OSHA Accident Investigation · Summary #221585508

NSTAR ELECTRIC

BOSTON, MA— 2022-10-11T00:00:00

Event: Blood Clot, Burn, Confined Space, Defect, Defective, Defective Equipment, Electric Arc Flash, Electrical Burn, Electrical Vault, Electrical Wire, Electrical Work, Energized, Entry Permit, Explosion, Flame-Resistant Clothing (FRC), Insulator, Maintenance, PPE, PPE Hazard Assessment, Permit, Protective Clothing, Transformer, Transformer Vault
NAICS: 221122
Inspection type: Federal Agency
Activity number: #346079783
Employer profile: NSTAR ELECTRIC
Summary number: 221585508
Report ID: 0111400

Event description

Employee dies from severe burns, blood clot in arc flash

Investigation abstract

On October 11, 2022, an employee was working for an electrical power distributor was working inside an electrical vault. The employee was performing maintenance on a deenergized CM-22 Network Protector that was connected to an energized 2,000 kilovolt-ampere (kVA) transformer. Faulty insulators caused an electrical explosion and the employee was struck by an arc-flash. The employee died from severe burns and a blood clot.

Victim

#1 Fatality Age 31 M

Event type
14

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