Coordinate with Project Manager who will review with EH&S and Office of Radiation Safety for applicability to specific Laser Laboratory Projects.

1. A lighted laser entryway warming sign shall be located on the wall directly outside the main laboratory entrance at a centerline height of 5¹ 0². The sign shall be a Rockwell Laser Industries ³Illuminator² 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 egress



2. The sign shall be connected to the laser remote interlock connector so that the sign is lighted whenever the laser power supply is activated.



3. 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 Œmushroom¹ 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).



4. The design of the circuit incorporating the shutdown switch cannot permit automatic restart with restoration of power following a remote shutdown.



5. 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.



6. 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.

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