The latest version of the ICC/MBI Standard 1200 is the 2020 edition, specifically the ICC/MBI 1200-2020: Standard for Off-Site Construction: Planning, Design, Fabrication and Assembly. This standard, developed by the International Code Council (ICC) in collaboration with the Modular Building Institute (MBI), addresses the planning, design, fabrication, and assembly of off-site construction projects. It is part of a series of standards aimed at ensuring safety and compliance in off-site construction processes.
Branch circuits relevant to modular classroom buildings are primarily addressed in Article 120: Branch Circuits (formerly Article 210 in previous editions). This article covers requirements for branch-circuit sizing, overcurrent protection, outlets, and general installation rules for circuits up to 1000 volts AC or 1500 volts DC. Key sections include:120.19: Conductor sizing and derating.
120.20: Overcurrent protection.
120.21: Receptacle outlets and tamper-resistant requirements.
120.23: Specific rules for appliances and fixed equipment.
For outside branch circuits, see Article 267: Outside Branch Circuits and Feeders over 1000 Volts AC or 1500 Volts DC, Nominal (if applicable to higher voltages).Feeder Circuit RulesFeeder circuits are primarily addressed in Article 121: Feeders (formerly Article 215 in previous editions). This article details feeder conductor sizing, grounding, and disconnecting means for circuits supplying branch circuits or sub-feeders up to 1000 volts AC or 1500 volts DC.Key sections include:121.2: Minimum rating and sizing.
121.3: Overcurrent protection.
121.4: Feeders as branch circuits (when applicable).
Outside feeders are covered in Article 267: Outside Branch Circuits and Feeders over 1000 Volts AC or 1500 Volts DC, Nominal (for higher voltages) or cross-referenced in Article 267 for general outside installations.
For modular school buildings detached from the main building with pre-installed single or three phase wiring systems, designers must choose between a separate service drop from a merchant utility or tapping into an existing source from the nearby school building.
Compact Muon Solenoid / European Organization for Nuclear Research
Modular classroom buildings, often prefabricated and portable, require special attention in electrical power design to ensure safety, compliance, and functionality. The 2026 National Electrical Code (NEC) emphasizes proper sizing of branch circuits (Article 120) and feeders (Article 121) based on load calculations (Article 122), accounting for lighting, HVAC, and technology demands. Designers must consider temporary or relocatable installations, ensuring grounding and bonding comply with Article 250 for safety. Flexible wiring methods, like cord-and-plug connections, may be needed for portability, per Article 400. Modular units often face environmental challenges, requiring weather-resistant materials and equipment (Article 110). Surge protection (Article 285) is critical to safeguard sensitive classroom electronics. Accessibility for maintenance and inspections, per Article 110.26, is vital due to compact designs. Finally, compliance with local codes and coordination with utility connections ensure reliable power delivery for educational environments.
We have tried for several cycles to change the “Type of Occupancy” listing in NEC Table 220.12 to reflect more granular definition for School/university and Sports arena lighting load calculations. We will have another chance in the 2026 NEC. [Public input is due September 10th]
Public Input Closing Date: September 7, 2023
4 February 2021
Let’s start marking up the 2023 National Electrical Code, shall we? We will collaborate with IEEE Standards Coordinating Committee 18 — the committee that follows NFPA electrical safety consensus products and coordinates the response of IEEE electrical power professionals.
A good place to start is with the transcripts of the 2020 revision — AVAILABLE HERE for free. We look for proposals that failed for one reason or another; holding fast to our hunch that changes to the ampere load requirements that appear in the prescriptive statements to designers and inspectors of Chapter 2 could changed. The 2020 transcripts of Code-Making Panel 4 are linked below:
We have been trying for several NEC revision cycles to change the “Type of Occupancy” tabulations of Table 220.12 to reflect more granular definition in the Volt/Ampere requirement of 33 VA/m2 (3 VA/ft2) for School/university and Sports arena. Some of the problem in Table 220.12 regarding electrical loads in education facilities lies in its foundation built upon the International Building Code; the remainder of the problem lies with the education facility industry itself; described in detail in our ABOUT.
