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Outdoor Deicing & Snow Melting
“Snow at Argenteuil” | Claude Monet (1875)
Today our focus turns to outdoor electric deicing and snow melting wiring systems identified as suitable for the environment and installed in accordance with the manufacturer’s instructions. They work silently to keep snow load from caving in roofs and icicles falling from gutters onto pedestrian pathways.
While the voltage and ampere requirement of the product itself is a known characteristic, the characteristic 0f the wiring pathway — voltage, ampere, grounding, short circuit, disconnect and control — is relatively more complicated and worthy of our attention. Articles 426-427 of the National Electrical Code is the relevant part of the NEC
Free Access 2023 National Electrical Code
Insight into the ideas running through technical committee deliberations is provided by a review of Panel 17 transcripts:
2023 NEC Panel 17 Public Input Report (633 pages)
2023 NEC Panel 17 Public Comment Report (190 pages)
We hold Articles 427 in the middle of our priority ranking for the 2023 NEC. We find that the more difficult issues for this technology is the determination of which trade specifies these systems — architectural, electrical, or mechanical; covered in previous posts. Instead, most of our time will be spent getting IEEE consensus products in step with it, specifically ANSI/IEEE 515 and IEEE 844/CSA 293.
Comments on the Second Draft of the 2026 NEC will be received until April 18th.
…
We collaborate with the IEEE Education & Healthcare Facility Committee which meets online 4 times per month in European and American time zones. Since a great deal of the technical basis for the NEC originates with the IEEE we will also collaborate with IEEE Standards Coordinating Committee 18 whose members are charged by the IEEE Standards Association to coordinate NFPA and IEEE consensus products.
Issue: [19-151]
Category: Electrical, Energy
Colleagues: Mike Anthony, Jim Harvey, Kane Howard, Jose Meijer
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Dahlgren Hall & “Seasoned” Coffee Mug Stories
Named after Rear Admiral John A. Dahlgren (1809-1870) an influential figure in the development of naval ordnance during the United States Civil War. It served as an armory and drill hall for midshipmen. Its open space was ideal for indoor drills and military exercises.
The hall was constructed between 1899 and 1903. Its design was overseen by Ernest Flagg, a prominent architect who designed several buildings at the Naval Academy. Today it houses the Drydock Restaurant, a gathering place for midshipmen, faculty, and visitors.
“How to Achieve the Ultimate Filthy Navy Coffee Mug”
Industrial electroheating and electromagnetic processing
The global standards for heat tracing systems are developed by IEC Technical Committee 27. The scope of work for this committee is reproduced below:
Standardization in the field of industrial equipment and installations intended for electroheating, electromagnetic processing of materials and electroheat based treatment technologies Note: The scope of interest covers industrial installations with the use of the following equipment: – equipment for direct and indirect resistance heating; – equipment for electric resistance trace heating; – equipment for induction heating; – equipment using the effect of EM forces on materials; – equipment for arc heating, including submerged arc heating; – equipment for electroslag remelting; – equipment for plasma heating; – equipment for microwave heating; – equipment for dielectric heating; – equipment for electron beam heating; – equipment for laser heating; – equipment for infrared radiation heating. The list presents typical examples of equipment and its applications and is not exhaustive.
CLICK HERE for the link to the TC 27 Strategic Business Plan
Titles in this committee’s bibliography appears to be stable. As with all IEC titles, they are relatively narrow in scope compared with the titles promulgated by most US standards developing organizations. Our interest lies primarily in the application of this technology within and around education community buildings.
While heat tracing generally goes un-noticed it is an essential part of cold weather safety. It is wise to keep pace with its evolution with innovation in materials and controls with the lead.
We maintain this committee’s work on the standing agenda of our seasonal Snow & Ice colloquia; along with US standards developed by UL, IEEE, NEMA, NFPA, ICC, ASHRAE and a few others. We also collaborate with the IEEE Education & Healthcare Facilities Committee on this topic. See our CALENDAR for the next online meeting; open to everyone.
