Resolución 2535: adopta el Código Eléctrico Nacional, versión 1993. (Sustituye el Anejo A del Reglamento 4435)

(FPN): The above is based on amplifiers whose open-circuit voltage will not exceed 100 volts when driven with a signal at any frequency from 60 to 100 hertz sufficient to produce rated output (70.7 volts) into its rated load. This also accepts the known fact that the average program material is 12 db below the amplifier rating; thus, the average rms voltage for an open-circuit 70-volt output would be only 25 volts. 640-6. Grouping of Conductors. Conductors of different systems grouped in the same raceway or other enclosure or in portable cords or cables shall comply with (a) through (c) below. 70-670 NATIONAL ELECTRICAL CODE (a) Power-Supply Conductors. Power-supply conductors shall be properly identified and shall be used solely for supplying power to the equipment to which the other conductors are connected. (b) Leads to Motor-Generator or Rotary Converter. Input leads to a motor-generator or rotary converter shall be run separately from the output leads. (c) Conductor Insulation. The conductors shall be insulated individually, or collectively in groups, by insulation at least equivalent to that on the power supply and other conductors. Exception: Where the power supply and other conductors are separated by a lead sheath or other continuous metallic covering. 640-7. Flexible Cords. Flexible cords and cables shall be of Type S, SJ, ST, SJO, or SJT or other approved type. The conductors of flexible cords, other than power-supply conductors, shall be permitted to be of a size not smaller than No. 26, provided such conductors are not in direct electrical connection with the power-supply conductors and are equipped with a current-limiting means so that the maximum power under any condition will not exceed 150 watts. 640-8. Terminals. Terminals shall be marked to show their proper connections. Terminals for conductors other than power-supply conductors shall be separated from the terminals of the power-supply conductors by a spacing at least as great as the spacing between power-supply terminals of opposite polarity. 640-9. Storage Batteries. Storage batteries shall comply with (a) and (b) below. (a) Installation. Storage batteries shall be installed in accordance with