IEEE 422-1986 pdf free.IEEE Guide for the Design andInstallation of Cable Systems in Power Generating Stations.
IEEE 422 provides guidance for cable per-formance and should be considered in specifyingcable for installation in generating stations. Noone cable characteristic should be emphasizedto the serious detriment of others.A balance ofcable characteristics as well as good installation,design, and construction practices are necessaryto provide a sound cable system.
design life of a power generating station. Thetime during which satisfactory station perform-ance can be expected for a specific set of oper-ating conditions.service life of cable.The time during whichsatisfactory cable performance can be expectedfor a specific set of service conditions.
(1)Cables may be directly buried, installed induct banks and trenches below grade，or installed in cable trays, ‘ conduits，and wirewaysabove ground.Cable should be suitable for op-eration in wet and dry locations.
(2) Cable operating temperatures in generat-ing stations are normally based on 40 ‘Cambientair or 20 C ambient earth.Special considerationshould be given to cable installed in areas whereambient temperatures exceed these values.(3) Cables should be suitable for all environ-mental conditions that occur in the areas wherethey are installed.
Service Life. The service life of the ca-ble should be at least equal to the design life ofthe power generating station.
Thermal Stability.The cable shouldmaintain such insulating properties as requiredby operating conditions when subjected to max-imum ambient temperature and its own gen-erated heat during the design life.Moisture Resistance. The cable shouldmaintain its required insulating properties forits service life when installed in wet locations,especially underground.Chemical Resistance.The cable shouldmaintain its required insulating propertieswhen exposed to chemical environments.Flame Propagation Resistance. Ca-bles installed in open or enclosed cable trays,wireways,or in other raceway systems whereflame propagation is of concern should pass theapplicable flame test requirement of ANSI/1EE Std 383-1974 [3].
Ambient Temperature.This factor isan important design parameter because it helpsdetermine the continuous current-carrying ca-pability (ampacity) of a cable of a given size ina particular type of installation. In areas wheretemperatures exceed stated ambient, cables mayrequire ampacity derating and special types ofinsulation and jacket material.IEEE 422 pdf download.