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277/480 Transformer Bank Diagram: A Comprehensive Guide
Author: Dr. Eleanor Vance, P.E., Senior Electrical Engineer with 20 years of experience in power system design and analysis, specializing in high-voltage distribution systems.
Publisher: Power Systems Engineering Press, a leading publisher of technical manuals and guides for electrical engineers and technicians, focusing on power distribution and transmission.
Editor: Mark Johnson, P.E., Certified Electrical Engineer with 15 years of experience in electrical system inspection and code compliance.
Summary: This guide provides a comprehensive overview of 277/480 transformer bank diagrams, covering various configurations, best practices for design and installation, common pitfalls to avoid, and essential safety considerations. It aims to equip electrical engineers and technicians with the knowledge necessary to understand, design, and troubleshoot these critical components of electrical power distribution systems.
Keywords: 277/480 transformer bank diagram, transformer bank configuration, three-phase transformer, 277/480 voltage transformation, electrical power distribution, power system design, transformer connection diagrams, delta-wye transformer, wye-delta transformer, electrical safety, troubleshooting transformer banks.
1. Understanding the 277/480 Volt System
The 277/480 volt system is a widely used three-phase four-wire system in commercial and industrial applications. It offers a balance between safety and efficiency. The 480-volt phase-to-phase voltage is used for powering larger equipment, while the 277-volt phase-to-neutral voltage is used for lighting and smaller loads. A thorough understanding of this system is crucial when interpreting a 277/480 transformer bank diagram.
2. Types of 277/480 Transformer Bank Configurations
The 277/480 transformer bank diagram will vary depending on the configuration used. Common configurations include:
Wye-Wye (Y-Y): This configuration provides a direct 277/480 volt output from a typically higher voltage primary. It's relatively simple, but requires careful grounding considerations. The 277/480 transformer bank diagram for this configuration will clearly show the grounded neutral point.
Delta-Wye (Δ-Y): This configuration is very common, often stepping down from a higher voltage delta primary to a 277/480 volt wye secondary. The 277/480 transformer bank diagram will illustrate the delta connection on the primary side and the wye connection on the secondary. This configuration provides good voltage regulation and fault current limiting.
Wye-Delta (Y-Δ): Less frequently used for 277/480, this configuration typically steps up voltage. The 277/480 transformer bank diagram would show the opposite connection compared to the Delta-Wye.
Delta-Delta (Δ-Δ): Rarely used for 277/480, this configuration is primarily used in higher voltage systems.
3. Interpreting a 277/480 Transformer Bank Diagram
A complete 277/480 transformer bank diagram should include:
Transformer ratings: KVA rating, voltage ratios (primary to secondary), connection type (Δ-Y, Y-Y, etc.).
Wiring diagrams: Showing how the transformers are connected to each other and to the power system. This is critical for understanding phase relationships and neutral grounding.
Protective devices: Fuses, circuit breakers, and other protective equipment should be clearly indicated.
Grounding: The grounding system is vital for safety and should be detailed.
Busbar connections: Diagrammatic representation of the busbar connections within the transformer bank.
Tap settings: If applicable, the tap settings for voltage regulation should be noted.
4. Best Practices for Designing and Installing 277/480 Transformer Banks
Proper sizing: The transformer bank must be sized appropriately to handle the expected load.
Correct grounding: A robust grounding system is essential for safety and to minimize voltage imbalances.
Adequate protection: Appropriate protective devices should be selected and installed to protect the transformers and the connected equipment.
Code compliance: All designs and installations must comply with relevant electrical codes (e.g., NEC).
Clear labeling: All components should be clearly labeled for easy identification and maintenance.
5. Common Pitfalls to Avoid
Incorrect wiring: Errors in wiring can lead to phase imbalances, overheating, and equipment damage.
Insufficient grounding: Inadequate grounding can create safety hazards and voltage imbalances.
Overloading: Overloading the transformers can lead to overheating and premature failure.
Incorrect protective device selection: Inappropriate protective devices can fail to protect the system from faults.
Neglecting safety precautions: Working on energized equipment without proper safety precautions is extremely dangerous.
6. Safety Considerations when Working with 277/480 Transformer Banks
Working with high-voltage equipment is inherently dangerous. Always follow established safety procedures, including:
Lockout/Tagout: Always de-energize the equipment before working on it.
