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

(b) Conductor Insulation. Storage-battery leads shall be rubber-covered or thermoplastic-covered. 640-10. Circuit Overcurrent Protection. Overcurrent protection shall be provided as follows: (a) Heater or Filament (Cathode). Circuits to the heater or filament (cathode) of an electronic tube shall have overcurrent protection not exceeding 15 amperes where supplied by lighting branch circuits or by storage batteries exceeding 20 ampere-hour capacity. (b) Plate (Anode-Positive). Circuits to the plate (anode-positive) and to the screen grid of an electronic tube shall have overcurrent protection not exceeding 1.0 ampere. (c) Control Grid. Circuits to the control grid of an electronic tube shall have overcurrent protection not exceeding 1.0 ampere where supplied by lighting branch circuits or by storage batteries exceeding 20 ampere-hour capacity. (d) Location. Overcurrent devices shall be located as near as practicable to the source of power supply.