Novel Transmission Line Design for Reduced EMF

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Novel Transmission Line Design for Reduced EMF

September 5, 2024
mike@standardsmichigan.com

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Electric Field Comparison of Conventional Transmission Line With Unconventional Transmission Line

Easir Arafat, et. al

Department of Electrical and Computer Engineering

Zero Emission, Realization of Optimized Energy Systems Laboratory

The University of Texas at Dallas

Abstract:ย To accommodate the growing demand for electricity, a novel transmission line design has been proposed. This proposed structure must undergo rigorous evaluation to ensure it complies with existing safety standards. As magnetic field and electric field are crucial for the safety of systems and their surroundings, the proposed line must adhere to established limits. This paper presents a comparison of the electric field generated by a newly proposed unconventional overhead line compared to a conventional line where electric field is calculated for each sub-conductor individually. The results demonstrate that the unconventional transmission line exhibits a more favorable electric field profile compared to the conventional line.

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In large to medium-sized cities in the US, the highest voltages typically found in the power distribution and transmission systems are as follows:

  1. Transmission Lines: These are the high-voltage lines that transport electricity over long distances from power plants to substations near populated areas. The voltages for transmission lines can range from:
    • 69 kV (kilovolts)
    • 115 kV
    • 138 kV
    • 230 kV
    • 345 kV
    • 500 kV
    • Up to 765 kV in some areas
  2. Sub-transmission Lines: These lines carry electricity from the high-voltage transmission system to the distribution substations and have voltages typically ranging from:
    • 34.5 kV
    • 69 kV
    • 115 kV
  3. Distribution Lines: These lines deliver electricity from substations to consumers and generally operate at lower voltages. Common distribution voltages include:
    • 4.16 kV
    • 13.2 kV
    • 13.8 kV
    • 25 kV
    • 34.5 kV

The specific voltage levels can vary depending on the region and the utility company managing the electrical infrastructure. The highest voltages, especially those above 230 kV, are generally found in the transmission network, which is designed to efficiently move large quantities of power over long distances.

First Day of School

September 4, 2024
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Donegan Acoustics

Today we take a cross cutting review of all the literature (codes, standards, guidelines, laws)ย  that informs safe and sustainability occupancy load, means of egress, illumination, ambient air, plumbing, electric, communication and acoustics in classrooms.

1. Building Codes

  • International Building Code (IBC): Adopted by most states, it provides guidelines for the design and construction of buildings, including schools.
  • International Existing Building Code (IEBC): Provides standards for the renovation and repair of existing school buildings.
  • State and Local Building Codes: Many states and municipalities have additional or modified codes that must be followed.

2. Fire and Life Safety Codes

  • National Fire Protection Association (NFPA) Codes:
    • NFPA 101: Life Safety Code – Sets requirements for egress, fire protection, and emergency planning.
    • NFPA 13: Installation of Sprinkler Systems – Specifies standards for automatic fire sprinkler systems.
    • NFPA 72: National Fire Alarm and Signaling Code – Covers fire alarm system installation and maintenance.
    • NFPA 70: National Electrical Code (NEC) – Outlines electrical wiring standards to prevent fire hazards.

3. Accessibility Standards

  • Americans with Disabilities Act (ADA):
    • ADA Standards for Accessible Design – Ensures that school facilities are accessible to individuals with disabilities.
  • Architectural Barriers Act (ABA): Requires accessibility in buildings constructed with federal funds.

4. Environmental and Health Standards

Thermal Environmental Conditions for Human Occupancy

  • Environmental Protection Agency (EPA) Regulations:
    • EPA Lead and Asbestos Regulations: Governs the handling of lead and asbestos in school buildings.
    • EPAโ€™s Indoor Air Quality Tools for Schools: Provides guidelines to manage air quality.

5. Structural Standards

  • American Society of Civil Engineers (ASCE):
    • ASCE 7: Minimum Design Loads and Associated Criteria for Buildings and Other Structures.
  • American Concrete Institute (ACI):
    • ACI 318: Building Code Requirements for Structural Concrete.

6. Plumbing and Mechanical Codes

  • International Plumbing Code (IPC): Provides guidelines for plumbing system design and installation.
  • International Mechanical Code (IMC): Sets standards for heating, ventilation, and air conditioning (HVAC) systems.

7. Electrical Standards

  • Institute of Electrical and Electronics Engineers (IEEE) Standards: Includes various electrical safety and installation standards relevant to school facilities.

