Download National electrical code handbook by Mark W Earley; Jeffrey S Sargent; Christopher D Coache; PDF
By Mark W Earley; Jeffrey S Sargent; Christopher D Coache; Richard J Roux
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4 Voltages. Throughout this Code, the voltage considered shall be that at which the circuit operates. The voltage rating of electrical equipment shall not be less than the nominal voltage of a circuit to which it is connected. 5 Conductors. Conductors normally used to carry current shall be of copper unless otherwise provided in this Code. Where the conductor material is not specified, the material and the sizes given in this Code shall apply to copper conductors. Where other materials are used, the size shall be changed accordingly.
A vented fuse unit in which the expulsion effect of gases produced by the arc and lining of the fuseholder, either alone or aided by a spring, extinguishes the arc. Nonvented Power Fuse. A fuse without intentional provision for the escape of arc gases, liquids, or solid particles to the atmosphere during circuit interruption. Power Fuse Unit. A vented, nonvented, or controlled vented fuse unit in which the arc is extinguished by being drawn through solid material, granular material, or liquid, either alone or aided by a spring.
B) Extra Working Space. 26(A)(1), a single entrance shall be permitted. 26(A)(1) for equipment operating at that voltage and in that condition. NATIONAL ELECTRICAL CODE 2011 Edition ARTICLE 110 — REQUIREMENTS FOR ELECTRICAL INSTALLATIONS (3) Personnel Doors. 6 m (25 ft) from the nearest edge of the working space, the door(s) shall open in the direction of egress and be equipped with panic bars, pressure plates, or other devices that are normally latched but open under simple pressure. (D) Illumination.