UL 1278 Figure 10.3 Triangle Probe

This UL 1278 Figure 10.3 Triangle Probe is a specialized safety compliance instrument engineered for portable electric tool testing—including angle grinders, circular saws, and jigsaws. Its precision-machined triangular stainless steel tip is designed to access ultra-narrow gaps (e.g., between tool guards and blades, or around switch housings) that standard round probes cannot penetrate. Paired with an insulating nylon handle for operator safety during simulated accidental contact testing, this probe verifies whether hazardous moving components (e.g., blade shafts, gears) or live electrical parts remain inaccessible according to UL 1278 safety standards.

Specifications:
Probe Type: UL 1278 Figure 10.3 Triangle Probe (for portable electric tool narrow-gap safety testing)
Tip Material: Stainless steel (rigid construction, corrosion-resistant)
Handle Material: Nylon (fully insulating, heat-resistant to 100°C; non-slip grip for precise gap insertion)
Key Dimensions:
– Triangle Base Length: 69.9mm
– Triangle Height: 139.7mm
– Probe Thickness: 1.6mm

Test Procedures:
1. Inspect the probe for damage (bent tip, cracked handle) and confirm triangular geometry integrity.
2. Power on the electric tool and activate its moving components (e.g., saw blade, grinder wheel).
3. Hold the insulating handle and align the triangle tip with ultra-narrow gaps (e.g., guard-blade seams).
4. Apply steady 10N thrust force to the probe—discontinue if resistance from internal components is detected.
5. Verify whether the tip contacts moving components (blades, gears) or live conductors.
6. Document pass/fail results and de-energize the tool.

Applications:
1. Safety compliance testing of angle grinder guard-blade gaps (per UL 1278:2023 Figure 10.3) to prevent gear access.
2. Verification of jigsaw blade guide gaps to ensure moving linkage components remain inaccessible.
3. Quality control testing for belt sanders (narrow guard gaps around sanding belts) during manufacturing processes.
4. Post-production audits of reciprocating saws to confirm compliance with UL 1278 narrow-gap safety requirements.

Triangle Probe of UL1278 Fig.10.3 Tags： SMT-SM208 , UL 1278