Personal Protective Equipment (PPE): Use appropriate PPE, including insulated gloves, eye protection, and safety footwear.
Trained Personnel: Only qualified and trained personnel should work on high-voltage equipment.
7. Troubleshooting 277/480 Transformer Banks
Troubleshooting should involve systematic checks, including:
Visual Inspection: Check for any signs of damage or overheating.
Voltage Measurements: Verify voltage levels at various points in the system.
Current Measurements: Check for excessive currents that may indicate faults.
Testing Protective Devices: Ensure protective devices are functioning correctly.
8. Maintaining 277/480 Transformer Banks
Regular maintenance is crucial for ensuring the longevity and reliability of the transformer bank. This includes:
Regular inspections: Visual inspections for signs of damage or wear.
Oil testing: For oil-filled transformers, regular oil testing is essential.
Cleaning: Keeping the transformers clean and free of debris is important.
Conclusion
A thorough understanding of 277/480 transformer bank diagrams is vital for electrical engineers and technicians involved in the design, installation, and maintenance of commercial and industrial power systems. By adhering to best practices, understanding potential pitfalls, and prioritizing safety, one can ensure the reliable and safe operation of these critical components.
FAQs
1. What is the difference between a delta-wye and a wye-delta transformer bank? The difference lies in the primary and secondary winding connections. Delta-wye steps down voltage, while wye-delta steps up voltage. The 277/480 transformer bank diagram will reflect these differences.
2. How do I determine the proper size of a 277/480 transformer bank? This requires calculating the total load requirements (kVA) of the system. Consult with an electrical engineer for proper sizing.
3. What are the common causes of transformer bank failures? Overloading, short circuits, insulation breakdown, and inadequate maintenance are common causes.
4. What safety precautions should be taken when working on a 277/480 transformer bank? Always lockout/tagout, use appropriate PPE, and work only with qualified personnel.
5. How often should a 277/480 transformer bank be inspected? Regular inspections should be scheduled, frequency depending on load and operating conditions, but at least annually.
6. What are the key elements of a complete 277/480 transformer bank diagram? Ratings, wiring diagrams, protective devices, grounding, busbar connections, and tap settings.
7. How do I troubleshoot a 277/480 transformer bank with low voltage? Check for overloading, loose connections, tap settings, and potential problems in the primary supply.
8. What is the importance of grounding in a 277/480 transformer bank? Grounding ensures safety, minimizes voltage imbalances, and provides a path for fault currents.
9. Can I use a 277/480 transformer bank for residential applications? Generally not. 277/480 systems are designed for commercial and industrial applications. Residential applications usually use lower voltage systems.
Related Articles:
1. Understanding Three-Phase Power Systems: A foundational article explaining the principles of three-phase power, essential for comprehending 277/480 systems.
2. Transformer Connection Diagrams: A Practical Guide: A detailed explanation of various transformer connection types, including delta-wye and wye-delta configurations.
3. NEC Code Requirements for Transformer Installations: A guide to navigating the National Electrical Code requirements specifically related to transformer installations.
4. Troubleshooting Common Electrical Power Problems: A broader guide covering troubleshooting techniques applicable to transformer bank issues.
5. Power System Protection Devices: A Comprehensive Overview: Details on various protective devices used in power systems, including those applicable to 277/480 transformer banks.
6. Grounding and Bonding in Electrical Systems: A deeper dive into grounding practices crucial for the safe operation of 277/480 transformer banks.
7. Selecting the Right Transformer for Your Application: A guide on choosing the appropriate transformer size and type based on load requirements.
8. Practical Guide to Transformer Maintenance and Inspection: A comprehensive guide on maintaining transformers to ensure their longevity and reliable operation.
