Powered by GoogleTranslate

Occupational Safety and Health Administration OSHA

Accident Report Detail

Accident: 201126158 - Employee Burned In Arc Flash Between Battery Banks

Accident: 201126158 -- Report ID: 0950613 -- Event Date: 10/28/2006
InspectionOpen DateSICEstablishment Name
31009142601/19/20071731Cupertino Electric, Inc
On October 28, 2006, Employee #1, a supervisor and project manager for Cupertino Electric, was part of a crew performing a scheduled wire pulling operation to prepare for a full factory startup testing phase procedure. In the "battery room" of the facility, a factory splice was missing between two 2-volt batteries in a 500-volt bank of batteries. Employee #1 attempted to install a jumper (a piece of cable with lugs on each end) between the two batteries. When the jumper made contact with the battery, the circuit was completed, resulting in an arc flash and blast. Employee #1 suffered second- and third-degree burns to his hands and arms and first- and second-degree burns to his chest, upper abdomen, neck, and face. Subsequent investigation determined that (1) the cables from battery strings 3A and 3B were not landed properly on the line side of the breakers; (2) battery string 3B was connected so that the polarity was the opposite of the field installation drawing; (3) because of the above two issues, there was a potential direct current voltage between the two points being connected; (4) a missing factory splice plate during the battery installation caused a gap; (5) no set of written instructions--referred to as a method of procedure--was created, written, or provided to the personnel working on the energized equipment and parts necessary for the factory startup test, a violation of T8CCR 2320.2(a)(2); and (6) Employee #1 was working alone in the battery distribution room. Since he was a supervisor, he was considered under Title #8 California Code of Regulations as the "authorized" person to work on energized systems. Referencing items #1, #2, #3, and #4, this substantiated a violation of Section 3328(f). Employee #1 attempted to modify the improper installation of the battery system using a jumper that was not a factory-authorized part. He and supervisory personnel later stated that he had not performed a potential test of the electrical current on the equipment and had not treated the system as energized. In addition, Employee #1 did not wear suitable personal protective equipment for working on energized equipment. A test on the energized equipment would have warned him of the potential current; approved insulated gloves and a flame-retardant top, would have protected him from an arc flash.
Keywords: battery, burn, elec protect equip, electric arc, work rules, construction, electrical work, elec circ part--misc, hand
End Use Proj Type Proj Cost Stories NonBldgHt Fatality
Manufacturing plant New project or new addition $1,000,000 to $5,000,000 3
Employee # Inspection Age Sex Degree Nature Occupation Construction
1 310091426 Hospitalized injury Burn/Scald(Heat) Supervisors; electricians & power transm. install. FallDist:
FallHt:
Cause: Installing equipment (HVAC and other)
FatCause: Electrocution by equipment contacting wire

Thank You for Visiting Our Website

You are exiting the Department of Labor's Web server.

The Department of Labor does not endorse, takes no responsibility for, and exercises no control over the linked organization or its views, or contents, nor does it vouch for the accuracy or accessibility of the information contained on the destination server. The Department of Labor also cannot authorize the use of copyrighted materials contained in linked Web sites. Users must request such authorization from the sponsor of the linked Web site. Thank you for visiting our site. Please click the button below to continue.

Close