1. MNM Fatal 2005-12 Electrical Electrical May 23, 2005 (Nevada) May 23, 2005 (Nevada) Gold Mine Gold Mine Electrician Foreman Electrician Foreman 48 years old 48 years old 15 years mining experience 15 years mining experience

2. Overview The victim was fatally injured when he contacted an energized component inside a high voltage transformer. He was checking the stress cones on the primary side of the transformer for excessive dust. The victim was fatally injured when he contacted an energized component inside a high voltage transformer. He was checking the stress cones on the primary side of the transformer for excessive dust.

4. Causal Factor Management policies, standards, and controls were inadequate. The transformer circuit was not de-energized, locked out, tagged, and tested prior to performing work inside the transformer enclosure. Management policies, standards, and controls were inadequate. The transformer circuit was not de-energized, locked out, tagged, and tested prior to performing work inside the transformer enclosure.

5. Best Practices Before YOU work on an electrical circuit: Before YOU work on an electrical circuit: Positively determine which circuit is to be worked on. Positively determine which circuit is to be worked on. Identify the disconnecting device and de-energize power from the circuit. Identify the disconnecting device and de-energize power from the circuit. Utilize proper PPE including high voltage gloves. Utilize proper PPE including high voltage gloves. Lock out and tag out the circuit with YOUR lock. Lock out and tag out the circuit with YOUR lock. Test the circuit for voltage using properly rated test equipment. Test the circuit for voltage using properly rated test equipment. Ground all phase conductors to the equipment grounding conductor with a jumper. Ground all phase conductors to the equipment grounding conductor with a jumper.