8. Educational Specifications and Guidelines

  • Council of Educational Facility Planners International (CEFPI) Guidelines: Provides best practices for school design that promote effective learning environments.
  • State-Specific Educational Specifications: Many states have their own guidelines for the design of educational facilities to meet state-specific educational needs.

9. Safety and Security Standards

  • Crime Prevention Through Environmental Design (CPTED) Guidelines: Suggests design strategies to enhance security in school environments.
  • School Safety and Security Standards (state-specific): Some states have additional requirements for school security measures.

10. Sustainable Design Standards

  • LEED (Leadership in Energy and Environmental Design) for Schools: Provides a framework for building green and energy-efficient schools.
  • Green Building Initiative (GBI) Standards: Focuses on sustainable and energy-efficient building practices.

11. Maintenance Standards

  • International Property Maintenance Code (IPMC): Provides guidelines for the maintenance of buildings, ensuring they remain safe and functional over time.

12. Other Relevant Standards

  • Federal Emergency Management Agency (FEMA) Guidelines: Provides standards for building schools in disaster-prone areas (e.g., tornadoes, earthquakes).
  • Occupational Safety and Health Administration (OSHA) Standards: Ensures workplace safety, including in schools, covering areas like chemical safety, electrical safety, and more.

Local Considerations

  • Local Zoning Laws and Ordinances: Schools must also comply with local land use regulations, which may affect building placement, size, and use.

Classroom Acoustics


 

 

Water and Sanitation

September 4, 2024
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Water is essential for sanitation and hygiene — and proper sanitation is essential for protecting water sources from contamination and ensuring access to safe drinking water.ย ย Access to safe water and sanitation is crucial for preventing the spread of waterborne diseases, which can be transmitted through contaminated water sources or poor sanitation practices. Lack of access to safe water and sanitation can lead to a range of health problems, including diarrheal diseases, cholera, typhoid, and hepatitis A.ย ย 

On the other hand, poor sanitation practices, such as open defecation, can contaminate water sources, making them unsafe for drinking, bathing, or cooking. This contamination can lead to the spread of diseases and illness, particularly in developing countries where access to clean water and sanitation facilities may be limited.

We track the catalog of the following ANSI accredited standards developers that necessarily require mastery of building premise water systems:

American Society of Heating, Refrigerating and Air-Conditioning Engineers: ASHRAE develops standards related to heating, ventilation, air conditioning, refrigeration systems — and more recently, standards that claim jurisdiction over building sites.

American Society of Mechanical Engineers: ASME develops standards related to boilers, pressure vessels, and piping systems.

American Water Works Association: AWWA is a standards development organization that publishes a wide range of standards related to water supply, treatment, distribution, and storage.

ASTM International: ASTM develops and publishes voluntary consensus standards for various industries, including water-related standards. They cover topics such as water quality, water sampling, and water treatment.

National Fire Protection Association: NFPA develops fire safety standards, and some of their standards are related to water, such as those covering fire sprinkler systems and water supplies for firefighting within and outside buildings.ย  We deal with the specific problems of sprinkler water system safety during our Prometheus colloquia.

National Sanitation Foundation International (NSF International): NSF International develops standards and conducts testing and certification for various products related to public health and safety, including standards for water treatment systems and products.

Underwriters Laboratories (UL): UL is a safety consulting and certification company that develops standards for various industries. They have standards related to water treatment systems, plumbing products, and fire protection systems.

 

United States Standards System


* The evolution of building interior water systems has undergone significant changes over time to meet the evolving needs of society. Initially, water systems were rudimentary, primarily consisting of manually operated pumps and gravity-fed distribution systems. Water was manually fetched from wells or nearby sources, and indoor plumbing was virtually nonexistent.

The Industrial Revolution brought advancements in plumbing technology. The introduction of pressurized water systems and cast-iron pipes allowed for the centralized distribution of water within buildings. Separate pipes for hot and cold water became common, enabling more convenient access to water for various purposes. Additionally, the development of flush toilets and sewage systems improved sanitation and hygiene standards.

In the mid-20th century, the advent of plastic pipes, such as PVC (polyvinyl chloride) and CPVC (chlorinated polyvinyl chloride), revolutionized plumbing systems. These pipes offered durability, flexibility, and ease of installation, allowing for faster and more cost-effective construction.

