12.D Energy Isolating Devices and Procedures.
12.D.01 Energy Isolating Devices.
- Energy isolating devices are mechanical devices that, when utilized or activated, physically prevent the unplanned transmission or release of energy and include, but are not limited to the following:
- (1) A manually operated electrical circuit breaker;
- (2) A disconnect switch;
- (3) A valve, bolted blank flange and bolted slip blinds;
- (4) A block (e.g., a safety block or cribbing).
- Push-buttons, selector switches, safety interlocks, programmable logic controllers, software programming, and other control circuit type devices must not be used as energy isolating devices.
12.D.02 Locks or other positive means control must always be used when the energy isolation involves equipment that is accessible by the public.
12.D.03 All equipment must be covered by the HEC procedures and all energy sources must be controlled before performing servicing, maintenance, testing, installation or removal on equipment in which the unexpected energizing, startup, or release of stored energy could occur and cause any of the following: Personal injury, property damage, loss of content, loss of protection, loss of capacity, or harm to the environment.
Knowledge Check Choose the best answer for the question.
12-4. Which of the following may be used as an energy isolating device?
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