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Designing Lighting for People and Buildings

IES Standards Open for Public Review

Standard Practice on Lighting for Educational Facilities

Recommended Practice: Lighting Retail Spaces

IES Method for Determining Correlated Color Temperature

 

Sport Lighting

“Electrical Building World’s Columbian Exposition Chicago 1892

Today we feature the catalog of the Illumination Engineering Society — one of the first names in standards-setting in illumination technology, globally* with particular interest in its leading title IES LP-1 | LIGHT + DESIGN Lighting Practice: Designing Quality Lighting for People and Buildings.

From its prospectus:

“…LIGHT + DESIGN was developed to introduce architects, lighting designers, design engineers, interior designers, and other lighting professionals to the principles of quality lighting design. These principles; related to visual performance, energy, and economics; and aesthetics; can be applied to a wide range of interior and exterior spaces to aid designers in providing high-quality lighting to their projects.

Stakeholders: Architects, interior designers, lighting practitioners, building owners/operators, engineers, the general public, luminaire manufacturers.  This standard focuses on design principles and defines key technical terms and includes technical background to aid understanding for the designer as well as the client about the quality of the lighted environment. Quality lighting enhances our ability to see and interpret the world around us, supporting our sense of well-being, and improving our capability to communicate with each other….”

The entire catalog is linked below:

IES Lighting Library

Illumination technologies run about 30 percent of the energy load in a building and require significant human resources at the workpoint — facility managers, shop foremen, front-line operations and maintenance personnel, design engineers and sustainability specialists.  The IES has one of the easier platforms for user-interest participation:

IES Standards Open for Public Review

Because the number of electrotechnology standards run in the thousands and are in continual motion* we need an estimate of user-interest in any title before we formally request a redline because the cost of obtaining one in time to make meaningful contributions will run into hundreds of US dollars; apart from the cost of obtaining a current copy.

We maintain the IES catalog on the standing agendas of our Electrical, Illumination and Energy colloquia.   Additionally, we collaborate with experts active in the IEEE Education & Healthcare Facilities Committee which meets online 4 times monthly in European and American time zones; all colloquia online and open to everyone.   Use the login credentials at the upper right of our home page to join us.

Issue: [Various}

Category: Electrical, Energy, Illumination, Facility Asset Management

Colleagues: Mike Anthony, Gary Fox, Jim Harvey, Kane Howard, Glenn Keates, Daleep Mohla, Giuseppe Parise, Georges Zissis

*  “Brownian Motion” comes to mind because of the speed and interdependencies.

“Season of Light Illumination”

 

LEARN MORE:

Energy Standard for Sites & Buildings: Lighting

University of Michigan

The American Society of Heating, Refrigerating, and Air Conditioning Engineers (ASHRAE) is an ANSI-accredited continuous-maintenance standards developer (a major contributor to what we call a regulatory product development “stream”).   Continuous maintenance means that changes to titles in its catalog can change in as little as 30-45 days.  This is meaningful to jurisdictions that require conformance to the “latest” version of ASHRAE 90.1

Among the leading titles in its catalog is ASHRAE 90.1 Energy Standard for Sites and Buildings Except Low-Rise Residential Buildings.  Standard 90.1 has been a benchmark for commercial building energy codes in the United States and a key basis for codes and standards around the world for more than 35 years.  Free access to ASHRAE 90.1 version is available at the link below:

READ ONLY Version of 2022 ASHRAE 90.1

If you cannot access it with the link above, try the link below and select 90.1 from the title list:

Current Popular ASHRAE Standards and Guidelines

Chapter 9: Lighting, begins on Page 148, and therein lie the tables that are the most widely used metrics (lighting power densities) by electrical and illumination engineers for specifying luminaires and getting them wired and controlled “per code”.   Many jurisdictions provide access to this Chapter without charge.  Respecting ASHRAE’s copyright, we will not do so here but will use them during today’s Illumination Colloquium, 16:00 UTC.

Keep in mind that recently ASHRAE expanded the scope of 90.1 to include energy usage in the spaces between buildings:

25 January 2023: Newly Released ASHRAE 90.1-2022 Includes Expanded Scope For Building Sites

At this time, there are no redlines open for public comment

Online Standards Actions & Public Review Drafts

Education industry facility managers, energy conservation workgroups, sustainability officers, electric shop foreman, electricians and front-line maintenance professionals who change lighting fixtures, maintain environmental air systems are encouraged to participate directly in the ASHRAE consensus standard development process.

