UL 921 Figure 3 PA140B Test Probe for Film-Coated Wire Insulation Integrity

UL 921 Figure 3 PA140B Test Probe for Film-Coated Wires is a specialized safety instrument engineered to verify the insulation integrity of film-coated electrical wires, essential for detecting microscopic cracks, pinholes, or coating damages that could lead to electrical leakage. It incorporates a conductive brass probe tip for precise surface contact and an insulating nylon handle to safeguard operators from electrical shock. Designed to apply minimal, controlled pressure, it replicates operational conditions while adhering strictly to UL 921 specifications. Constructed for durability and dimensional stability, this probe is indispensable for manufacturers and testing laboratories to ensure film-coated wires comply with U.S. safety standards for scientific, industrial, and medical auxiliary equipment.

Specifications:

• Probe Type: UL 921 Figure 3 Test Probe (for film-coated wire insulation integrity testing)
• Probe Tip Material: Brass (high conductivity for reliable contact, corrosion-resistant)
• Handle Material: Nylon (fully insulating, heat-resistant, non-slip for precise pressure control)
• Key Dimensions:
  • Probe Tip Diameter: 1.5 mm ± 0.05 mm (optimized for small-diameter film-coated wires)
  • Effective Probe Length: 25 mm ± 0.2 mm
  • Handle Length: 100 mm ± 0.5 mm
  • Total Length: 125 mm ± 0.5 mm
• Electrical Conductivity: Probe tip resistance ≤ 0.1 Ω (ensures accurate leakage detection)
• Applied Force: Negligible force (light contact only to prevent damage to intact film coatings)
• Core Function: Detects insulation defects (cracks, pinholes) in film-coated wires per UL 921 standards

Test Procedures:

1. Inspect the probe for integrity (no bent tip, cracked handle, or conductivity issues) and connect it to a leakage detection instrument.
2. Prepare the film-coated wire by ensuring it is clean, dry, and positioned on a non-conductive surface.
3. Grip the insulating handle and align the brass probe tip with the wire’s film coating.
4. Apply light, uniform contact (without force) to glide the probe along the wire’s length.
5. Monitor the detection instrument for indications of insulation breaches, as per UL 921 protocols.