9. High-Voltage Safety Procedures and Regulations: A detailed explanation of safety procedures and regulations relevant to high-voltage systems, including 277/480 transformer banks.
| 277 480 transformer bank diagram: Electric Power System Basics for the Nonelectrical Professional Steven W. Blume, 2016-11-21 The second edition of Steven W. Blume’s bestseller provides a comprehensive treatment of power technology for the non-electrical engineer working in the electric power industry This book aims to give non-electrical professionals a fundamental understanding of large interconnected electrical power systems, better known as the “Power Grid”, with regard to terminology, electrical concepts, design considerations, construction practices, industry standards, control room operations for both normal and emergency conditions, maintenance, consumption, telecommunications and safety. The text begins with an overview of the terminology and basic electrical concepts commonly used in the industry then it examines the generation, transmission and distribution of power. Other topics discussed include energy management, conservation of electrical energy, consumption characteristics and regulatory aspects to help readers understand modern electric power systems. This second edition features: New sections on renewable energy, regulatory changes, new measures to improve system reliability, and smart technologies used in the power grid system Updated practical examples, photographs, drawing, and illustrations to help the reader gain a better understanding of the material “Optional supplementary reading” sections within most chapters to elaborate on certain concepts by providing additional detail or background Electric Power System Basics for the Nonelectrical Professional, Second Edition, gives business professionals in the industry and entry-level engineers a strong introduction to power technology in non-technical terms. Steve W. Blume is Founder of Applied Professional Training, Inc., APT Global, LLC, APT College, LLC and APT Corporate Training Services, LLC, USA. Steve is a registered professional engineer and certified NERC Reliability Coordinator with a Master's degree in Electrical Engineering specializing in power and a Bachelor's degree specializing in Telecommunications. He has more than 25 years’ experience teaching electric power system basics to non-electrical professionals. Steve's engineering and operations experience includes generation, transmission, distribution, and electrical safety. He is an active senior member in IEEE and has published two books in power systems through IEEE and Wiley. |
| 277 480 transformer bank diagram: Transformers and Motors George Shultz, 2012-12-02 Transformers and Motors is an in-depth technical reference which was originally written for the National Joint Apprenticeship Training Committee to train apprentice and journeymen electricians. This book provides detailed information for equipment installation and covers equipment maintenance and repair. The book also includes troubleshooting and replacement guidelines, and it contains a minimum of theory and math.In this easy-to-understand, practical sourcebook, you'll discover:* Explanations of the fundamental concepts of transformers and motors* Transformer connections and distribution systems* Installation information for transformers and motors* Preventive maintenance, troubleshooting, and repair tips and techniques* Helpful illustrations, glossary, and appendices* End-of-chapter quizzes to test your progress and understanding - In-depth source for installation, maintenance, troubleshooting, repairing and replacing transformers and motors - Reviewed by the National Joint Apprenticeship and Training Committee for the Electrical Industry - Designed to train apprentice and journeyman electricians |
| 277 480 transformer bank diagram: Information Circular , 1990 |
| 277 480 transformer bank diagram: Electric Power Distribution Engineering Turan Gonen, 2015-08-18 A quick scan of any bookstore, library, or online bookseller will produce a multitude of books covering power systems. However, few, if any, are totally devoted to power distribution engineering, and none of them are true textbooks. Filling this vacuum in the power system engineering literature, Electric Power Distribution System Engineering broke |
| 277 480 transformer bank diagram: Electric Power System Basics Steven W. Blume, 2007-10-23 This book explains the essentials of interconnected electric power systems in very basic, practical terms, giving a comprehensible overview of the terminology, electrical concepts, design considerations, construction practices, operational aspects, and industry standards for nontechnical professionals having an interest in the power industry. From generation to household wiring, this book explains it all in easy-to-understand terms. Electrical Power System Basics exposes readers to all of the important aspects of an interconnected power system without assuming a great deal of existing knowledge or experience. Some very basic formulas are presented throughout the book and several examples, photographs, drawings, and illustrations are provided to help the reader gain a fundamental understanding of the subject. |
| 277 480 transformer bank diagram: Distribution Transformer Handbook , 2001 |
