Ls International Limited

Telephone 01902 497 626

Electric Arc Protection

Electric Arc Protection

What is an “Arc”?

Essentially an electric arc is the spark that jumps between any gap created in an electrical system:  this can be the bolt of lightning jumping between a cloud and a point on Earth or more usually the tiny spark that can occur when a light switch is flicked on or off, which is why you should not use any switching if you suspect  a gas leak !!!

Electric Arc testing

In Europe the arc standards are the IEC 61482 series, these are outlined below:-

IEC 61482-2:2009 Live working – Protective clothing against the thermal hazards of an electric arc – Part 2: Requirements

IEC/EN 61482-1-1: 2009 Live working - Protective clothing against the thermal hazards of an electric arc - Part 1-1: Test methods - Method 1: Determination of the arc rating (ATPV or EBT50) of flame resistant materials for clothing.

IEC/EN 61482-1-2:2007 Live working — Protective clothing against the thermal hazards of an electric arc — Part 1-2: Test methods — Method 2: Determination of arc protection class of material and clothing by using a constrained and directed arc (box test)

IEC 61482-1-2 "Box Test"

The box test is currently the official test method for "CE" certification and the way that the European standard uses to measure the protective performance of clothing against the thermal effects of an electric arc. In this test, the fabric is exposed to an electric arc confined in a specific box with a specific electrode arrangement. This special box design realises, in opposite to an open arc test, a constrained direct exposure of the fabric.

 

Box Test         

Arc Duration     

     Arc Test Current     

     Incident Arc Energy

Class1

     0.5 s

     4kA

      135 kJ/m²

Class 2 

     0.5 s

     7kA

     423 kJ/m²