Univerzita Karlova

We also maintain ASHRAE best practice titles as standing items on our Mechanical, Water, Energy and Illumination colloquia.  See our CALENDAR for the next online meeting; open to everyone.

Issue: [Various]

Category: Mechanical, Electrical, Energy Conservation, Facility Asset Management, US Department of Energy, #SmartCampus

Colleagues: Mike Anthony, Larry Spielvogel, Richard Robben

Under Construction:  ASHRAE WORKSPACE

More:

Consulting-Specifying Engineer (March 4, 2025): Why and how to adopt the IECC for energy-efficient designs

US Department of Energy Codes Program: Power and Lighting

Rightsizing Electrical Power Systems

N.B. We are knocking on ASHRAE’s door to accept proposals for reducing building interior power chain energy and material waste that we cannot persuade National Electrical Code committee to include in the 2026 revision of the National Electrical Code.

Luminaires, Lampholders, and Lamps

Best wiring safety practice for the illumination of educational settlement occupancies is scattered throughout the National Electrical Code with primary consideration for wiring fire safety:

  • Article 410 – Covers the installation of luminaires (fixtures), lampholders, and lamps, including requirements for wiring, grounding, and support.
  • Article 210 – Covers branch circuit requirements, including those for lighting circuits in dwellings and commercial buildings.
  • Article 220 – Provides guidelines for calculating lighting loads.
  • Article 225 – Addresses outside lighting installations.
  • Article 240 – Covers overcurrent protection for lighting circuits.
  • Article 250 – Deals with grounding and bonding, which is essential for lighting circuits.
  • Article 300 – Covers general wiring methods that apply to lighting circuits.

We have done a fair amount of work on this topic over the years, including writing the chapter on campus outdoor lighting for the soon-to-be-released IEEE 3001.9 Recommended Practice for the Design of Power Systems Supplying Lighting Systems in Commercial and Industrial Facilities.   

For our meeting please refer to the workspace we have set up for the 2026 Revision of the NEC:

2026 National Electrical Code Workspace

We will pick through specifics in the transcripts of Code Making Panels 10 and 18.

 

International Building Code: Chapter 12 Section 1204 Lighting

IBC Electrical (Outdoor Lighting)

2025 Committee Action Hearings – Group B #1

Proposal for Performance-Based Building Premise Wiring | Chapter 27): Monograph Page 754

Electrical building — World Columbian Exposition, Chicago, Illinois 1892

The International Code Council bibliography of electrical safety practice incorporates titles published by the National Fire Protection Association which reference electrical safety science titles published by the Institute of Electrical and Electronic Engineers.  The relevant section of the International Building Code is therefore relatively short:

2021 International Building Code: Chapter 27 Electrical

Note that Chapter 27 provides more guidance on managing the hazards created when electricity is absent*.  Since the National Electrical Code is informed by a fire safety building premise wiring culture; absence of electricity is not as great a hazard as when building wiring systems are energized.  (“So they say” — Mike Anthony, who thinks quite otherwise.)

2024/2025/2026 ICC CODE DEVELOPMENT SCHEDULE

2025 GROUP B PROPOSED CHANGES TO THE I-CODES | Complete Monograph (2630 pages)

Although we collaborate most closely with the IEEE Education & Healthcare Facilities Committee (four times monthly in Europe and the Americas) we e encourage our colleagues in education communities everywhere to participate directly in the ICC Code Development process.   CLICK HERE to set up an account.

It is enlightening — and a time saver — to unpack the transcripts of previous revisions of codes and standards to see what concepts were presented, what got discussed; what passed and what failed.  We provide links to a few previous posts that track recent action in the ICC suite relevant to electrotechnologies:

Electric Vehicle Charging

Entertainment Occupancies

K-TAG Matrix for Healthcare Facilities

International Energy Conservation Code

The ICC suite of consensus products are relevant to almost all of our work; everyday.   See our CALENDAR that reflects our Syllabus.  Today we deal with electrical safety concepts because technical committees are meeting from November to January to write the 2023 National Electrical Code.  CLICK HERE to follow the action in more detail.

* The original University of Michigan advocacy enterprise began pounding on National Electrical Code committees to install more power reliability concepts in the 2002 Edition with only modest success.  Standards Michigan has since collaborated with the IEEE Education & Healthcare Facilities Committee to drive “absence-of-power-as-a-hazard” into the National Electrical Code; the 2023 now open for public consultation.

