UL 1703 Figure 15.1 Test Probe (PA120-1)

The UL 1703 Figure 15.1 Test Probe (PA120-1) is a precision measurement instrument engineered to verify the accessibility of live electrical components in flat-plate photovoltaic (PV) modules and panels—a critical safety assessment for preventing electric shock hazards in solar energy systems. This instrument incorporates a 12mm knurled stainless steel test finger (80mm length) that simulates human contact, coupled with a 50mm diameter baffle plate to prevent over-insertion during testing procedures. The jointed mechanical design enables 360° rotation and 90° ± 10° angulation during deployment, facilitating access to gaps in PV components (e.g., junction boxes, panel seams) while maintaining minimal applied force to prevent material damage.

This test probe demonstrates compliance with multiple international safety standards including UL 1703, CSA C22.2 No. 107.1, and IEC 61730, making it essential for PV manufacturers to validate product safety and meet global regulatory requirements for solar equipment. The instrument’s construction features corrosion-resistant stainless steel with electrical resistance ≤ 0.1Ω and insulated plastic components with handle resistance ≥ 100MΩ, ensuring durability and electrical safety during repeated testing cycles.

Technical Specifications:

• Tool Type: UL 1703 Figure 15.1 Test Probe (for live part accessibility testing in flat-plate PV modules/panels)
• Test Finger Material: Knurled stainless steel (resistance ≤ 0.1Ω; corrosion-resistant; durable for repeated use on PV components)
• Handle/Baffle Material: Insulated plastic (handle resistance ≥ 100MΩ; heat-resistant up to 120°C; baffle plate for over-insertion protection)
• Key Dimensions:
  • Knurled Finger Diameter: 12mm ± 0.1mm
  • Knurled Finger Length: 80mm ± 0.2mm
  • Baffle Plate Diameter: 50mm ± 0.2mm
  • Baffle Plate Length: 100mm ± 0.2mm
  • Baffle Plate Thickness: 20mm ± 0.1mm
  • Total Length (Probe + Handle): 300mm ± 0.5mm
• Joint Characteristics: Jointed design; 360° rotation and 90° ± 10° angling (to navigate PV component gaps); no deformation under minimal test force
• Applied Force: Minimal force (≤5N) – sufficient to determine accessibility without damaging PV module materials (per UL 1703 requirements)
• Core Function: Detects accessible live parts in PV modules/panels; simulates human contact via knurled finger; ensures compliance with solar safety standards
• Test Procedures:
  1. Inspect the probe for bent fingers, loose joints, or cracked insulation; confirm conductivity with a test tool.
  2. Place the PV module/panel under test (EUT) on a flat, non-conductive surface in the test environment.
  3. Apply the test probe to all accessible openings in the PV module/panel with minimal force (≤5N).
  4. Rotate and angle the jointed probe as necessary to navigate component gaps and seams.
  5. Monitor for electrical contact between the test finger and live parts using appropriate detection equipment.
  6. Document all test results for compliance verification against UL 1703, CSA, and IEC standards.