| 277 480 transformer bank diagram: Commercial Electrical Wiring John E. Traister, 2000 Commercial work uses more material and the work is usually smooth, long-lasting and more profitable than residential. This updated book has the explanations, examples, and tips to help you comply with the parts of the NEC that apply to commercial wiring in load calculations, sizing of electrical services, selecting and installing overcurrent protection and more. You'll also find how to read and understand symbols, plans, drawings and schematics common in commercial electrical work. If you want to increase your work volume and profits by moving into commercial electrical work, get this book. |
| 277 480 transformer bank diagram: Alternating Current Fundamentals John R. Duff, Milton Kaufman, 1980 |
| 277 480 transformer bank diagram: Practical Electrical Wiring Herbert P. Richter, W. Creighton Schwan, 1982 |
| 277 480 transformer bank diagram: Introduction to Energy, Renewable Energy and Electrical Engineering Ewald F. Fuchs, Heidi A. Fuchs, 2020-12-15 A great resource for beginner students and professionals alike Introduction to Energy, Renewable Energy and Electrical Engineering: Essentials for Engineering Science (STEM) Professionals and Students brings together the fundamentals of Carnot’s laws of thermodynamics, Coulomb’s law, electric circuit theory, and semiconductor technology. The book is the perfect introduction to energy-related fields for undergraduates and non-electrical engineering students and professionals with knowledge of Calculus III. Its unique combination of foundational concepts and advanced applications delivered with focused examples serves to leave the reader with a practical and comprehensive overview of the subject. The book includes: A combination of analytical and software solutions in order to relate aspects of electric circuits at an accessible level A thorough description of compensation of flux weakening (CFW) applied to inverter-fed, variable-speed drives not seen anywhere else in the literature Numerous application examples of solutions using PSPICE, Mathematica, and finite difference/finite element solutions such as detailed magnetic flux distributions Manufacturing of electric energy in power systems with integrated renewable energy sources where three-phase inverter supply energy to interconnected, smart power systems Connecting the energy-related technology and application discussions with urgent issues of energy conservation and renewable energy—such as photovoltaics and ground-water heat pump resulting in a zero-emissions dwelling—Introduction to Energy, Renewable Energy, and Electrical Engineering crafts a truly modern and relevant approach to its subject matter. |
| 277 480 transformer bank diagram: Distribution , 1957 |
| 277 480 transformer bank diagram: Electric Power Distribution Engineering Chee-Wooi Ten, Ali Mehrizi-Sani, 2024-03-22 Are you fascinated by the complex web of electrical power that illuminates our modern world? Do you want to understand the intricate systems responsible for delivering electricity to our homes, businesses, and industries? Look no further than Electric Power Distribution System Engineering, Fourth Edition by renowned author Turan Gönen, revised and updated by Chee-Wooi Ten and Ali Mehrizi-Sani. This captivating book takes you on a journey through the fascinating realm of electric power distribution, offering a comprehensive yet accessible exploration of the engineering principles, technologies, and practices that underpin this vital aspect of our daily lives. Whether you're a curious non-specialist, an avid reader with a thirst for knowledge, or a librarian or bookseller seeking an invaluable resource, Gönen's masterwork will both enlighten and captivate you. An early leader in the academic market, this book provides an overview of classical planning for electric power distribution systems, which has been used for many years in designing and analyzing electric power distribution systems. The authors have taken a bold initiative to update the content, incorporating relevant aspects reflecting the advancements of today's evolving smart grid. Within its pages, readers will discover detailed discussions on the principles of power distribution, including the fundamentals of power generation, transmission, and distribution. The authors provide detailed explanations of the various components and equipment used in distribution systems, such as transformers, circuit breakers, switches, and protective devices. As part of the book, planning for the distribution network involves sizing and considering candidate geographical locations/regions in relation to the capacity of existing infrastructure, allowing for new additions to be built. For example, this includes locations either extending another feeder from distribution substations or building new distribution substations, depending on what makes more sense. Many assumptions have been made for non-existing distribution feeders to calculate ballpark figures for determining voltage profile and power losses if they were to be constructed. Readers will gain insights into how these considerations translate into net positive, net negative, or net-zero loads. All of these aspects can be gradually integrated with renewable energy sources, innovative grid technologies, and distribution automation over time. The authors involved in this book have made significant contributions to the state-of-the-art development by incorporating recent updates from the literature, thereby addressing the latest advancements. One remarkable feature of Turan Gönen's Electric Power Distribution System Engineering is its strong focus on practical applications and real-world scenarios. In addition to providing theoretical knowledge, the book also offers numerous examples that effectively bridge the gap between theory and practice. This unique approach enables readers to comprehend the intricacies of distribution system engineering and apply their newfound knowledge to solve complex problems in the field. By seamlessly blending theoretical foundations with practical insights, Gonen's book emerges as an indispensable resource for aspiring engineers, professionals, and researchers, as it offers a comprehensive understanding of electric power distribution systems and their practical implications. |