N.B.

Assuming building interior fire safety issues can be managed, one way of getting more electric vehicle charging stations built around campus is to install requirements into the building code — thereby putting the construction cost, operation, maintenance and risk upon real-asset Developers and Owners. Code change submittals for the Group A tranche of titles will be received until January 8, 2024.

 

Healthcare Organization Management

Open consultations:

ISO_DIS 20364 Pandemic Response Standard Draft Open for Public Consultation Comments due July 1

ISO Healthcare Management Comments on Smart Hospital Standard due January 15

 Send Mike a message to coordinate comments

“Une leçon clinique à la Salpêtrière” 1887 André Brouillet

Many large research universities have significant medical research and healthcare delivery enterprises. The leadership of those enterprises discount the effect of standards like this at their peril. It is easy to visualize that this document will have as transformative effect upon the healthcare industry as the ISO 9000 series of management standards in the globalization of manufacturing.

Scope

Standardization in the field of healthcare organization management comprising, terminology, nomenclature, recommendations and requirements for healthcare-specific management practices and metrics (e.g. patient-centered staffing, quality, facility-level infection control, pandemic management, hand hygiene) that comprise the non-clinical operations in healthcare entities.

Excluded are horizontal organizational standards within the scope of:

    • quality management and quality assurance (TC 176);
    • human resource management (TC 260);
    • risk management (TC 262);
    • facility management (TC 267), and;
    • occupational health and safety management (TC 283).

Also excluded are standards relating to clinical equipment and practices, enclosing those within the scope of TC 198 Sterilization of health care products.

This committee is led by the US Technical Advisory Group Administrator —Ingenesis.   The committee is very active at the moment, with new titles drafted, reviewed and published on a near-monthly basis,

 

DPAS ballot for ISO PAS 23617- Healthcare organization management: Pandemic response  (respiratory) —Guidelines for medical support of socially vulnerable groups – Comments due 16 October

ISO-TC 304 Healthcare Organization Management- Pandemic response – Contact tracing – Comments due August 3, 2023

[Issue 14-99]

Contact:  Lee Webster (lswebste@utmb.edu, lwebster@ingenesis.com), Mike Anthony (mike@standardsmichigan.com), Jack Janveja (jjanveja@umich.edu), Richard Robben (rrobben1952@gmail.com), James Harvey (jharvey@umich.edu), Christine Fischer (chrisfis@umich.edu), Dr Veronica Muzquiz Edwards (vedwards@ingenesis.com)

Category: Health, Global

Workspace / ISO 304 Healthcare Administration

More

Journal of Healthcare Management Standards: Operational Resilience of Hospital Power Systems in the Digital Age

ISO Focus Special Issue on Healthcare

ISO/TC 48 Laboratory equipment

ISO/TC 212 Clinical laboratory testing and in vitro diagnostic test systems

ISO/TC 198 Sterilization of health care products

How do standards contribute to better healthcare?

  • The American National Standards Institute — the Global Secretariat for ISO — does not provide content management systems for its US Technical Advisory Groups.  Because of the nascent committee, inspired by the work of Lee Webster at the University of Texas Medical Branch needed a content management system, we have been managing content on a Google Site facility on a University of Michigan host since 2014.Earlier this spring, the University of Michigan began upgrading its Google Sites facility which requires us to offload existing content onto the new facility before the end of June.  That process is happening now.  Because of this it is unwise for us to open the content library for this committee publicly.  Respecting copyright, confidentiality of ISO and the US Technical Advisory Group we protect most recent content in the link below and invite anyone to click in any day at 15:00 (16:00) UTC.  Our office door is open every day at this hour and has been for the better part of ten years.

National Rules for Electrical Installations


Gallery: Supercomputers & Data Centers

454c656374726f746563686e6f6c6f6779

 

Data Center Wiring

The bookwheel, also known as a revolving bookcase, was invented by an Italian scholar and polymath named Agostino Ramelli. Ramelli was born in 1531 in Ponte Tresa, a town in present-day Italy, and he lived during the Renaissance period.

Ramelli’s invention, described in his work titled “Le diverse et artificiose machine del capitano Agostino Ramelli” (The Various and Ingenious Machines of Captain Agostino Ramelli), was published in 1588. This book showcased a collection of 195 mechanical devices.  

