UL 749 Figure 9.2 SB0504A Accessibility Knife Probe
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The UL 749 Figure 9.2 SB0504A Accessibility Knife Probe is a specialized safety testing instrument engineered to evaluate the accessibility of hazardous components within industrial control equipment. It incorporates a thin, rigid stainless steel knife-shaped tip, specifically designed to penetrate narrow gaps and crevices in control panels or enclosures that conventional probes cannot access. Equipped with an insulating nylon handle to ensure operator safety, this probe applies a calibrated 50N thrust force to simulate moderate external mechanical stress, thereby verifying whether live conductors or moving parts remain inaccessible. Manufactured in strict compliance with UL 749 requirements, this instrument exhibits exceptional durability and dimensional stability, serving as a critical tool for manufacturers to validate that industrial equipment meets U.S. safety compliance standards, including alignment with IEC 61010-1 and GB 4793.1 for electrical measurement, control, and laboratory use.
Technical Specifications:
• Probe Type: UL 749 Figure 9.2 SB0504A Accessibility Knife Probe
• Knife Tip Material: Stainless steel (thin, rigid, corrosion-resistant; maintains precise edge geometry for gap penetration)
• Handle Material: Nylon (fully insulating, heat-resistant, non-slip surface for controlled force application)
• Key Dimensions:
– Knife Tip Width: 6 mm ± 0.1 mm
– Knife Tip Thickness: 1 mm ± 0.05 mm
– Effective Tip Length: 50 mm ± 0.2 mm
– Handle Length: 130 mm ± 0.5 mm
– Total Length: 180 mm ± 0.5 mm
• Applied Thrust Force: 50N ± 1N (simulates moderate mechanical force on narrow apertures in industrial enclosures)
• Core Function: Verifies the inaccessibility of hazardous live or moving parts within narrow gaps of industrial control equipment, in accordance with UL standards and related international norms.
Standardized Test Procedures:
• Conduct a preliminary inspection of the probe to ensure the knife tip is not bent, the handle is free of cracks, and all connections are secure. Verify thrust force calibration using a certified force gauge.
• Energize the industrial control equipment under test and allow it to reach its normal operating condition.
• Grasp the insulating handle and precisely align the knife tip with the narrow gap or aperture to be tested (e.g., panel seams, button slots, ventilation openings).
• Apply a steady 50N thrust force to the probe, maintaining this force for a duration of 5 seconds as specified by standard test protocols.
• Observe and document whether the probe tip makes contact with any hazardous components, such as exposed live conductors, relay contacts, or moving mechanical parts.
• Record the test outcome (pass/fail) based on the equipment’s compliance with the specified safety accessibility requirements.
Primary Applications:
• Safety compliance testing of industrial control panels and automation controllers, specifically per UL 749:2023 Figure 9.2 requirements.
• Accessibility verification for motor control centers (MCCs) and switchgear assemblies to ensure live parts are not accessible through narrow gaps.
• Safety evaluation of non-patient-contact medical electrical equipment, such as laboratory sample processors, in compliance with UL 61010-1:2023 / IEC 61010-1:2023.
• Quality assurance during the manufacturing of industrial sensor enclosures (e.g., for temperature, pressure, or flow sensors).
• Post-production safety audits of automated assembly line control units to confirm adherence to U.S. and international industrial safety standards.
UL 749 Figure 9.2 SB0504A Accessibility Knife Probe
Tags：SMT-SB0504A , UL 749