Читать книгу Arc Flash Hazard Analysis and Mitigation - J. C. Das - Страница 21

Apart from thermal burns, an arcing phenomenon is associated with other hazards too, namely:

 electrical shock

 molten metal

 projectiles

 blast and pressure waves

 intense light

 intense sound

 fire

 effect of strong magnetic fields and plasma, of which not much is known

 toxic gases and vapors.

Thus, thermal burns due to arc flash are only a part the picture for overall worker safety. Figure F.1a,b in NFPA 70E [17], not reproduced here, provides hazard risk analysis procedure flowchart. It implies that each establishment must perform a number of tasks and establish training and safety procedures that should be implemented for workers’ safety. The numbers of injuries from arc flash accidents are high (see Chapter 2). IEEE 1584 Guide documents many such cases.

This book is confined to the analysis of arc flash thermal damage and calculation of arc flash boundary, subsequently defined, according to IEEE 1584 Guide equations. The book concentrates on the various design, planning, and protection strategies by which the arc flash hazard can be reduced.