Ramelli’s work contributed to the growing interest in mechanical inventions during the Renaissance period. His bookwheel design remains a fascinating example of early engineering and ingenuity, highlighting the desire for knowledge and practical solutions in the pursuit of learning and scholarly endeavors.

2026 NEC Articles 645-646-647 Information Technology Equipment, et. al First Draft Report

2026 NEC Articles 645-646-647 Information Technology Equipment, et. al Second Draft Report

“Bookwheel” Early Data Center

The standard of care for wiring safety for data centers —  a continually expanding presence in education communities even before the pandemic  — is established in National Electrical Code Articles 645 (Information Technology Equipment), Article 646 (Modular Data Centers) and Article 647 (Sensitive Electronic Equipment).   You will notice that these articles cover the topic comprehensively and bear the imprint of competing Producer-Interest groups.  There are no User-Interest representatives on Code-Making Panel 12 that represent the final fiduciary in education communities even though education communities are one of the largest markets for information and communication technology systems.

The current version of NFPA 70 is linked below:

2023 National Electrical Code

Transcripts  of technical committee action during the 2026 revision (CMP-16) are linked below because they will inform our recommendations for the 2026 National Electrical Code.  Keep in mind that the Technical Correlating Committee is moving content around the Code in order to make the NEC easier to use by experts.

CMP-16 First Draft Report | Public Input with Committee Response 

CMP-16 Second Draft Report

The transcripts of technical committee action during the 2023 revision are linked below because they will inform our recommendations for the 2026 National Electrical Code.

Code‐Making Panel 12 Public Input Report

Code-Making Panel 12 Public Comment Report

National Electrical Code CMP-12

We will use these in our exploration of what we might propose for improvements in the 2026 revision.  Public comment on the First Draft of the 2026 Edition will be received until August 28th.

The issues that have been in play in these articles of the NEC are familiar to veterans of the “food fight” – occupancy classification, cable specifications, fire protection, ventilation, energy consumption, surge protection, licensing of engineers. etc.  We look for market-making excesses by opposing stakeholders that seek to limit their risk while raising the (financial) risk to education communities.

We encourage our colleagues to participate in the NFPA code development process directly.  We also encourage stakeholders in education communities — students, faculty and staff  to join us during any of the teleconferences we co-host with the IEEE Education & Healthcare Facilities Committee 4 times monthly in both European and American time zones.   See our CALENDAR for the next online meeting.

"One day ladies will take their computers for walks in the park and tell each other, "My little computer said such a funny thing this morning" - Alan Turing

 

Related standards:

NFPA 75: Standard for the Fire Protection of Information Technology Equipment

2024 International Building Code: Special Detailed Requirements Based on Occupancy and Use

2024 International Building Code: Section 304.1 Business Group B

Energy Standard for Data Centers

Consulting-Specifying Engineer (March 4, 2025): Why and how to adopt the IECC for energy-efficient designs

2024 Update to ASHRAE Position Statements

List of Titles, Scopes and Purposes of the ASHRAE Catalog

Public Review Draft Standards

The parent title of this standard is ASHRAE Standard 90.1: Energy Standard for Buildings Except Low-Rise Residential Buildings  and is continually under revision; frequently appearing in electrical engineering design guidelines, construction specifications, commissioning and O&M titles in our industry and others.

ASHRAE 90.4 defines an alternate compliance path, specific to data centers, while the compliance requirements for “non-data center” components are contained in ASHRAE 90.1 .  The 90.4 structure also streamlines the ongoing maintenance process as well ensures that Standards 90.1 and 90.4 stay in their respective lanes to avoid any overlap and redundancies relating to the technical and administrative boundaries.  Updates to ASHRAE 90.1 will still include the alternate compliance path defined in ASHRAE 90.4. Conversely the 2022 Edition of 90.4-2022 refers to ASHRAE 90.1-2022; cross-referencing one another synchronously

Links to noteworthy coverage from expert agencies on the 2022 revisions:

Addendum g modifies Sections 3 and 6 to support the regulation of process heat and process ventilation

HPC Data Center Cooling Design Considerations

ASHRAE standard 90.4 updates emphasize green energy

ASHRAE updated its standard for data centers

How to Design a Data Center Cooling System for ASHRAE 90.4

Designing a Data Center with Computer Software Modeling

This title resides on the standing agenda of our Infotech 400 colloquium; hosted several times per year and as close coupled with the annual meetings of ASHRAE International as possible.  Technical committees generally meet during these meetings make decisions about the ASHRAE catalog.  The next all committee conference will be hosted January 20-24, 2024 in Chicago.  As always we encourage education industry facility managers, energy conservation workgroups and sustainability professionals to participate directly in the ASHRAE consensus standard development process.  It is one of the better facilities out there.

