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          This project is intended to continue the work of the original project, P1405, with the correct document designation from C37. The original purpose is as follows: There are presently no U.S. testing methods for evaluating metal-enclosed switchgear under the effects of internal arcing. There are, however, specific references to this phenomenon in the national electric code and in OSHA safety documents. The current testing methods come from IEC 298 appendix AA, EEMAC G14-1, and SAA 1136.1 appendix D. These document are similar but there is no effort to unify the procedure or evaluation results. Therefore, there is inconsistency in the testing methods used in the U.S. This guide would consolidate the desirable aspects of all existing documents and provide an evaluation and rating structure that is compatible with U.S. standards. This revision to PC37.20.7 is to add the term &quot;Medium-Voltage&quot; to the title and throughout the document as the more correct term for describing the equipment concerned.
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