IEC 61482-2/CDV "Box Test" There are no products.

The box test is another way to measure the protective performance of clothing against the thermal effects of an electric arc, and is defined in the IEC 61482-1-2 test method. In this test, the fabric is exposed to an electric arc confined in a specific box with a specific electrode arrangement.

Box Test
Arc Duration = 0.5 s
Arc Current = 4kA
Class1 = 4kA
Class 2 = 7kA

A fabric passes the test:
• If the heat transferred behind the fabric does not cause second degree burn (i.e. is below the Stoll curve)
• If the after flame time is below 5 seconds
• If there is no melting to the inner side of the fabric
• If a hole caused by the arc is not larger than 5 mm in every direction (in the inner most layer)Test conditions for Class 1 try to simulate typical exposure conditions for a short circuit current of 4 kA protected by devices limiting the duration of the arc to 0.5 seconds in confined space, and of 7 kA respectively for Class 2.

Please note:
This box test method should be referred to for Low Voltage Systems only.
For instance to replicate potential hazards in;
service entrance boxes, cable distribution, cabinets, distribution substations or comparable installations, where arc is directed to the front of a worker at the height of the breastbone
It is the opinion of UK technical committee PEL/78 that the “box test” does not provide the user with a realistic and reliable test. A premise of this test is that the fault currents will not exceed 4000 A or 7000 A and the worker will not be closer than the specified distance from the arc (in reality this cannot be guaranteed).
The energy on the worker’s body is directly proportional to the length of the arc, the current and the duration of the arc. For example, if a worker positioned at 60cm from the arc and is exposed to 4 cal/cm2 at 30cm from the arc the energy will be approximately16 cal/cm2. Experience in the field has shown that hazards can range in strength starting from 3 or 4 cal/cm2 to levels higher than 40 cal/cm2.
UK technical committee PEL/78 believes that open arc test will provide the best way to determine whether a particular material will provide the best protection for the worker for any given job.

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