Start at ASHRAE’s public commenting facility:

Online Standards Actions & Public Review Drafts

Energy Standard for *Sites* and Buildings

Update: May 30, 2023

Proposed Addendum g makes changes to definitions were modified in section 3 and mandatory language in Section 6 to support the regulation of process heat and process ventilation was moved in the section for clarity. Other changes are added based on comments from the first public review including changes to informative notes.

Consultation closes June 4th

Update: February 10, 2023

The most actively managed consensus standard for data center energy supply operating in education communities (and most others) is not published by the IEEE but rather by ASHRAE International — ASHRAE 90.4 Energy Standard for Data Centers (2019).  It is not required to be a free access title although anyone may participate in its development.   It is copyrighted and ready for purchase but, for our purpose here, we need only examine its scope and purpose.   A superceded version of 90.4 is available in the link below:

Third ISC Public Review Draft (January 2016)

Noteworthy: The heavy dependence on IEEE power chain standards as seen in the Appendix and Chapter 8.  Recent errata are linked below:

https://www.ashrae.org/file%20library/technical%20resources/standards%20and%20guidelines/standards%20errata/standards/90.4-2016errata-5-31-2018-.pdf

https://www.ashrae.org/file%20library/technical%20resources/standards%20and%20guidelines/standards%20errata/standards/90.4-2019errata-3-23-2021-.pdf

We provide the foregoing links for a deeper dive “into the weeds”.  Another addendum has been released for consultation; largely administrative:

ASHRAE 90.4 | Pages 60-61 | Consultation closes January 15, 2023.

It is likely that the technical committee charged with updating this standard are already at work preparing an updated version that will supercede the 2019 Edition.  CLICK HERE for a listing of Project Committee Interim Meetings.

We maintain many titles from the ASHRAE catalog on the standing agenda of our Mechanical, Energy 200/400, Data and Cloud teleconferences.   See our CALENDAR for the next online meeting; open to everyone.

Originally posted Summer 2020.

 

ASHRAE International has released four new addenda to its energy conservation consensus document ASHRAE 90.4-2016 Energy Standard for Data Centers.  This document establishes the minimum energy efficiency requirements of data centers for design and construction, for the creation of a plan for operation and maintenance and for utilization of on-site or off-site renewable energy resources.

It is a relatively new document more fully explained in an article published by ASHRAE in 2016 (Click here).   The addenda described briefly:

Addendum a  – clarifies existing requirements in Section 6.5 as well as introduce new provisions to encourage heat recovery within data centers.

Addendum b  – clarifies existing requirements in Sections 6 and 11 and to provide guidance for taking credit for renewable energy systems.

Addendum d  – a response to a Request for Interpretation on the 90.4 consideration of DieselRotary UPS Systems (DRUPS) and the corresponding accounting of these systems in the Electrical Loss Component (ELC). In crafting the IC, the committee also identified several marginal changes to 90.4 definitions and passages in Section 8 that would add further clarity to the issue. This addendum contains the proposed changes for that aim as well as other minor changes to correct spelling or text errors, incorporate the latest ELC values into Section 11, and to refresh information in the Normative Reference.

Addendum e adds language to Section 11 intended to clarify how compliance with Standard 90.4 can be achieved through the use of shared systems.

Comments are due September 6th.   Until this deadline you may review the changes and comment upon them by by CLICKING HERE

Universitat de Barcelona

 

Proposed Addendum g

Education facility managers, energy conservation workgroups and sustainability professionals are encouraged to participate directly in the ASHRAE standard development process.   Start at ASHRAE’s public commenting facility:

Online Standards Actions & Public Review Drafts

The ASHRAE catalog is a priority title in our practice.  This title appears on the standing agenda of our Infotech sessions.  See our CALENDAR for the next online meeting; open to everyone.

