Power Circuit : A circuit used for supplying power from the supply network to units of equipment used for productive operation and to transformers supplying control circuits
NFPA 79 Electrical Standard for Industrial Machinery, 2002 ed. http://www.nfpa.org/assets/files/AboutTheCodes/79/ 79-A2002-rop.pdf, (Electr Std for Ind Machinery - Amer) {225 NFC}