Issue [18-332]
Category: Electrical
Colleagues: Mike Anthony, Lorne Clark, Jim Harvey
Horologiorum
“Gather Ye Rosebuds While Ye May” John Herrick | John William Waterhouse
“The Sound of Noon” on the Charlottesville Campus
University of New Hampshire
Good luck to all those helping to move their student in to UoB accommodation this weekend! It will be a busy time with lots of students moving in, but there will be lots of support on the day, so just ask!
There’s also lots to do on campus too so come along & have a wander around pic.twitter.com/xZHG3RA2z4— Uni of Birmingham (@unibirmingham) September 21, 2024
Westminster Chimes at Rockefeller Memorial Chapel
University of Michigan
'Twas the night before the start of the fall semester. ⏰ pic.twitter.com/JZkLHr8xxQ
— Alumni Association of the University of Michigan (@michiganalumni) August 28, 2023
Niner Nation is behind you, @UNC. Together, we are all one Carolina. pic.twitter.com/0wlCj72Lh6
— UNC Charlotte (@unccharlotte) August 29, 2023
Hayes Clock Tower
Ars Sonora Bell Tower
Western University Ontario
Trinity College
Mississippi State University
南洋華僑中學
Shelton State Community College Alabama
Winona State University
Oklahoma City Community College
University of Illinois
Bucknell University Pennsylvania
St. Francis Xavier College Missouri
University of Mississippi
University of North Dakota
University of Montana
Gardner-Webb University North Carolina
University of California Berkeley
Auburn University Alabama
Indiana University
Sam Houston State University Texas
Otago University New Zealand
Hillsdale College Michigan
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National Institute of Science & Technology: Time and Frequency
National Institute of Science & Technology: Current Reliability of the WWVB Time Code
Tyme
“Tyme” was used in Middle English and earlier forms of the language, and it was commonly found in historical texts, poetry, and manuscripts of that time. It was used to refer to the passage of time, an era, or a specific moment in history.
“Steam alarm clock with a polyphonic whistle” 2004 Jacek Yerka
Today at 16:00 UTC we refresh our understanding of the technical standards for the timing-systems that maintain the temporal framework for daily life in education communities. The campus clock continues as a monument of beauty and structure even though digitization of everything has rendered the central community clock redundant.
Most leading practice discovery (and innovation) is happening with the Network Time Protocols (NTP) that synchronize the time stamps of widely separated data centers. In operation since before 1985, NTP is one of the oldest Internet protocols in current use and underlies the Internet of Things build out. NTP is particularly important in maintaining accurate time stamps for safety system coordination and for time stamps on email log messages.
Use the login credentials at the upper right of our home page.
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National Institute of Standards and Technology: What is Time?
Sapienza University of Rome: Clock Synchronization
National Fire Alarm and Signaling Code
Athletics
Date & Time: Representations For Information Interchange
“A Philosopher Lecturing on the Orrery” | Joseph Wright (1766)
Most nations follow the day/month/year format (07/01/19 for January 7, 2019, for example), but the United States adheres to its own format of month/day/year (1/7/19 or 1/7/2019). The potential for misinterpreting dates across national boundaries is the logic for ISO 8601:2019 – Data Elements And Interchange Formats – Information Interchange – Representation Of Dates And Times, the ISO format for dates represents year, month, and day from the largest unit to the smallest, most specific unit of time. The ISO date format is the date format used in SQL and is the default date setting on many computers.
ISO 8601-1:2019 Date And Time – Representations For Information Interchange – Part 1: Basic Rules
CLICK ON IMAGE FOR INTERACTIVE MAP
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How the ISO Date Format Tells Today
Date and time formats used in HTML
New update alert! The 2022 update to the Trademark Assignment Dataset is now available online. Find 1.29 million trademark assignments, involving 2.28 million unique trademark properties issued by the USPTO between March 1952 and January 2023: https://t.co/njrDAbSpwB pic.twitter.com/GkAXrHoQ9T
— USPTO (@uspto) July 13, 2023
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