| 277 480 transformer bank diagram: Electric Light & Power , 1961 |
| 277 480 transformer bank diagram: Specifications and Drawings for 24.9/14.4 KV Line Construction , 1999 |
| 277 480 transformer bank diagram: Building Technology Benjamin Stein, 1996 The complete guide to building technology This comprehensive guide provides complete coverage of every aspect of the building technologist's profession. It details design and installation procedures, describes all relevant equipment and hardware, and illustrates the preparation of working drawings and construction details that meet project specifications, code requirements, and industry standards. The author establishes procedures for professional field inspections and equipment operations tests, provides real-world examples from both residential and nonresidential construction projects, and makes specific references to code compliance throughout the text. This new edition incorporates changes in building codes, advances in materials and design techniques, and the emergence of computer-aided design (CAD), while retaining the logical structure and helpful special features of the first edition. More than 1,100 drawings, tables, and photographs complement and illustrate discussions in the text. Topics covered include: * Heating, ventilating, and air conditioning systems- equipment and design * Plumbing systems- equipment and design * Electrical and lighting systems- equipment and design * Testing, adjusting, and balancing procedures for all building systems * Every aspect of the building technologist's profession, from the creation of working drawings through on-site supervision and systems maintenance Extensive appendices include conversion factors; duct design data; test report forms for use in field work; design forms and schedules for electrical, HVAC, and plumbing work; and more. |
| 277 480 transformer bank diagram: Electric Machines Charles A. Gross, 2006-10-20 The two major broad applications of electrical energy are information processing and energy processing. Hence, it is no wonder that electric machines have occupied a large and revered space in the field of electrical engineering. Such an important topic requires a careful approach, and Charles A. Gross' Electric Machines offers the most balanced, a |
| 277 480 transformer bank diagram: Lighting, with which is Combined Lamps , 1973 |
| 277 480 transformer bank diagram: Power Plant Engineering , 1960 |
| 277 480 transformer bank diagram: Consulting Engineer , 1957 |
| 277 480 transformer bank diagram: The National Electrical Contractor , 1945 |
| 277 480 transformer bank diagram: Factory , 1963 |
| 277 480 transformer bank diagram: Progressive Architecture , 1957 |
| 277 480 transformer bank diagram: Electricity Pricing Lawrence J. Vogt, 2017-12-19 As the advent of the Smart Grid revolutionizes how homeowners and businesses purchase and manage power, electricity pricing is becoming more complicated and intricate than ever before, while the need for more frequent rate revisions remains a primary issue in the field. A timely and accessible guide for the new industry environment, Electricity Pricing: Engineering Principles and Methodologies helps those involved in both the engineering and financial operations of electric power systems to get the money right while ensuring reliable electric service at a fair and reasonable cost. Explores both the business functions and engineering principles associated with electricity pricing Examining pricing approaches and opportunities, this book presents tools, viewpoints, and explanations that are generally not found in contemporary literature. It clarifies valuable analysis techniques, realistic examples, and unique lessons passed along from those inside the industry. This how to do it guide fosters a multidisciplinary understanding that integrates information, methodologies, and techniques from accounting, economics, engineering, finance, and marketing. Detail-oriented but still mindful of the big picture, this book examines the complex relationship between electricity, customers, and service providers in relation to pricing. Electricity Pricing also: Presents mathematical methods and techniques used to establish electricity prices, determine cost causation, and evaluate pricing structures and mechanisms Explores ways to translate and integrate cost elements into practical pricing structures Details how engineering concepts are used to apportion production, delivery, and associated costs to determine cost of service and to support all aspects of ratemaking strategy, design, analysis, and decision making This comprehensive professional reference addresses theory but remains grounded in no-nonsense practical applications. It is dually suited to introduce newcomers to the technical principles and methodologies of electricity pricing and provide veterans with a valuable consolidation of advanced tools for pricing analysis and problem solving. Watch an interview of the author at http://youtu.be/4fU8nkDVhNY |
