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Harmful Substances: A substance that, because of its properties, application or presence, creates or could create a
danger, including a chemical or biological hazard, to the health and safety of a worker exposed to it.
Isolated: To have separated, disconnected, de‐energized or depressured.
Lockout: The use of a lock or locks to render machinery or equipment inoperable or to isolate an energy or product
source. The purpose of a lockout is to prevent an energy or product isolating device (such as a switch, circuit
breaker, or valve) from accidentally or inadvertently being operated while workers are performing maintenance or
service on machinery or equipment.
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