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  • Design documentation: Krypton encapsulation preconceptual design
    The u n i t substation steps down the voltage to the 277/480V split bus motor control center , MCCl. .... Small loads are supplied power at 120/208V, 3 phase through stepdown transformers.
  • Distributed Energy Resources, Power Quality and Reliability - Background
    …to the customer can be as low as 120 V single phase or 120/240 V single phase (in the latter case the 240 V secondary of the service transformer has a center tap that also provides two 120- V single-phase circuits). .... Customers with larger loads typically use three-phase power, with 120/208 V or 277/480 V service1 .
  • Standard Handbook for Electrical Engineers, Sixteenth Edition > SYSTEMS OF INTERIOR DISTRIBUTION
    3-Phase 4-wire 277/480 - V serving power and fluorescent or mercury lighting with single-phase 115/230-V circuits for other utilization provided from the power system by means of local dry-type transformers. .... For very large buildings and industrial plants, distribution is often provided at higher voltage, notably 13.2, 4.1, or 2.3 kV, stepped down to utilization voltage at strategically load - centered substations.
  • Wiring
    …four-wire service may be delta-configured, with the neutral connected at the center tap of one .... Such services typically provide 240 V , three-phase, three-wire for power and 120/240 V, single-phase .... For relatively large buildings where the loads are predominantly fluorescent lighting and power (such as for air conditioning), the service is often 277/480 V, three-phase, four-wire, supplying 480 V for power and 277 V, phase-to-neutral, for the lighting…
  • Design of Municipal Wastewater Treatment Plants: WEF Manual of Practice No. 8 ASCE Manuals and Reports on Engineering Practice No. 76, Fifth Edition > ELECTRIC...
    For lighting of both outdoor and large indoor areas, a more economical solution may be a three-phase, 60-Hz, 120/208- and 277/480 - V power supply. .... to up to 300 kW [400 hp]), which make up the bulk of loads in most wastewater .... Motor-control centers that are used to power 460 V motors rated from 186 kW (250 hp…
  • Protective relaying considerations for standby generation systems
    …and assume load within the 10 seconds required by most codes for systems serving life safety loads . .... Historically, these installations were small (typically < 2 MW), at secondary voltage ( 277/480V ) and protected primarily by molded-case circuit breakers at the generator output. .... equipment into health care and business, the increasing number and size of data centers associated with internet…
  • Electromagnetic pulse (EMP) survey of the Idaho State Emergency Operating Center, Boise, Idaho
    The FNARS radio room/communications shielded enclosure room is in the basement, adjacent to the general communications center . .... Electrical power tbr the building is furnished from the commercial grid through underground lines and a transformer that provides 277/480 - V three-phase grounded wye,. .... These devices are to be installed on the load side of any three adjacent breakers (phases) to…
  • Hot Cell Facility (HCF) Safety Analysis Report
    A 277/480V , 9OkW, turbocharged Diesel engine-generator set in B6581, Room 222, is connected by an automatic transfer switch (ATS) in B6582 to the 480V feeder from Sub 2 and panel MAIN to MCC-A, both in B6582. .... D (in the MER), serving the other Hot Exhaust Fans and a 45kVA transformer to: Panel DD (in the MER), and its subpanel 7C (86580) serving non-lighting loads A 45kVA transformer (in … UPS serving Technical Control Center security panel SRT (B6581…
  • IEEE Guide for the Protection of Network Transformers
    …Roop, D. W., and Vidonic, N. G., “Arcing Fault Protection on VEPCO’s 480Y/277 V Secondary Spot Networks … New Protection Concepts for 480 Volt Spot Networks,” EEI Working Group on 277/480 Volt Secondary Fault .... [B21] Smith, D. R., and Matty, P. W., “Spot Networks Can Improve Service Reliability to Suburban Load Centers ,” Westinghouse Engineer, May 1969.
  • Encoal mild coal gasification project: Commercial plant feasibility study
    General voltage guidelines were speeed as follows: 120/240 V for utilities and the Unintenuptible Power Suqply I(JPSI, 277/480 V for plnnt and oFsite lighting. .... Data The Load Center Study indicated that the proposed power system would supply required power reliably and safely, Demand full-load amperages were balanced among the MCCS, which were designed with an 800-A horizontal bus rating and ample expansion space.