NFPA 70E requires that those performing the lockout/tagout (LOTO) review documentation (including up-to-date drawings and diagrams) to ensure that no electrical circuit interlock operation can result ...
Electrical ladder drawings are still one of the common and reliable tools used to troubleshoot equipment when it fails. As with any good troubleshooting tool, one must be familiar with its basic ...
Last month’s column introduced the concept of an interlock. An interlock is a dependency between two processes. Process 2 cannot operate unless Process 1 is in a certain state. For example, if a ...
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