IEEE 422:2012 pdf download.IEEE Guide for the Design of Cable Raceway Systems for Electric Generating Facilities.
This document provides guidance for the design and installation of cable raceway systems for all types of electric generating facilities.
1.2 Purpose
The guide provides recommendations, methods, and best engineering practices for the design of cable raceway systems including selection of equipment, materials, and the configuration of raceway.
2. Normative references
The following referenced documents arc indispensable for the application of this document (i.e., they must be understood and used, so each referenced document is cited in text and its relationship to this document is explained). For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments or corrigenda) applies.
3. Definitions and acronyms
For the purposes of this document, the following terms and definitions apply. The IEEE Standards
Dictionary Online should be consulted for terms not defined in this clause.4
3.1 Definitions
cable shielding: A magnetic or nonmagnetic, conductive material applied over the insulated conductor or conductors to confine the electric field of the cable to the insulated conductor or conductors or to protect the insulated conductors from external electromagnetic or electrostatic interference.
cocoon (cable system enclosure): A cable wrap or enclosure used to protect cables from fire hazards and used to permit cable separation distances less than that normally required and which is typically made of a tire resistant material.
conductor (strand) shield: The conductor shield consists of a layer of semi-conductive polymer or a material with a high dielectric constant that is extruded over the conductor. The conductor shield reduces the dielectric stress at the inside surface of the insulation and prevents partial discharges by tilling in the voids and irregularities of the conductor surface and by providing a smooth, equi-potential surface at the inside surface of’ the insulation.
design life (of a cable): The time encompassing the service life of a cable and the anticipated margin beyond during which a cable is expected to operate and perform its intended function.
design life (of a power generating station): The time during which satisfactory station pcrfbrmance can be expected for a specific set of design operating conditions.
drop-out fitting: An attachment to a cable tray that maintains the proper cable minimum bend radius at the point that the cable exits from a tray. These fittings are available in configurations that can he attached to the bottom, side, or end of a tray.
insulation shield: The insulation shield is a layer of semi-conductive polymer or a material with a high dielectric constant that is applied to the outer surface of the insulation in order to establish an cquipotential surface on the outside of the insulation. This ensures that there are no areas of concentrated electric field due to sources outside of the cable, and minimizes the dielectric stress within the cable insulation.
minimum pulling bend radius: The minimum allowable value of the radius of an arc that an insulated conductor, insulated wire, or insulated cable can be bent under tension while the cable is being installed.IEEE 422 pdf download.