Several years ago, when I was serving as chief investigator for the NIOSH-funded Missouri Occupational Fatality Assessment and Control Evaluation Program, I was called to a scene where a 39-year-old journeyman lineman had been electrocuted while working for an electrical contractor. At the time of the incident, the lineman, his co-worker and the foreman had been working at an electrical substation. The city that owned the substation was in the process of switching their electrical service from a three-phase 4-kV system to a 12-kV system. There were several feeders on the structure, but only one was energized to provide service to the city. The lineman and his co-worker were on the steel framework of the substation when the lineman proceeded to work his way over to the incident point. He sat down on the structure next to the energized feeder and energized lightning arrestor and began to climb down the steel latticework. Typically the contractors accessed the structure with a ladder, but for one reason or another, the lineman chose to climb down using the corner latticework of the structure. At that point, the lineman contacted the energized arrestor with his forearm. His co-workers responded immediately and began CPR, and emergency personnel were summoned to the scene. Unfortunately, the lineman did not survive.
Despite our best efforts to protect workers in the field, incidents like these still occur and, as a result, you may find yourself leading an incident investigation. One of the primary goals of any investigation is to find out exactly what happened so that future occurrences can be prevented. With that in mind, I put together the following 10 tips designed to help you obtain quality information about each incident you investigate, put your interview subjects at ease, and determine an accurate account of what occurred before, during and immediately after each incident.