Laser Safety
Control Measures
Engineering Controls
Electrical Hazards
To quote the OSHA Technical Manual, Section III, Chapter 3: “This (NHZ), is an important factor since,
as the scope of laser uses has expanded, controlling lasers by total enclosure in a protective housing
or interlocked room is limiting and in many instances an expensive overreaction to the real hazards.”
Carefully designed guarding can eliminate any real light hazards associated with laser radiation
during equipment operation. This guarding can often be of very simple design. For example, the
infrared emissions from a CO2 laser can be blocked by clear polycarbonate (lexan) sheet. Often a
simple tunnel through which the product passes while being marked provides reliable, adequate
protection, preventing unsafe exposure from the direct beam or any diffuse reflections.
Certain control measures need to be in place wherever there are lasers in use. The extent of the
control measures is a function of the type of equipment installed, the nature of any shielding, and any
maintenance procedures that may be undertaken. These control measures include:
Engineering controls include proper shield interlock designs (when required), and safe system
operation controls, as in situations where the laser will be integrated into another control system.
The use of lasers or laser systems can present an electric shock hazard. This may occur from contact
with exposed utility power utilization, device control, and power supply conductors operating at
potentials of 50 volts or more. These exposures can occur during laser set-up or installation,
maintenance and service, where equipment protective covers are often removed to allow access to
active components as required for those activities. The effect can range from a minor tingle to
serious personal injury or death. Protection against accidental contact with energized conductors by
means of a barrier system is the primary methodology to prevent electrical shock.
Additional electrical safety requirements are imposed upon laser devices, systems and those who
work with them by the federal Occupational Safety and Health Administration (OSHA), the National
Electric Code and related state and local regulations. Individuals who repair or maintain lasers may
require specialized electric safety-related work practices training.
L A S E R S F O R M A R K I N G
Zetalase
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General Manual SE 1
