UL 1017 Figure 25 Accessibility Probe

This accessibility probe is engineered and manufactured in strict compliance with UL 1017:2018 Figure 25 and Figure 26, CSA C22.2 No.243-17, and related international safety standards. Its dimensional specifications are calibrated to simulate the anthropometric measurements of the 13-18 month age demographic (both male and female percentiles). This standardized test probe is utilized to evaluate whether simulated limb access can contact operational components (including rotors, pulleys, belts, gears, and other moving parts) within electrical enclosures during normal equipment operation. The probe features a rigid, electrically conductive stainless steel tip manufactured to UL 1017’s precise dimensional tolerances, coupled with a heat-resistant, electrically insulated handle for operator safety.

Specifications:

• Tool Type: UL 1017 Figure 25 Accessibility Probe (for transformer/power supply hazardous part accessibility testing)
• Key Dimensional Parameters (13-18 month bracket):
  • Upper arm circumference (female, 5th percentile): 11.9 cm (4.685 in)
  • Shoulder to elbow length (male, 95th percentile): 16.8 cm (6.61 in)
  • Forearm circumference (female, 5th percentile): 12.1 cm (4.76 in)
  • Lower arm length, elbow to fingertip (male, 95th percentile): 22.7 cm (8.94 in)
  • Minimum hand clearance diameter (female, 5th percentile): 3.49 cm (1.374 in)
  • Hand length (male, 95th percentile): 10.2 cm (4.016 in)
  • Middle finger length (male, 95th percentile): 4.5 cm (1.772 in)
  • Middle finger diameter (female, 5th percentile): 0.79 cm (0.311 in)
• Note: All dimensional parameters correspond to the 13-18 month age demographic, encompassing both male and female anthropometric data.
• Probe Material: Stainless steel (conductive tip)

Standardized Test Procedure:

1. Conduct a visual and functional inspection of the probe assembly. Verify the absence of damage (e.g., tip deformation, insulation compromise, conductivity degradation) and confirm structural rigidity.
2. Power on the Equipment Under Test (EUT), such as an industrial transformer or power supply, and establish normal operating conditions.
3. Securely grip the insulated handle. Align the 12mm probe tip with designated EUT access points (e.g., ventilation apertures, terminal panel gaps, enclosure openings).
4. Apply a consistent 50 Newton (N) axial thrust force to the probe. Advance the probe until mechanical resistance from the enclosure or internal components prevents further insertion.
5. Monitor the connected live-part detection instrumentation for electrical continuity signals, which indicate contact with hazardous live parts or moving components.
6. Document test results per standard protocol: Pass if no electrical contact is detected; Fail if the probe makes the hazardous parts accessible.

Primary Applications:

1. Accessibility testing of ventilation slot clearances in industrial transformers and power supplies (per UL 1017, IEC 62368-1).
2. Verification of enclosure gap dimensions in motor-driven appliances to prevent limb access to hazardous moving parts.
3. Compliance testing for household and commercial electrical equipment requiring protection against accidental contact (aligned with CSA, GB/T, and ISO safety standards).
4. Quality assurance validation in manufacturing environments to ensure product designs meet specified safety clearance requirements.