CLOSED-LOOP AND PROGRAMMED

POWER DISTRIBUTION 780-1. Scope. The provisions of this article apply to premise power distribution systems jointly controlled by a signaling between the energy controlling equipment and utilization equipment. 780-2. General. (a) Other Articles. Except as modified by the requirements of this article, all other applicable articles of this Code shall apply. (b) Component Parts. All equipment and conductors shall be listed and identified. 780-3. Control. The control equipment and all power switching devices operated by the control equipment shall be listed and identified. The system shall operate such that: (a) Characteristic Electrical Identification Required. Outlets shall not be energized unless the utilization equipment first exhibits a characteristic electrical identification. (b) Conditions for Deenergization. Outlets shall be deenergized when any of the following conditions occur: (1) A nominal-operation acknowledgement signal is not being received from the utilization equipment connected to the outlet. (2) A ground-fault condition exists. (3) An overcurrent condition exists. (c) Additional Conditions for Deenergization When an Alternate Source of Power is Used. In addition to the requirements in Section 780-3(b), outlets shall be deenergized when any of the following conditions occur: (1) The grounded conductor is not properly grounded. (2) Any ungrounded conductor is not at nominal voltage. (d) Controller Malfunction. In the event of a controller malfunction, all associated outlet(s) shall be deenergized. 780-5. Power Limitation in Signaling Circuits. For signaling circuits not exceeding 24 volts, the current required shall not exceed one ampere where protected by an overcurrent device or an inherently limited power source. 780-6. Cables and Conductors. (a) Hybrid Cable. Listed hybrid cable consisting of power, communications, and signaling conductors shall be permitted under a common jacket. The jacket shall be applied so as to separate the power conductors from the communications and signaling conductors. An optional outer jacket shall be permitted to be applied. The individual conductors of a hybrid cable shall conform to the Code provisions applicable to their current, voltage, and insulation rating. The signaling conductors shall not be smaller than No. 24 copper.