"One day ladies will take their computers for walks in the park and tell each other, "My little computer said such a funny thing this morning" - Alan Turing

Issue: [12-54]

Category: Telecommunications, Infotech, Energy

Colleagues: Mike Anthony, Robert G. Arno, Neal Dowling, Jim Harvey, Mike Hiler, Robert Schuerger, Larry Spielvogel

Workspace / ASHRAE

 

Underground Electrotechnology

Best practice literature to be covered in our 11 AM session today are listed below.  These codes and standards ensure safety, reliability, and compliance for underground electrical and telecommunications installations:

2028 National Electrical Safety Code

  • National Electrical Code (NEC), NFPA 70
    • Relevance: The NEC, published by the National Fire Protection Association, is the primary standard for safe electrical installations in the U.S. Articles 300 (Wiring Methods), 310 (Conductors for General Wiring), and 230 (Services) cover underground wiring, including burial depths, conduit requirements, and direct-burial cables like Type UF and USE-2. For example, NEC 300.5 specifies minimum cover depths (e.g., 24 inches for direct-burial cables, 18 inches for PVC conduit).
    • Key Aspects: Rules for conductor protection, grounding, GFCI requirements, and conduit types (e.g., Schedule 80 PVC). Adopted by most U.S. jurisdictions with local amendments.

ANSI/TIA-568 Series (Commercial Building Telecommunications Cabling Standards)

  • Relevance: Governs low-voltage telecommunications cabling, including underground installations. TIA-568.2-D (Balanced Twisted-Pair) and TIA-568.3-D (Optical Fiber) specify performance requirements for cables like Cat6 and fiber optics, including maximum distances (e.g., 100 meters for twisted-pair).
  • Key Aspects: Ensures signal integrity, proper separation from high-voltage lines, and compliance for plenum or direct-burial-rated cables. Voluntary unless mandated by local codes.

IEEE 835 (Standard Power Cable Ampacity Tables)

  • Relevance: Provides ampacity ratings for underground power cables, critical for sizing conductors to prevent overheating.
  • Key Aspects: Includes data for direct-burial and ducted installations, considering soil thermal resistivity and ambient conditions. Often referenced alongside NEC for high-current applications.

UL 83 (Standard for Thermoplastic-Insulated Wires and Cables)

  • Relevance: Underwriters Laboratories standard for wires like THWN-2, commonly used in underground conduits. Ensures cables meet safety and performance criteria for wet locations.
  • Key Aspects: Specifies insulation durability, temperature ratings, and suitability for direct burial or conduit use. NEC requires UL-listed cables for compliance.

OSHA 1910.305 (Wiring Methods, Components, and Equipment)

  • Relevance: U.S. Occupational Safety and Health Administration standard for workplace electrical safety, including underground installations in industrial settings.
  • Key Aspects: Specifies approved wiring methods (e.g., armored cable, conduit) and enclosure requirements for underground cable trays or boxes. Focuses on worker safety during installation and maintenance.

CSA C22.1 (Canadian Electrical Code)

  • Relevance: Canada’s equivalent to the NEC, governing underground electrical installations. Similar to NEC but tailored to Canadian conditions and regulations.
  • Key Aspects: Defines burial depths, conduit types, and grounding requirements. For example, low-voltage cables (<30V) require 6-inch burial depth, like NEC.

Notes:

  • Regional Variations: Always consult local building authorities, as codes like the NEC or AS/NZS 3000 may have amendments. For example, some U.S. states reduce burial depths for GFCI-protected circuits (NEC 300.5).
  • Low-Voltage vs. High-Voltage: Standards like TIA-568 and ISO/IEC 11801 focus on low-voltage (e.g., <50V) telecommunications, while NEC and IEC 60364 cover both power and telecom.
  • Practical Compliance: Before installation, call 811 (U.S.) or equivalent to locate underground utilities, and obtain permits/inspections as required by local codes.
  • Critical Examination: While these standards are authoritative, they can lag behind technological advancements (e.g., new cable types like GameChanger exceeding TIA-568 limits). Over-reliance on minimum requirements may limit performance for cutting-edge applications.

Underground Electrotechnology General Conditions and Standard Details

Related:

1793-2012 – IEEE Guide for Planning and Designing Transition Facilities between Overhead and Underground Transmission Lines

The effect of an underground to overhead transition point on the specification of sheath voltage limiters in underground networks

Channel Characteristics Analysis of Medium Voltage Overhead and Mixed Overhead/Underground Cable Power Network

P81/D4, Jan 2025 – IEEE Draft Guide for Measuring Earth Resistivity, Ground Impedance, and Earth Surface Potentials of a Grounding System

 

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