UL 639 Figure 7.4 Accessibility Probe

Specifications:
Tool Type: Accessibility Probe (UL 639 Figure 7.4; for hazardous part testing in electric kitchen appliances)
Material: stainless steel and nylon
Key Dimensions:
– Test finger diameter: 25.4 mm (1 inch)
– Test finger length: 101.6 mm (4 inch)
– Head radius: R12.7 mm (1/42 inch)
– Tail diameter: 31.75 mm (1-1/4 inch)
Applied Thrust: 15N ± 1N (simulates accidental user contact with kitchen appliances; aligns with UL 639 requirements)
Core Function: Tests access to hazardous live/moving parts in kitchen appliances; prevents over-insertion via stop face; ensures UL compliance

Test Procedures:
1. Inspect the probe for bent tips, cracked insulation, or loose stop faces; confirm conductivity with a test tool.
2. Power on the kitchen appliance under test (EUT, e.g., electric skillet) and set it to normal operating mode.
3. Hold the insulated handle, align the 6mm tip with EUT gaps (control knob seams, heating element covers).
4. Apply steady 15N thrust to advance the probe—stop if the 38mm stop face touches the EUT.
5. Check the connected live-part detector for signals (indicating contact with hazardous parts).
6. Record results: Pass if no contact; Fail if the probe reaches dangerous components.

Applications:
1. Testing access to heating element terminals in countertop ovens (per UL 639:2023 Figure 7.4) to prevent electric shock.
2. Verifying control panel gaps in electric skillets (compliant with UL 60335-1:2023) to block contact with internal wiring.
3. Safety checks for food processor blade housing seams (per UL 639-2-1:2023) to avoid injury from moving parts.
4. Quality control for electric grills during manufacturing, ensuring UL 639 compliance for hazardous part protection.
5. Post-production testing of toaster oven door hinges to meet global electric kitchen appliance safety standards.