UL 1278 Figure 8.2 PA140A Probe for Film-coated Wire

Product No: SMT-PA140A

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Description

The UL 1278 PA140A Enameled Wire Probe is a specialized safety tool designed to test the insulation integrity of enameled (varnished) wires in portable electric tools—such as drills, grinders, and sanders. It features a ultra-thin, highly conductive brass probe tip to detect tiny cracks, pinholes, or wear in enamel coatings (which could cause electric leakage) without damaging intact insulation. Paired with an insulating nylon handle to protect testers from shock, it applies light, controlled pressure to mimic real-world wire stress. Strictly aligned with UL 1278 requirements, it’s compact, durable, and critical for manufacturers to ensure tool wiring meets U.S. safety standards.

Standards:

Standards No.	Clause/Figure	Standards Name
UL 1278:2023	Clause 8.2, Figure 8.2	Standard for Safety for Electric Tools – Part 1: General Requirements
UL 60745-1:2023	Clause 10.3 (References UL 1278 PA140A for enameled wire testing)	Standard for Safety for Hand-Held Motor-Operated Electric Tools – Part 1: General Requirements
UL 60745-2-1:2023	Clause 10.3 (Adopts PA140A probe for drill-specific enameled wire checks)	Standard for Safety for Hand-Held Motor-Operated Electric Tools – Part 2-1: Specific Requirements for Drills and Impact Drills

Specifications:
Probe Type: UL 1278 PA140A Enameled Wire Probe (for insulation integrity testing in electric tool wiring)
Probe Tip Material: Brass (highly conductive, resistance ≤ 0.1 Ω; ensures accurate leakage detection; corrosion-resistant)
Handle Material: Nylon (fully insulating, heat-resistant up to 100°C; non-slip grip for precise pressure control)
Key Dimensions:
– Probe Tip Diameter: 0.8 mm ± 0.05 mm (ultra-thin for small-gauge enameled wires)
– Effective Probe Length: 15 mm ± 0.2 mm (short to avoid bending in tight tool housings)
– Handle Length: 90 mm ± 0.5 mm
– Total Length: 105 mm ± 0.5 mm (compact for testing inside tool casings)
Applied Force: No appreciable force (light contact only; prevents damage to intact enamel coatings)
Core Function: Detects insulation defects (cracks, pinholes) in enameled wires of portable electric tools per UL standards

Test Procedures:
1. Inspect the probe (no bent tip, cracked handle, or poor conductivity) and connect it to a wire leakage detection instrument.
2. Remove the electric tool’s outer casing to access internal enameled wires; ensure wires are clean and dry.
3. Hold the insulating handle and align the 0.8mm brass tip with the enameled wire’s surface.
4. Glide the probe lightly along the wire’s length, focusing on high-stress areas (e.g., near motor connections).
5. Monitor the detection instrument for signals (indicating coating damage and electric leakage).
6. Record defective wire sections and confirm if the tool meets safety requirements (pass/fail).

Applications:
1. Safety testing of enameled wires in hand-held electric drills (per UL 1278:2023 Figure 8.2 & UL 60745-2-1:2023).
2. Compliance checks for angle grinder motor wiring to detect enamel defects per UL 60745-1:2023 Clause 10.3.
3. Verification of sanding tool enameled wires for U.S. retail markets to prevent electric leakage.
4. Quality control for electric screwdriver internal wiring during manufacturing.
5. Post-production audits of cordless rotary tool enameled wires to meet UL 1278 safety standards.