Our goal is to provide professional logo design at an affordable price. There are instances when a tree must be trimmed or removed without prior notification. In addition, a good design and installation require the proper transformer feeder and overcurrent protection device size based on NEC articles 240, 250, 450, and applicable sections of Article 310 (Figure 2). For example, the code-based demand load of a 208 Y/120 V, 3-phase, 4-wire panelboard is 42 kVA, which does do not include spare capacity for future growth. The specific requirements start in 110.26 (A) and refer to "equipment operating at 1000 volts, nominal, or less to ground andlikely to require examination, adjustment, servicing, or maintenance while energized". I guess the key is whether transformers are likely to requireexamination, adjustment, servicing, or maintenance while energized. "7>^P*#e;dEH?7"\']Ec5>\(zx94|aX7NRc6~l}(} down from each of the ends of the long sides. The most common building industry standard ratings are 3, 6, 9, 15, 30, 37.5, 45, 75, 112.5, 150, 225, 300, 500, 750, and 1,000 kVA. Our site is customized based on your location. When does Duke Energy obtain permission to trim or take down a tree? This website uses cookies to improve your experience while you navigate through the website. You take your choice; extra safety and extra cost or regular-sized cables. Note that for MV transformers, the secondary neutral is sometimes grounded through an impedance. You have already flagged this document.Thank you, for helping us keep this platform clean.The editors will have a look at it as soon as possible. xr]U)\8R.Uj;7YU`Kb%%R1C$31WKG~{j2vS}[jtG^_GDo//H$$nwyFwhiDxEMtlf\2*2$:"_]@-X.N)C5Y&`OQDd$7(m\0"z,QJ2 >>}Mz"8u!M k*)["o?\59+7>jy@:5iVwD"AS When planning the installation, you should select a location that complies with all safety codes yet does not interfere with the normal movement of personnel, equipment, and material. ; 2 Unlimited revisions. Selecting, sizing transformers for commercial buildings, By using this website, you agree to our use of cookies. When a Customer does his own wiring, he will be considered the electrical contractor for the purpose of these requirements. With Duke Energys Builder Portal, you have the tools you need to get it done, right at your fingertips. 2 0 obj We believe it speaks for itself. Transformers change voltage levels to supply electrical loads with the voltages they require. It was great service with real professionalism from start to finish. F. Transformers located next to loading docks, truck ramps, truck backing areas, shall have a minimum clearance from curb to transformer pad of eight (8) feet, to accommodate (clear) the rear overhang of a truck trailer. PADMOUNT EQUIPMENT INSTALLED AT INTERSECTIONS *[L EgptA80~@GI#Q@hxMGPhMgoQ ] $ k. ]]> [ILLUSTRATION FOR FIGURE 1 OMITTED]. 4 0 obj This should be done at some safe access point near or at the load. Duke Energy does not prune trees for light levels or pattern. So confident am I in their workmanship and design skills that I will be coming back - and I am delighted with the results. 1 A Minimum of 4 Original Drafts for your Logo. Pruning trees around power lines should only be attempted by qualified professionals. fzVAm_mRJ}GoE>Mb-LBo^8p:>db[[wRI)9:K^>P[A$K)-Jc]!AwDI3rJ7aZVv0%DYxX^{{iQ]7-n%3wvg=yr After applying proper torque, you should wait a minute or so, and then re-tighten all bolts to the specified torque. Web10-Clearances o 10.06-01 Minimum Guy Clearances 11-Metering Many of the standards in the following subsections are applicable: o 11.01 Self-Contained Metering General o 11.09 Transformer-Rated Metering, Primary, Three-Phase o 11.11 Transformer-Rated Metering, Primary, Three-Phase - UG DEP UG Distribution Standards Representative torque requirements for making connections using steel nuts/bolts are shown in Table 1, on page 42. This has been the subject of debate for years, and I know of no clear resolution. My own opinion is that a transformer does not require working clearance, but rather only requires "breathing room" (i.e., 6" from any wall). In addition, to avoid problems, a civil engineer should be consulted for guidance on the above matters. This material will provide additional general guidelines for installing and testing both dry-type and liquid-filled transformers for placement into service. Only line clearance qualified personnel should perform tree work around or adjacent to power lines and electrical equipment. However, their operating principles will remain with the same. As appropriate, you should make arrangements to adequately support the incoming/outgoing connecting cables to ensure that there is no mechanical stress imposed on transformer bushings and connections. Performance cookies are used to understand and analyze the key performance indexes of the website which helps in delivering a better user experience for the visitors. createlogodesign provided very impressive artwork for our projects and does so in a very timely, efficient manner. The revisions were done quickly and to my specifications, and often I was provided multiple versions from which to select. Such stress could cause a bushing to crack or a connection to fail. How it Works. You will not be disappointed, i promise. Exercise care during handling to prevent equipment damage and/or personnel injury. We are extremely impressed with the work done and level of professionalism demonstrated by createlogodesign team. Before energizing a 3-phase transformer, you should arrange to monitor the voltages and currents on the low-voltage side. A careful examination should be made to ensure that all electrical connections have been properly carried out and that the correct ratio exists between the low and high-voltage windings. In this electrical system design, the transformer can be used as part of a substation, primary unit substation, secondary unit substation, or network configuration. When people identify downed lines or trees touching power lines and act wisely, it minimizes the risk from trees contacting power lines. WebDuke Energy Transmission DECorp: Duke Energy Midwest . Learn about the current state of the retail & distribution industry, and developments in technology. 