Chapter 4

Equipment for General Use

Article 490

Equipment Over 1000 Volts, Nominal Part I. General Scope. This article covers the general requirements for equipment operating at more than 1000 volts, nominal.Informational Note No. 1: See NFPA 70E -2015, Standard for Elec‐ trical Safety in the Workplace, for electrical safety requirements for employee workplaces.Informational Note No. 2: For further information on hazard signs and labels, see ANSI Z535.4-2011, Product… read more »

Article 480

Storage Batteries Scope. This article applies to all stationary installations of storage batteries.Informational Note: The following standards are frequently referenced for the installation of stationary batteries: IEEE 484, Recommended Practice for Installation Design and Installation of Vented Lead-Acid Batteries for Stationary Appli‐ cations IEEE 485, Recommended Practice for Sizing Vented Lead-Acid Storage Batteries for Stationary Applications IEEE 1145, Recommended Practice… read more »

Article 470

Resistors and Reactors Part I. 1000 Volts, Nominal, and Under Scope. This article covers the installation of separate resistors and reactors on electrical circuits.Exception: Resistors and reactors that are component parts of other apparatus.This article also covers the installation of resistors and reac‐ tors in hazardous (classified) locations as modified by Arti‐ cles 501 through 504…. read more »

Article 460

Capacitors Scope. This article covers the installation of capacitors on electrical circuits.Surge capacitors or capacitors included as a component part of other apparatus and conforming with the requirements of such apparatus are excluded from these requirements.This article also covers the installation of capacitors in hazardous (classified) locations as modified by Articles 501 through 503. Enclosing and… read more »

Article 455

Phase Converters Part I. General Scope. This article covers the installation and use of phase converters. Definitions.Manufactured Phase. The manufactured or derived phase originates at the phase converter and is not solidly connected to either of the single-phase input conductors.Phase Converter. An electrical device that converts single- phase power to 3-phase electric power.Informational Note: Phase converters have characteristics… read more »

Article 450

Transformers and Transformer Vaults (Including Secondary Ties) Part I. General Provisions Scope. This article covers the installation of all trans‐ formers.Exception No. 1: Current transformers.Exception No. 2: Dry-type transformers that constitute a component part of other apparatus and comply with the requirements for such apparatus.Exception No. 3: Transformers that are an integral part of an X-ray,… read more »

Article 445

Generators 445.1 Scope. This article contains installation and other requirements for generators. Location. Generators shall be of a type suitable for the locations in which they are installed. They shall also meet the requirements for motors in 430.14.Informational Note: See NFPA 37, Standard for the Installation andUse of Stationary Combustion Engines and Gas Turbines, for informa‐ tion on… read more »

Article 440

Air-Conditioning and Refrigerating Equipment Table 440.3(D) Other Articles Equipment/Occupancy Article Section Capacitors 460.9 Part I. General Scope. The provisions of this article apply to electric motor-driven air-conditioning and refrigerating equipment and to the branch circuits and controllers for such equipment. It provides for the special considerations necessary for circuits supplying hermetic refrigerant motor-compressors and for any… read more »

Article 430

Motors, Motor Circuits, and Controllers Part I. General Scope. This article covers motors, motor branch-circuit and feeder conductors and their protection, motor overload protection, motor control circuits, motor controllers, and motor control centers.Informational Note No. 1: Installation requirements for motor control centers are covered in 110.26(E). Air-conditioning and refrigerating equipment are covered in Article 440.Informational Note… read more »

Article 427

Fixed Electric Heating Equipment for Pipelines and Vessels Part I. General Scope. The requirements of this article shall apply to electrically energized heating systems and the installation of these systems used with pipelines or vessels or both.Informational Note: For further information, see ANSI/IEEE 515-2011, Standard for the Testing, Design, Installation and Mainte‐ nance of Electrical Resistance Trace Heating for… read more »