Can the following be caused by short circuit without any arc flash? There was an initial short between lugs and chassis. Did arc flash occur that caused the lugs to melt. Or can it melt just by the huge current during the short circuit?
In the above. The live wire was lowered by the electrician to the terminal. Then somehow it shorted (between the 208v wire and neutral/chassis ground) causing the breaker lugs to melt and a hole to be produced at the chassis at the back. This also caused a rat size 2nd degree burn in the electrician arm. Was this caused by short circuit without arc flash or was it arc flash?