UL 1017 Figure 25 Accessibility Probe

Product No: SMT-SU0252

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Description

The UL 1017 Figure 25 Accessibility Probe is a specialized safety tool designed for electrical equipment in commercial and industrial settings—such as transformers, power supplies, and industrial control enclosures. It’s engineered to test if hazardous live parts (e.g., high-voltage terminals, exposed windings) are accessible through equipment openings, vents, or panel gaps. Featuring a rigid, conductive stainless steel tip (matching UL 1017’s precise dimensions) and a heat-resistant insulated handle, it applies a controlled 50N thrust to simulate firm accidental contact. Strictly compliant with UL 1017, it ensures equipment meets U.S. safety standards for preventing electric shock, making it essential for manufacturers targeting North American markets.

Standards:

Standards No.	Clause/Figure	Standards Name
UL 1017:2023	Clause 12.5, Figure 25	Standard for Safety for Transformers, Power Supplies, and Reactors
IEC 61558-1:2020	Clause 10.3, Figure 10.3	Power transformers, power supplies, reactors and similar products for supply voltages up to 1 100 V – Part 1: General requirements and tests
UL 60950-1:2023	Clause 6.2.1, Figure 6.2.1	Standard for Safety for Information Technology Equipment – Safety – Part 1: General Requirements

Specifications:
Tool Type: UL 1017 Figure 25 Accessibility Probe (for transformers/power supplies hazardous part testing)
Probe Material: Conductive stainless steel (resistance ≤ 0.1Ω; corrosion-resistant; rigid, no deformation under 50N force)
Handle Material: Fiberglass-reinforced plastic (FRP) (fully insulated, resistance ≥ 100MΩ; heat-resistant up to 150°C; ergonomic grip for stable force application)
Key Dimensions:
– Probe Tip Diameter: 12mm ± 0.1mm
– Probe Length: 150mm ± 0.2mm
– Handle Length: 180mm ± 0.5mm
– Total Length: 330mm ± 0.5mm
Applied Thrust: 50N ± 5N (standard for UL 1017 testing; simulates firm accidental contact with industrial equipment)
Core Function: Detects accessible hazardous live parts in transformers/power supplies; verifies compliance with UL 1017’s safety requirements

Test Procedures:
1. Inspect the probe for damage (bent tip, cracked insulation, poor conductivity) and confirm rigidity.
2. Power on the equipment under test (EUT, e.g., industrial transformer) and set it to normal operating mode.
3. Hold the insulated handle, align the 12mm probe tip with EUT openings (e.g., vent slots, terminal panel gaps).
4. Apply a steady 50N thrust to the probe—advance until resistance from the enclosure or internal components stops insertion.
5. Check the connected live-part detection instrument for signals (indicating contact with hazardous parts).
6. Record results: Pass if no contact; Fail if live parts are accessible.

Applications:
1. Testing vent slot gaps in industrial transformers (per UL 1017:2023 Figure 25) to block access to high-voltage windings.
2. Verifying terminal panel openings in commercial power supplies (compliant with IEC 61558-1:2020) for electric shock prevention.
3. Safety checks for IT server power supply enclosures (per UL 60950-1:2023) to protect technicians from live components.
4. Quality control for medical device power transformers (e.g., MRI machine power units) during manufacturing.
5. Post-production testing of industrial control enclosure gaps to meet North American electrical safety standards.