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

Powered by Safety ®Metal-Enclosed Bus IB-DU1000! CautionBefore any adjustment, servicing, parts replacement, or any other act is performedrequiring physical contact with the electrical working components or wiring of thisequipment, the power supply must be disconnected.I. Introductionand power losses. Bus conductors may be fullround edge bars, square or round tubes, channels,This manual provides general instruction and informationor tohter configurations. Standard constructionrelated to Delta/Unibus metal-enclosed bus systems.is in compliance with ANSI C37.20 which specifiesRefer to the drawings and information included withan allowable hottest-spot conductor and spliceeach order for specific instructions. All the relevanttemperature rise of 65˚C in a 40˚C ambient. Allinformation provided should be read thoroughlycontact surfaces at joints or terminations arebefore proceeding with any activity to the installation,plated. Contatct surfaces of copper conductors aremaintenance, or operation of the bus system.electrically silver-plated and aluminum conductorsare electrically tin-plated over bronze strike by theAll work must be performed and supervised byAlstan-80A process. Bolted joints in aluminumresponsible personnel who are thoroughly trained andconductors are equipped with conical washers whichknowledgable in all aspects related to the installation,ensure maintenance of contact pressure.maintenance, and operation of bus systems. Theseinstructions are intended to provide only generalC. Insulation Systeminformation related specifically to the installation ofmetal-enclosed bus systems and do not include all theConductor supports may be track-resistant glassprocedures and precautions that must be followed toreinforced polyester blocks, cycloaliphatic epoxyinsure the safety of both personnel and equipment.blocks, or wet process porcelain post insulators.Molded support blocks are ribbed to maximize bothII. Descriptioncreepage distance and mechanical strength. Coronacontrol devices are used to mount the conductorsin the support blocks. These devices also improveA. Generalshort circuit performance by functioning as shockabsorbers for the impact forces encountered duringDelta/Unibus metal-enclosed bus systems are custom high fault currents.designed for each specific application. Segregated,non-segregated, or isolated phase constructions areavailable. A complete line of terminations, horzontaland vertical elbows, horizontal and vertical tee taps,phase transpositions, expansion joints, earthquakeand misalignment joints, wall penetration assemblies,smoke and fire barriers, etc. are utilized to optimizethe design of each bus system.Insulated conductors are normally used on systemsrated 5KV and above. Conductor insulation isavailable for low voltage bus systems. The primaryconductor insulation used is epoxy bonded directlyto the conductor. Conductor splices are usuallyinsulated with molded PVC boots. Terminations maybe insulated with tape or PVC boots.B. ConductorsD. EnclosureCopper or aluminum conductors are selected basedon desired continuous and short circuit currentcapabilities, maximum operating temperatures,Aluminum, painted and/or galvanized steel, andstainless steel housings are available to meet theenvironmental requirements of the installation.