Straight Unjointed Test Finger of IEC 62109-1 Figure D.3

This Straight Unjointed Test Finger (IEC 62109-1 Figure D.3) is a specialized safety tool tailored for photovoltaic (PV) inverters and power conversion equipment. It features a rigid stainless steel “finger” that mimics human finger access—critical for verifying if hazardous live parts or high-voltage components remain inaccessible. Paired with an insulating nylon handle for safe, non-slip operation, it applies a precise 10N thrust to match real-world accidental contact. Strictly aligned with IEC 62109-1 standards, it’s durable, dimensionally stable, and essential for manufacturers/labs to ensure PV equipment safety, eliminating electric shock risks for installers and users.

Standards:

Specifications:
Probe Type: Straight Unjointed Test Finger (IEC 62109-1 Figure D.3 compliant for PV equipment)
Finger Material: Stainless steel (rigid, corrosion-resistant, maintains dimensional accuracy under test conditions)
Handle Material: Nylon (insulating, heat-resistant, non-slip for secure grip during high-voltage equipment testing)
Key Dimensions:
– Finger Diameter: 12 mm ± 0.1 mm
– Effective Finger Length: 80 mm ± 0.2 mm
– Total Length (Finger + Handle): 180 mm ± 0.5 mm
– Finger Tip: Hemispherical, radius 6 mm ± 0.05 mm (smooth to avoid enclosure damage)
Applied Thrust: 10N ± 0.5N (precise force to simulate accidental human contact with PV equipment)
Core Function: Verifies inaccessibility of hazardous live/high-voltage parts in PV inverters and power converters per IEC/UL 62109-1

Test Procedures:
1. Inspect the test finger for damage (e.g., bent steel, cracked handle) to ensure testing accuracy.
2. Power on the PV inverter/power converter and let it reach normal operating mode.
3. Hold the nylon handle and align the straight finger with equipment openings (e.g., vent grilles, terminal covers).
4. Apply steady 10N thrust to the finger toward internal hazardous parts.
5. Check if the finger touches any live/high-voltage components.
6. Record whether the equipment meets safety requirements (pass/fail).

Applications:
1. Safety testing of grid-tied PV inverters (per IEC 62109-1:2022 Figure D.3) to block access to high-voltage parts.
2. Compliance checks for off-grid PV power converters (e.g., solar charge controllers) per UL 62109-1:2023.
3. Verification of residential PV micro-inverters (e.g., module-level inverters) for electric shock protection.
4. Quality control for commercial PV string inverters during manufacturing for global solar markets.
5. Post-production safety audits of PV energy storage converters to meet IEC/UL 62109-1 standards.

Straight Unjointed Test Finger of IEC 62109-1 Figure D.3