| 277 480 transformer bank diagram: Drawings for the Boone Project Tennessee Valley Authority. Engineering and Construction Divisions, 1957 |
| 277 480 transformer bank diagram: The Architectural Forum , 1954 |
| 277 480 transformer bank diagram: Power Engineering , 1960 |
| 277 480 transformer bank diagram: Industrial Power Distribution Ralph Fehr, 2015-11-18 This new edition of Industrial Power Distribution addresses key areas of electric power distribution from an end-user perspective, which will serve industry professionals and students develop the necessary skills for the power engineering field. Expanded treatment of one-line diagrams, the per-unit system, complex power, transformer connections, and motor applications New topics in this edition include lighting systems and arc flash hazard Concept of AC Power is developed step by step from the basic definition of power Fourier analysis is described in a graphical sense End-of-chapter exercises If you are an instructor and adopted this book for your course, please email ieeeproposals@wiley.com to get access to the instructor files for this book. |
| 277 480 transformer bank diagram: Electromechanical Machinery Theory and Performance Thomas Ortmeyer, 2018 Electromechanical Machinery Theory and Performance presents a detailed explanation of electromagnetic machines, giving specific focus on transformers and AC rotating machines that can be used in the preservation and transference of energy and power. This book is developed for students at both the graduate and undergraduate level and can be used for practicing engineers as well. The book explores different machines, transformers and converters that have become an essential part in the efficient use of both energy and power. The book includes examples and numerical exercises that will enable students and practicing engineers to efficiently practice and use certain calculations. Aimed as a one semester course, this book gives a detailed analysis of modern machines and their application. -- Prové de l'editor. |
| 277 480 transformer bank diagram: The Lineman's and Cableman's Handbook Edwin Bernard Kurtz, Thomas M. Shoemaker, 1976 |
| 277 480 transformer bank diagram: Electrical World , 1965 |
| 277 480 transformer bank diagram: Electricity 3 Walter N. Alerich, Jeff Keljik, 1991 |
| 277 480 transformer bank diagram: Coal Mine Modernization , 1950 |
| 277 480 transformer bank diagram: Coal Mine Modernization American Mining Congress, 1950 |
| 277 480 transformer bank diagram: Phase III Design Analysis for the Army Package Power Reactor: Design analysis , 1957 |
| 277 480 transformer bank diagram: Power Data for Plants of the State Water Project , 1971 |
| 277 480 transformer bank diagram: Power , 1962 |
| 277 480 transformer bank diagram: Handbook of Electrical Design Details John E. Traister, 1997 This massive handbook provides a vast array of layout details for electrical systems in residential, commercial, and industrial buildings and facilities. Hundreds of ready-to-use drawings show the complete design and layout details of electrical systems for lighting, power, signal and communications systems, raceways, and related equipment. 2,500 illus. |
| 277 480 transformer bank diagram: Electrical Engineering Lincoln D. Jones, 2004-07 Step-by-step solutions to all practice problems for the electrical engineering license examination including: fundamental concepts and techniques, machines, power distribution, electronics, control systems, computing, digital systems, communication systems, biomedical instrumentation and safety, and engineering economics. |
| 277 480 transformer bank diagram: Conference Record, Industry Applications Society, IEEE-IAS Annual Meeting (1981) IEEE Industry Applications Society. Annual Meeting, IEEE Industry Applications Society, 1986 |
| 277 480 transformer bank diagram: Conference Record, IAS Annual Meeting, IEEE Industry Applications Society IEEE Industry Applications Society, 1980 |
Microsoft PowerPoint - Track B Dist Tx Connections_wotton
The main purpose of a distribution transformer is to transform the primary voltage level (usually high) to a specific secondary voltage level which is required for specific connected equipment.
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Microsoft PowerPoint - Track B Dist Tx Connections_wotton
The main purpose of a distribution transformer is to transform the primary voltage level (usually high) to a specific secondary voltage level which is required for specific connected equipment.
MT-ATX-ZZ-480D-10KVA-480Y.277-N3R - Larson Electronics
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Ferroresonance and extremely light transformer loading are the general major causes of transformer and arrester failures when energizing Closed-Delta banks. Temporarily grounding …
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This distribution transformer provides owners with significant energy savings as well as offering environmental benefits. Higher efficiency not only extends the life of the transformer, but also …
75 kVA 1PH DOE Efficiency Transformer, 277/480V Primary, …
The MT-DOE16-1P-277.480V-75KVA-120.208V-N3R 277/480 V 1 Phase Energy Efficient Isolation Transformer from Larson Electronics is powerful, reliable and designed with the …
