IEC 61482-1-2 - Box Testing

The box method is performed using a plaster box to focus a short arc toward a panel of fabric or a garment. There are two exposures: 4000 A, 0.5 second (Class 1) and 7000A, 0.5 second (Class 2). The requirements below must be met to pass testing and the end result is a classification of 1 or 2. Testing is performed in accordance with IEC 61482-1-2 Live working–Protective clothing against the thermal hazards of an electric arc, Part 2 Requirements. This method assigns one of the two Arc Protection Classes (APC) above. This may be used to correlate to any energy level below that of the highest APC.

Box Test Method Acceptance Criteria:

  • No melting through to the inner side
  • Afterflame less than or equal to 5 seconds
  • No hole larger than 5mm in any direction
  • All 8 value pairs in testing must be below the Stoll Curve in the tests of the selected APC

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