UL 499 Figure 7.4 PA180 Test Probe for Hand-Supported Enclosure

UL 499 Figure 7.4 PA180 Test Probe is a specialized safety testing instrument designed for compliance verification of hand-supported enclosures on portable electric heating appliances, including irons, hair dryers, and personal heaters. The probe features a rigid stainless steel construction to simulate accidental user contact during operation, ensuring hazardous live components such as heating elements and internal wiring remain inaccessible through enclosure gaps. Paired with an insulating nylon handle for operator safety, the probe applies a calibrated 10N thrust force to replicate real-world pressure conditions during testing procedures.

Specifications

• Probe Type: UL 499 Figure 7.4 PA180 Test Probe (for hand-supported enclosures of electric heating appliances)
• Probe Material: Stainless steel (rigid, corrosion-resistant; maintains structural integrity under 10N thrust force)
• Handle Material: Nylon (fully insulating, heat-resistant up to 120°C; non-slip grip for controlled operation)
• Key Dimensions:
  • Total length: 50.8 mm (2 inches)
  • Head length: 3.2 mm (1/8 inch)
  • Test Probe Diameter: 6.4 mm (1/4 inch)

Test Procedures

1. Inspect the probe for physical damage (e.g., bent stainless steel body, cracked nylon handle) to ensure measurement accuracy.
2. Power on the hand-supported heating appliance (e.g., iron) and allow it to reach normal operating mode.
3. Hold the insulating handle and align the probe tip with enclosure gaps (e.g., handle seams, control slots).
4. Apply steady 10N thrust force to the probe toward internal components—maintain force for 5 seconds.
5. Check if the probe contacts any hazardous parts (e.g., heating elements, exposed wiring).
6. Record whether the appliance meets UL 499 safety requirements (pass/fail) and power off.

Applications

1. Safety testing of hand-held electric irons (per UL 499:2023 Figure 7.4) to verify enclosure access prevention to heating elements.
2. Quality control for hand-held electric heaters (small personal models) during manufacturing processes.
3. Post-production audits of portable electric soldering irons (hand-supported enclosures) to ensure UL 499 standard compliance.

PA180 Test Probe for Hand-supported Enclosure of UL 499 Figure 7.4