Brief Description of Incident:
A probe on an elbow that was parked “hot” failed when installed into a pad mounted transformer to pick up load on 6 transformers. A flash came out of the switch module to case ground and relayed 80A fuses at termination pole. The worker at the transformer held the elbow in the clear until we opened up the remaining fuse at the pole.
The broken elbow probe was completely unexpected and had probably taken place at time of installation. This may have been prevented by an inspection at time of install or while switching.