Nylon (fully insulating construction, heat-resistant to 100°C; non-slip grip for precise pressure application)
Key Dimensions:
– Total Length: 101.6mm (4 inch)
– Head Diameter: 12.7mm (1/2 inch)
– Former Head Radius: 6.4mm (1/4 inch)
– Tail Diameter: 19.1mm (3/4 inch)
– Compliance Standards: UL398 Fig 8.2 (PA170B), UL507 (PA170D), UL749 Fig 2, UL982 Fig 58.6 and UL1278 Fig 8.2 (PA140A)

Test Procedures:
1. Conduct visual inspection of the probe (verify absence of bent tip, handle cracks, or conductivity issues) and establish connection to a wire leakage detection instrument.
2. Remove the electric tool’s outer casing to access internal enameled wiring; ensure wiring surfaces are clean and dry.
3. Grasp the insulating handle and align the 0.8mm brass tip with the enameled wire surface.
4. Guide the probe smoothly along the wire length, concentrating on high-stress regions (e.g., motor connection points).
5. Monitor the detection instrument for electrical signals (indicating coating damage and potential leakage).
6. Document defective wire sections and determine compliance with safety requirements (pass/fail assessment).

Applications:
1. Safety compliance testing of enameled wiring in hand-held electric drills (per UL 1278:2023 Figure 8.2 requirements).
2. Verification of sanding tool enameled wiring for U.S. retail market compliance to prevent electrical leakage hazards.
3. Manufacturing quality control for electric screwdriver internal wiring systems.
4. Post-production audits of cordless rotary tool enameled wiring to ensure UL 1278 safety standard compliance.