UL 746A High Current Arc Ignition Combustion Testing Equipment
Complied Standards & Clauses
UL 746A “Polymeric Materials - Short Term Property Evaluations” clause 33
UL 746C "Polymeric Materials – Use in Electrical Equipment Evaluations" clause 49
UL 498 "Attachment Plugs and Receptacles" clause 114
IEC 60950-1 “Information technology equipment - Safety - Part 1: General requirements”
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Equipment Overview
Samples and Restrictions: Information technology equipment, low-voltage switchgear and control equipment parts
Application: Suitable for arcing resistance test of electrical and electronic products, household appliances and their materials, simulating possible leakage that caused on the insulator between live parts of different polarities or between live parts and grounded metal parts, used to measure and evaluate the arcing resistance of the insulator under the specified voltage.
Test Principle: The high current arc ignition test apparatus adopts double electrodes, under a specific current (33A) and power factor (COSφ0.5), according to a certain arc ignition speed (254mm/s) and repetition frequency (40 times/min), the arc is repeated to 200 times on the surface of the sample, the high-current arc ignition resistance of the sample is evaluated (HAI) according to whether the sample is ignited or not. The smaller the level number, the harder the material is to be ignited.
Structure: The chamber structure comes with a protective cover.
Technical Parameters
| Control & Operation Method | Electrical control, button operation |
| Arc Ignition Current, Power Factor | When the power factor is 0.5, the current is 33A±0.5A |
| Arc Ignition Rate | 40 times per minute. |
| Electrode Separation Speed | 254±25㎜/S |
| Arc Strike Times | 0-9999 can be preset |
| Electrode Material | Fixed electrode: copper, diameter Ф3.5mm (Ф3.2) × 152mm, top 30° chisel-shaped chisel
Movable electrode: stainless steel, diameter Ф3.5mm (Ф3.2) ×152mm, end cone angle 60° |
| Electrode Angle | At 45° to the level, the radius of curvature of the electrode head is 0.1mm |
| During Test | Automatic control of test program, independent ventilation |
| Lighting | Equipped with a light, with control |
| External Dimension | WDH=800×700×1600mm,300kg |
Details
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UL 746A High Current Arc Ignition Combustion Testing Equipment Images
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