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The GIS utilizes trapped key interlocking. Trapped key interlocks are also known as Castell or Kirk key among other names. Trapped key interlocks utilize a series of keys and locks for sequential control of equipment and machinery. The system is configured to ensure that a defined sequence of events takes place to reduce hazards before personnel are exposed to them.
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Do not attempt to bypass the proper sequence of operation. |
Trapped key systems function by requiring that a key or possibly several keys be used to enter a hazardous area, or before beginning to use equipment that may cause interferences. The only way to obtain the key(s) is by first isolating the source(s) of hazardous energy. This primary key can only be removed after hazardous energy is isolated from the machine. The use of multiple keys ensures that multiple sources of hazardous energy are removed or that a specific sequence of events must happen.
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