More than 2,000 workers are injured yearly in arc-fl ash incidents. One of the most effected areas is in manholes and vaults where there are an abundance of terminations and splices. These confi ned spaces are particularly dangerous due to environmental stresses and contaminations found in these places. Complicating this situation is the congestion, proximity and age of the material found there.
But the most important element contributing to the danger is the fact that there is no way to identify which joint is weak enough to fail so you need to protect against any possibility of failure.