ARTICLE 490. EQUIPMENT OVER 1000 VOLTS, NOMINAL


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ARTICLE 490. EQUIPMENT OVER 1000 VOLTS, NOMINAL
ARTICLE 490. EQUIPMENT OVER 1000 VOLTS, NOMINAL490.1. Scope. The requirements previously given in Art. 710 for equipment rated over 1000 V nominal are now covered in Art. 490. As defined in 490.2, the term high voltage applies to any equipment rated at more than 1000 V nominal. The systems customarily utilized as premises wiring and therefore subject to the NEC are usually not over 69 kV and therefore the technically correct terminology is "medium voltage," which is the usual term used in this book.490.21. Circuit-Interrupting Devices. Medium-voltage power CBs provide …
Citation
Frederic P. Hartwell; Joseph F. McPartland; Brian J. McPartland: McGraw-Hill's National Electrical Code 2017 Handbook, 29th Edition. ARTICLE 490. EQUIPMENT OVER 1000 VOLTS, NOMINAL, Chapter (McGraw-Hill Professional, 2017), AccessEngineering Export