A technician at the Stanford Linear Accelerator Center suffered second and third degree burns while installing a circuit breaker when an electrical arc of 480 volts erupted and ignited his clothes. Two coworkers nearby were able to quickly extinguish the flames. The technician was being treated at a burn unit in a hospital. Center officials suspended operations at the accelerator for a few days to investigate the accident but did not expect it to affect research work.

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Stanford University
Technician injured at linear accelerator
-Ulysses Torassa
Thursday, October 12, 2004
A technician suffered second and third degree burns Monday after a 480 volt
electrical arc erupted during the installation of a circuit breaker at the Stanford
Linear Accelerator Center, authorities said.
The man, who was not identified, was installing the device at 11:18 a.m. next to an
electrical panel in a section of the 2 mile long accelerator located just west of
Interstate 280, said center spokesman Neil Calder.
The arc ignited his clothes and threw him backward, but two co-workers who were
nearby were able to put out the flames quickly. He was being treated in the
burn unit at Santa Clara Valley Medical Center in San Jose.
Calder said officials had suspended operations at the accelerator for a few days
while the accident is investigated but that the halt was unlikely to affect any
research work.
SFGate.com

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Article 110.16 Flash Protection
Switchboards, panelboards, industrial control
panels, and motor control centers that are in other
than dwelling occupancies and are likely to
require examination, adjustment, servicing, or
maintenance while energized shall be field marked
to warn qualified persons of potential electric arc
flash hazards. The marking shall be located so as
to be clearly visible to qualified persons before
examination, adjustment, servicing, or
maintenance of the equipment.
FPN No. 1: NFPA 70E-2000, Electrical Safety Requirements for Employee Workplaces,
provides assistance in determining severity of potential exposure, planning safe work
practices, and selecting personal protective equipment.
FPN No. 2: ANSI Z535.4-1998, Product Safety Signs and Labels, provides guidelines for
the design of safety signs and labels for application to products.

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