Pressures Developed by Arcs

Along with the flash burns caused by electric arcs, nearby personnel may sustain injuries from falls and collisions if and when they are propelled by the pressure developed by the arcs. However, the rearward propulsion reduces the extent and degree of arc-blast burns to personnel by increasing their distance from and limiting their exposure to these blasts. Electric arc blasts will also cause damage to nearby structures. A relationship between arc current and pressure for an applicable range of distance is developed. A table for familiarization with some units of the International System of Units (SI) used for pressure is included.