The latter part of the 20th century witnessed a growing focus on water conservation and environmental sustainability. Low-flow fixtures, such as toilets, faucets, and showerheads, were introduced to reduce water consumption without compromising functionality. Greywater recycling systems emerged, allowing the reuse of water from sinks, showers, and laundry for non-potable purposes like irrigation.

With the advancement of digital technology, smart water systems have emerged in recent years. These systems integrate sensors, meters, and automated controls to monitor and manage water usage, detect leaks, and optimize water distribution within buildings. Smart technologies provide real-time data, enabling better water management, energy efficiency, and cost savings.

The future of building interior water systems is likely to focus on further improving efficiency, sustainability, and water quality. Innovations may include enhanced water purification techniques, decentralized water treatment systems, and increased integration of smart technologies to create more intelligent and sustainable water systems.

The first mover in building interior water supply systems can be traced back to the ancient civilizations of Mesopotamia, Egypt, and the Indus Valley. However, one of the earliest known examples of sophisticated indoor plumbing systems can be attributed to the ancient Romans.

The Romans were pioneers in constructing elaborate water supply and distribution networks within their cities. They developed aqueducts to transport water from distant sources to urban centers, allowing for a centralized water supply. The water was then distributed through a network of lead or clay pipes to public fountains, baths, and private residences.

One notable example of Roman plumbing ingenuity is the city of Pompeii, which was buried by the eruption of Mount Vesuvius in 79 AD. The excavation of Pompeii revealed a well-preserved plumbing system that included indoor plumbing in some houses. These systems featured piped water, private bathrooms with flushing toilets, and even hot and cold water systems.

The Romans also invented the concept of the cloaca maxima, an ancient sewer system that collected and transported wastewater away from the city to nearby bodies of water. This early recognition of the importance of sanitation and wastewater management was a significant advancement in public health.

While the Romans were not the only ancient civilization to develop indoor plumbing systems, their engineering prowess and widespread implementation of water supply and sanitation infrastructure make them a key player in the history of building interior water systems.

Classroom Furniture

September 4, 2024
mike@standardsmichigan.com
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“The Country School” | Winslow Homer

The Business and Institutional Furniture Manufacturers Association standards catalog — largely product (rather than interoperability oriented) is linked below:ย ย 

BIFMA Standards Overview

In stabilized standards, it is more cost effective to run the changes through ANSI rather than a collaborative workspace that requires administration and software licensing cost.ย  Accordingly, redlines for changes, and calls for stakeholder participation are released in ANSI’s Standards Portal:

STANDARDS ACTION WEEKLY EDITION

Send your comments to Dave Panning.ย  (See Dave’s presentation to the University of Michigan in the video linked below.

John Peace Laptop Library Lounge | University of Texas, San Antonio

We find a great deal of interest in sustainable furniture climbing up the value chain and dwelling on material selection and manufacture.ย  We encourage end-users in the education industry — specifiers, department facility managers, interior design consultants, housekeeping staff and even occupants — to participate in BIFMAย  standards setting. ย  ย  You may obtain an electronic copies for in-process standards from David Panning, (616) 285-3963, dpanning@bifma.org ย ย You are encouraged to send comments directly to BIFMA (with copy to psa@ansi.org).ย ย David explains its emergent standard for furniture designed for use in healthcare settings in the videorecording linked below:

Issue: [15-267]

Contacts: Mike Anthony, Christine Fischer, Jack Janveja, Dave Panning

Category: Architectural, Facility Asset Management


Related:

A Guide to United States Furniture Compliance Requirements

Educational Seating

High Voltage Electric Service

September 3, 2024
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IEEE Education & Healthcare Facilities Committee

Current Issues and Recent Research

Representative Sample of Merchant Utility Interconnection Requirements for Customers

Ahead of the October Second Draft committee meeting on the 2026 revision we will examine First Draft balloting on the following:

  1. How does “high voltage” differ among electrotechnology professionals?ย  Signaling and control systems workers have a much lower criteria than a merchant utility lineman than a campus bulk distribution engineer.ย  In other words, “high voltage” is generally understood in practice and essential for worker safety.ย  Labeling counts.
  2. What is the origin of the apparent “confusion’ about high voltage in the IEEE, IEC, NFPA and TIA electrical safety catalogs?ย  Is the distinction functionally acceptable — i.e. a term of art understood well enough in practice?
  3. How can the 2026 NEC be improved for engineers, electricians and inspectors?ย  There has been some considerable re-organization of low, medium and high voltage concepts in the 2023.ย  It usually takes at least two NEC revision cycles for workable code to stabilize.ย  Since education communities purchase and distribute higher voltage power on large campuses; how can power purchasing and customer distribution system best practice be improved?

