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Arc flash results in dual injuries.

Authors
Washington State Department of Labor and Industries
Source
Olympia, WA: Department of Labor and Industries, 85-2-2006, 2006 Mar; :1
NIOSHTIC No.
20044342
Abstract
A journeyman electrician with over 25 years of experience and an electrical apprentice were removing a circuit from a 480 volt, 600 amp main breaker panelboard in the electrical room of a large public building. The breaker which supplied power to the entire building was in the off position; however, the conductors into the top of the breaker were still energized. The journeyman was in the process of removing a circuit from the upper left hand side of the enclosure. The apprentice was standing on a ladder 4 to 5 feet to the left and was manually supporting the conduit that held the circuit wires. The ground wire being removed was still connected at its other terminal. Electrical tape was not used to insulate this wire or the conducting wires. Shielding material was not used to protect the exposed energized conductors entering the main breaker. Apparently, the ground wire contacted the energized terminals on the main circuit breaker. The apprentice witnessed a large flash and loud noise, followed rapidly by two more explosive noises. He then noticed that the synthetic clothing that his work partner was wearing was in flames. The apprentice patted out the flames on his partner with his hands and burned himself in the process. He then led the journeyman electrician out of the smoke filled room and notified 911. The journeyman sustained second and third degree burns covering nearly 50% of his body. He required surgery for removal of destroyed skin and restorative skin grafts. He needed physical therapy for nearly a year. He returned to work after several months and to full time after about a year. The apprentice was treated for second degree burns. Injuries such as these may be prevented by taking the following steps: 1. Establish an electrically safe work condition whenever possible. This includes the de-energizing, lockout/tagging of disconnecting devices, grounding to protect against stored or induced electrical energy and testing to ensure the absence of voltage. 2. If work must be performed on energized equipment, the work should be performed under an effective energized work policy that meets all requirements in NFPA 70E, 130.1-130.7, (2004). This standard includes an Energized Electrical Work Permit with an acceptable justification for the live work to be performed and a description of the safe work practices to be employed. 3. Electricians should wear flame resistant clothing and appropriate PPE for arc flash/blast exposure. 4. Electrical panels should be updated to ensure compliance with current codes and safety requirements.
Keywords
Accident-prevention; Accident-rates; Accidents; Accident-statistics; Epidemiology; Exposure-assessment; Injuries; Injury-prevention; Occupational-hazards; Occupational-health; Workplace-studies; Electric-properties; Electrical-burns; Electrical-equipment; Electrical-fields; Electrical-hazards; Electrical-properties; Electrical-safety; Electrical-shock; Electricity; Electrical-workers; Training; Education; Hazards; Personal-protection; Personal-protective-equipment
Contact
Safety and Health Assessment and Research for Prevention (SHARP) Program, Washington State Department of Labor and Industries, PO Box 44330, Olympia, WA 98504-4330
Publication Date
20060301
Document Type
Other
Funding Type
Cooperative Agreement
Fiscal Year
2006
NTIS Accession No.
NTIS Price
Identifying No.
Cooperative-Agreement-Number-U60-OH-008487
Source Name
Arc flash results in dual injuries
State
WA
Performing Organization
Washington State Department of Labor and Industries
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