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The NESC contains the procedure and time schedule for revising the NESC, which are described in the back of the code book. The NESC has an interpretation committee that issues formal interpretations. The process for obtaining a formal interpretation is outlined in the front of the code book. The NESC is currently published on a 5-year cycle.
The National Electrical Code (NEC), or NFPA 70, is a regionally adoptable standard for the safe installation of electrical wiring and equipment in the United States. It is part of the National Fire Code series published by the National Fire Protection Association (NFPA), a private trade association . [ 1 ]
61 Clearances from buildings of lines of voltage exceeding 650 V 62 Conductors at different voltages on same supports 63 Erection or alteration of buildings, structures, flood banks and elevation of roads 64 Transporting and storing of material near overhead lines 65 General clearances 66 Routes proximity to aerodromes
One drawback of AIS is the visual impact of a larger substation with overhead power lines entering and exiting, which may be unacceptable in scenic or urban areas. [38] AIS requires additional bracing in a seismically active area, and emits more electromagnetic fields and noise than alternative technologies.
IEC 61773 Overhead lines – Testing of foundations for structures; IEC TS 61774 Overhead lines – Meteorological data for assessing climatic loads; IEC 61784 Industrial communication networks – Profiles; IEC 61786 Measurement of DC magnetic, AC magnetic and AC electric fields from 1 Hz to 100 kHz with regard to exposure of human beings
Dynamic (electrical overhead-)line rating is a great opportunity for transmission line operators (any voltage from 15 kV to 735 kV and over). It has been studied for more than 20 years inside CIGRE and IEEE working groups.
Power system protection is a branch of electrical power engineering that deals with the protection of electrical power systems from faults [citation needed] through the disconnection of faulted parts from the rest of the electrical network.
Aerial bundled cables (also aerial bundled conductors or simply ABC) are overhead power lines using several insulated phase conductors bundled tightly together, usually with a bare neutral conductor. This contrasts with the traditional practice of using uninsulated conductors separated by air gaps.