This library provides general educational information. Articles may reflect the equipment, terminology and practices of the time they were written and may contain errors or omissions.
Electrical equipment and systems can cause serious injury. The articles do not replace equipment instructions, current applicable requirements, site procedures or the judgment of qualified personnel. Do not use them as a standalone basis for installation, operation, maintenance or safety decisions.
Links to third-party sites are provided for reference. Their content is controlled by their respective operators.
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