2043 0 obj <> endobj As stated in the Occupational Safety and Health Authority (OSHA) standards and ANSI Z133, an unqualified person should not work within 10 feet of overhead power lines with voltages below 50,000 volts. A general approach to determining transformer capacity and selecting the proper rating for the design application is to obtain the calculated design load from the respective electrical schedule and add 20% spare capacity for future load growth to be shown in the equipment schedule, unless otherwise directed by the facility based on design parameters. The loads, which are calculated as part of the building electrical system design phase, are shown in the construction documents respective equipment schedules in VA or kVA. Re-tighten all cable retaining bolts after the first 30 days of service. There should be no attempt to handle a transformer in any other position. Our new online service request capability walks you through the process, auto-populates saved information from your profile, and gives you more control over when and For new buildings, you should work with the structural engineers so that the transformer's placement is included in the building plans. Serious injuries and even fatalities have occurred when hkO0ibv*JmG[$ You should arrange for an insulation resistance test to be carried out to make certain that no windings are grounded. The right tree or shrub, planted in the right place, can give you years of beauty and value without the potential dangers of getting too close to power lines. After installation, you should check the output voltage of the transformer. down from each of the ends of the long sides. Even mounting the unit a distance that is an exact multiple of the 120 Hz wavelength from a solid reflective surface may reinforce the sound waves, causing the transformer to seem louder than it actually is. If you cannot gradually increase the load, then full load may be applied. 0 This may include personalization of content and ads, and traffic analytics. Retail & Schools Depending upon the size and load requirements of the facility, the large majority of schools (except for some very large universities) and retail facilities are served by Whatever the choice, the cable insulation rating must be adequate for the installation. Performing this action will revert the following features to their default settings: Hooray! These practices are approved by internationally recognized tree care associations and are referred to as Integrated Vegetation Management (IVM). Transformers are designed with provisions for lifting, jacking, and/or rolling. Duke Energy uses aerial application of herbicides in areas with high brush density and rough terrain and that are hard to access to control trees and other vegetation that can pose power outage threats. From the start Steffi was prompt and responsive. How to Safely Restore Power When a Breaker Trips, Code Quiz: Transformer Rating Limitations, Nonresidential Construction Spending Increases in November, Code Conversations Podcast How to Determine Which Piping Systems Need To Be Bonded to the Common Grounding Electrode Conductor, The Top 10 Most Commonly Cited Electrical Code Violations, The Most Popular Code Quizzes of the Week from 2021, The 10 Most Popular Photo Galleries of 2021, Whats Wrong Here? 3, on page 42. https://www.facebook.com/ElectricalConstructionMaintenanceMagazine, https://www.linkedin.com/company/electrical-construction-maintenance/. A separate secondary bus enclosure is required whenever the customer is installing. Therefore, the transformer size required for converting the system voltage from 480 V, 3-phase, 3-wire to 208 Y/120 V, 3-phase, 4-wire is: Transformer size in kVA = 42 kVA x 1.25 = 52.5 kVA. If the load-side voltage is high, tap connections above 100% of line voltage must be used to lower the load voltage. We also use third-party cookies that help us analyze and understand how you use this website. Other site considerations require closer analysis. When an act of God (such as lightning, ice storms, high winds, hurricanes, tornadoes) or other natural events cause trees or other vegetation to fall across power lines and damage facilities, we cut the trees and brush so poles and lines can be replaced and re-energized. A transformer is designed to produce a minimum sound level when the connections to primary and secondary terminals are made with flexible connectors, when all transit bolts and shipping braces are loosened so the unit will float on rubber isolation pads, as shown in Fig. The MIA South Terminal expansion was designed with about 50 transformers with similar intent as the stadiums but a more diverse group of loads for the 208 Y/120 V 3-phase, 4-wire system, which also included lighting loads, signage, telecommunication, security systems, and other loads part of this building project (Figure 1). No attempt to handle a transformer in any other duke energy transformer clearance requirements often I provided. Is sometimes grounded through an impedance to my specifications, and often I was provided multiple versions which! Avoid problems, a civil engineer should be done at some safe access near. Engineer should be done at some safe access point near or at the,. 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