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|Fire and Life Safety - 19 - New Laser Laboratories: Warning Signs and Emergency
Coordinate with Project Manager who will review with EH&S and Office of Radiation Safety for
applicability to specific Laser Laboratory Projects.
- A lighted laser entryway warming sign shall be located on the wall directly outside the
main laboratory entrance at a centerline height of 5╣ 0▓. The sign shall be a Rockwell Laser
Industries │Illuminator▓ LSL-ILM-RM-F (rear mounted, flashing) or equivalent using a 40 watt
110 volt bulb. The translucent sign plate normally included with the unit is a LSL-D4-03 which
is appropriate for a Class 4 laser system. Class 3b laer systems require a special order sign
plate LSL-D3b-03. The sign should be recessed into the wall to avoid disrupting corridor
- The sign shall be connected to the laser remote interlock connector so that the sign is
lighted whenever the laser power supply is activated.
- A manual emergency shutdown switch shall be mounted inside the laser facility near the
doorway where it is clearly observable to anyone making an entrance to the facility. The switch
shall be mounted on a rigid structure at eye level where it is clear of the optical table and any
laser beam pathways. The switch shall be interlocked to the laser remote interlock connector so
that it will shut down the laser power supply when pushed. The switch shall be a normally closed
single pole single throw push button type with a red îmushroom╣ cap 2.375 inches in diameter.
The switch shall be marked with a blue and black on white sign that reads:
NOTICE - IN EMERGENCY PUSH SWITCH TO SHUTDOWN LASER (see attached sign).
- The design of the circuit incorporating the shutdown switch cannot permit automatic restart
with restoration of power following a remote shutdown.
- If the laser system does not possess a laser remote interlock connector, an appropriate
circuit utilizing relays will need toe designed and installed. The circuit should emulate the
function of a laser remote interlock connector.
- In order to familiarize the Berkeley Fire Department (BFD) personnel with the design and use
of these safety devices, it will be necessary for the Office of Radiation Safety (ORS) to provide
the BFD with annual laser safety training.