UL 921:2016 Figure 2 PA130B Accessibility Test Probe for Uninsulated Live Parts

This UL 921:2016 Figure 2 Accessibility Test Probe for Uninsulated Live Parts is a specialized safety verification instrument designed for scientific apparatus, laboratory equipment, and precision measurement devices. It incorporates a highly conductive brass probe tip engineered to detect accessible uninsulated live components—essential for compliance verification that energized conductive parts (e.g., internal wiring, terminal blocks, bus bars) remain inaccessible to operators during normal operation. Paired with a robust insulating nylon handle (providing electrical isolation to protect testing personnel from electric shock hazards), it applies controlled, minimal pressure to simulate inadvertent human contact scenarios.

Specifications:
Probe Type: UL 921:2016 Figure 2 Probe (for uninsulated live part accessibility testing in scientific and laboratory equipment)
Handle Material: Nylon (fully insulating, heat-resistant to 100°C; ergonomic non-slip grip for precise operational control)
Key Dimensions:
– Straight Finger Diameter: 12.7mm (1/2 inch)
– Straight Finger Total Length: 101.6mm (4 inch)
– The Head Length: 14.3mm (9/16 inch)
– The Head Radius: R 4.8mm (3/16 inch)
– The Tail Diameter: 19.1mm (3/4 inch)

Test Procedures:
1. Conduct visual inspection of the probe assembly (verify brass tip integrity, handle condition, and electrical continuity) and connect to appropriate live part detection instrumentation.
2. Energize the scientific equipment under test and allow stabilization to normal operating conditions (e.g., calibration mode, measurement state).
3. Grasp the insulating handle and position the probe tip at potential access points (e.g., terminal gaps, ventilation apertures, panel openings).
4. Apply gentle contact pressure to the target area—avoid excessive mechanical force.
5. Monitor detection instrumentation for electrical contact signals (indicating accessibility to uninsulated live parts).
6. Document test results: compliance achieved if no live part contact detected; non-compliance if electrical contact is established.

Applications:
1. Safety compliance testing of laboratory centrifuges and spectrometers (per UL 921:2016 Figure 2 requirements) to prevent operator access to live parts.
2. Verification of non-patient-contact medical laboratory equipment (e.g., sample preparation systems, analyzers) for North American market safety certifications.
3. Quality assurance protocols for precision scientific balances and measurement instruments during manufacturing processes.
4. Post-production safety audits of laboratory power supplies and signal generators… (truncated)