IB-DU1000 Metal-Enclosed Bus - Powell Industries, Inc.

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10 Powered by Safety ®Metal-Enclosed Bus IB-DU1000E. Field TestingA one minute AC high potential test can be performed at 75% of the factory test voltage indicated on the test tagshipped attached to each section of bus. This test is in accordance with ANSI C37.23. See Table 1. The test voltageis applied phase-to-phase and phase-to-ground. If an AC test set is not available, a one minute DC test may beused. All internal components of the bus must be CLEAN and DRY before performing the high potential test.Operation of the bus heaters a minimum of 72 hours before performing a high potential test is recommended.Voltage and Insulation LevelsBus RatingInsulation Level (kV)Field TestOne Minute WithstandRated MaximumkV (RMS)Power Frequency Withstand(RMS) Dry One MinuteImpulseWithstandACkV-RMSDCkV0.635 2.2 NA 1.65 2.34.76 19.0 60 14.25 20.2515.00 36.0 95 27.00 37.5015.50 50.0 110 37.50 52.5025.80 60.0 125 45.00 63.7538.00 80.0 150 60.00 84.00
Metal-Enclosed BusIB-DU1000V. Operation and MaintenanceA. OperationThe metal enclosed bus systems described in thismanual are self cooled systems which have nomoving components. A long reliable service life isassured by carefully following the simple installationand maintenance procedures outlined in this manual.The bus should never be energized with the presenceof moisture or heavy contamination on the interiorsurfaces of the bus. The bus heaters should beoperated a minimum of 72 hours as noted underMAINTENANCE before energizing a bus that has beenout of service for a period of time. The bus heatersmust remain operational any time the bus is in serviceand the possibility of condensation exists.All covers must be securely in position at all timesduring the operation of the bus. Any dented ordamaged housings must be carefully inspected andcorrective action taken before energizing the bus.The bus system is not intended to be a walkway andthis type of activity must be avoided.B. MaintenanceThe Delta/Unibus metal enclosed bus systemhas been designed to eliminate any componentsthat might require periodic routine lubrication,maintenance, or replacement. An annual inspectionof the bus is recommended. This should include acomplete visual check for damage or deteriorationand an operational test of the space heater system.CAUTION: THE BUS SYSTEM MUST BE DE-ENERGIZEDDURING THE REMOVAL OR INSTALLATION OFHEATERS. Screened or filtered breathers shouldbe inspected and cleaned at periodic intervalsdetermined by existing site conditions. Theinsulation should be inspected and cleaned asrequired. Isopropyl alcohol is a suitable solvent thatis recommended. Particular care should be takento avoid the application of any harsh solvents. Theinside surfaces of the housing should be wiped toremove any loose contamination. A vacuum cleanermay be used to facilitate the removal of looseparticles.Field experience has verified that re-torquing ofproperly installed conductor connecting hardwareis not required on a routine basis. Connections thatare suspect should be inspected and re-torqued asrequired.New gasketing is recommended when reinstallingcovers that have been removed.C. Spare PartsThe Delta/Unibus metal enclosed bus system hasbeen designed to eliminate any components thatmight require periodic routine replacement. Thereare no moving parts. Accordingly it is not necessaryfor users to maintain a stock of spare parts.The procedures described under MAINTENANCEmay result in the need for some miscellaneousmaterials such as gasketing, cover mountinghardware, insulating materials, and touch up paint.The availability of these materials can facilitate thecompletion of preventative maintenance inspections.D. Field ServiceContact either your Delta/Unibus sales representativeor the Delta/Unibus plant for further assistance.Trained field service engineers are available toprovide on-site assistance when desired.Delta/Unibus cannot be responsible for anymodifications made to any bus system without itsexpress written authorization.Powered by Safety ® 11
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IB-DU1000 Metal-Enclosed Bus - Powell Industries, Inc.

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