Determination of the arc rating(ATPV or EBT50) of flame resistant materials for clothing.
Under this standard the protection property of the fabric or the garment against the thermal effects of an electric arc event is defined as its Arc Thermal Protection Value (ATPV) expressed in cal/cm².
There is no pass / fail criteria under this standard as in case of the Box test. The fabric / garment should have a minimum ATPV rating of 4 cal / cm² according to this standard.
This standard specifies methods to test material and garments intended for use in Heat and Flame resistant clothing for workers exposed to electric arcs.
Protection Class 1 and protection Class 2 are safety requirements covering actual risk potentials due to electric fault arcs.
This standard specifies tests with which it is possible to evaluate materials and protective clothing based on the use of a directed and constrained electric arc under defined laboratory conditions - this is called the Box-test.
For the tests a low voltage procedure is used. The tests can optionally be carried out in two fixed test classes, selected by the amount of prospective short circuit current :
The garments must be used to cover the whole body, e.g. jacket and trousers, to attain the correct level of protection.
The clothing falling under the EN 61482-1-2 is further classified as a Category III product.