This is plenty to talk about.ย  ย Join us today at 15:00/16:00 UTC with the login credentials at the upper right of our home page.

2028 National Electrical Safety Code

2026 National Electrical Code Workspace

Time Synchronization of Medium Voltage Substations

NESC & NEC Cross-Code Correlation


National Electrical Definitions

Farm Electrical Power

September 3, 2024
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ACTION ITEMS:

Article 547: Agricultural Buildings

Public Input with Responses from CMP-7 (Start at PDF Page 187)

Public Input with Responses from CMP-2 Article 220 Part V: Farm Load Calculations (Start at PDF Page 28)

Related: National Electrical Safety Code (Higher Voltage Distribution Wiring from Merchant Utility to Off-Campus Agricultural Outbuildings)

Sunday, Animal, Farm, Agri

Many land grant colleges and universities are stewards of agricultural facilities that require reliable electrical power that is safe and sustainable for livestock and animal habitat for sporting.

FREE ACCESS: 2023 National Electrical Code

The premise wiring rules for hazardous university owned buildings have been relatively stable.ย  Electrical professionals are guided by:

  1. Farm Load Calculations of Part V of Article 220,
  2. Corrosion mitigation with appropriate specification of power chain wiring
  3. Stray voltage and the equipotential plane
  4. Interactivity with regulated utility power sources.

Public response to the First Draft of the 2026 National Electrical Code will be received until August 28, 2024.ย  We coordinate our approach to the entire NFPA electrical suite with the IEEE Education & Healthcare Facilities Committee which meets 4 times monthly.ย  We typically refer to previous transcripts of technical committee actions to inform any changes (improvements) that we propose, if any.

2026 National Electrical Code Workspace

We maintain this issue on the standing agenda of our Power and Nourriture (Food) colloquia.ย  Feel free to join us with the login credentials at the upper right of our home page.


More:

2028 National Electrical Safety Code

Stray Voltage: Sources and Solutions

University of Nebraska:ย G87-845 Electrical Systems for Agricultural Buildings (Recommended Practices)

Cornell University Agricultural Safety and Health Program

Mike Holt

Fred Hartwell

National Safety Councilย  (22 deaths by electrocution on farms per 100,000 in 2017)

National Agriculturalย  Safety Database

 

Stray Voltage: Sources and Solutions

September 3, 2024
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Michigan State University

 

Stray Voltage: Sources and Solutions

Truman C. Surbrook – Norman D. Reese – Angela M. Kehrle

 

Abstract.ย  Stray voltage is caused by voltage drop and ground faults and may have its origin on the primary electrical distribution system or on the customer’s secondary electrical system. The rms value of the neutral-to-earth voltage along a primary distribution line may be at a value of zero some distance from the substation depending on the condition of the conductor resistances, grounding resistances, and the amount of load. Neutral-to-earth resistance is not the cause of stray voltage; however, the value of this resistance to earth at a particular location will affect the level of stray voltage. A four-wire single-phase feeder system supplying farm buildings from a single metering point is effective in preventing on-farm secondary neutral voltage drop, provided the four-wire system is extended to all farm loads, and provided no high-magnitude ground faults are present. Isolation of the primary and secondary neutral systems at the distribution transformer is effective in preventing off-farm sources from entering the customer’s system. This separation may be accomplished using a number of commercially available devices.

CLICK HERE for access to the entire paper

Colloquy (September)

September 2, 2024
mike@standardsmichigan.com
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Open agenda; Not Too Organized. Whatever anyone wants to talk about.ย  We do meet once a month like this.ย  Use the login credentials at the upper right of our home page.

Fall Hours at our State Street Office: 8:30 AM – 4:00 PM

Join us for lunch 11:45 AM – 1:15 PM every Third Wednesday

University of Michigan Business School Executive Dining Room

We explain changes to our syllabus given that five conferences we attend will happen mid-September through mid-November: ANSI (Washington, DC), IEC (Edinburgh, Scotland), NFPA (Redondo Beach, California) and IEEE (Long Beach, California).ย  ย Mike will be out of the office with sporadic availability.ย  The front desk will be open.ย  Sanne Clare will take phone calls September 27 through October 4.

Retrodiction

Education & Healthcare Facility Electrotechnology Committee

 

 

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