The good news is that the NFPA Fire Protection Research Foundation (FPRF) recognizes the problem and is acting on it; described in previous posts and in its project portfolio. Keep in mind that Standards Michigan, the original voice of the user-interest for education facility industry in the global standards system, has to compete with other, competitor stakeholders who make their market in this and in other consensus products accredited by the American National Standards Institute.
Public input for the 2023 National Electrical Code is due September 10th. We will collaborate with the FPRF and the IEEE Education & Healthcare Facilities Committee, and others, to get informed public input to Code-Making Panel 2 and the NEC Technical Correlating Committee. See our CALENDAR for our next Electrical & Telecommunication teleconference, open to everyone.
Issue: [19-201]
Category: Electrical
Colleagues: Mike Anthony, Scott Gibb, Jim Harvey, Kane Howard, Paul Kempf, Philip Ling, Jose Meijer
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The first elevator in the United States was installed at Harvard University in 1874. It was not a passenger elevator as we typically think of today, but rather a freight elevator used to move heavy items within a building. The installation of this elevator marked an important development in building technology and transportation within multi-story structures. It was based on the design of Elisha Otis, who is famous for inventing the safety elevator with a safety brake system that prevents the elevator from falling if the hoisting cable fails. Otis’ innovation played a pivotal role in making elevators safe and practical for everyday use, leading to their widespread adoption in buildings around the world.
Elevator design by the German engineer Konrad Kyeser (1405)
Education communities are stewards of 100’s of lifts, elevators and moving walks. At the University of Michigan, there are the better part of 1000 of them; with 19 of them in Michigan Stadium alone. The cost of building them — on the order of $50,000 to $150,000 per floor depending upon architectural styling — and the highly trained staff needed to operate, maintain and program interoperability software is another cost that requires attention. All building design and construction disciplines — architectural, mechanical and electrical have a hand in making this technology safe and sustainabile.
We start with international and nationally developed best practice literature and work our way to state level adaptations. Labor for this technology is heavily regulated.
Its a rarefied and crazy domain for the user-interest. Expertise is passionate about safety and idiosyncratic but needs to be given the life safety hazard. Today we review o pull together public consultation notices on relevant codes, standards and regulations today 11 AM/EDT.
The International Code Council bibliography of elevator safety practice incorporates titles published by American Society of Mechanical Engineers, the National Fire Protection Association and the Institute of Electrical and Electronic Engineers. The relevant section of the International Building Code is therefore relatively short and linked below.
Elevator, escalator and moving walk systems are among the most complicated systems in any urban environment, no less so than on the #WiseCampus in which many large research universities have 100 to 1000 elevators to safely and economically operate, service and continuously commission. These systems are regulated heavily at state and local levels of government and have oversight from volunteers that are passionate about their work.
These “movement systems” are absorbed into the Internet of Things transformation. Lately we have tried to keep pace with the expansion of requirements to include software integration professionals to coordinate the interoperability of elevators, lifts and escalators with building automation systems for fire safety, indoor air quality and disaster management. Much of work requires understanding of the local adaptations of national building codes.
Some university elevator O&M units use a combination of in-house, manufacturer and standing order contractors to accomplish their safety and sustainability objectives.
In the United States the American Society of Mechanical Engineers is the dominant standards developer of elevator and escalator system best practice titles; its breakdown of technical committees listed in the link below:
As always, we encourage facility managers, elevator shop personnel to participate directly in the ASME Codes & Standards development process. For example, it would be relatively easy for our colleagues in the Phoenix, Arizona region to attend one or more of the technical committee meetings; ideally with operating data and a solid proposal for improving the A17 suite.
All ASME standards are on the agenda of our Mechanical, Pathway and Elevator & Lift colloquia. See our CALENDAR for the next online teleconferences; open to everyone. Use the login credentials at the upper right of our home page.
Issue: [11-50]
Category: Electrical, Elevators, #WiseCampus
Colleagues: Mike Anthony, Jim Harvey, Richard Robben, Larry Spielvogel
Today we veer (slightly) from our primary interest in interoperability standards to explore the moment in best practice discovery and promulgation in the hardware supporting the artificial intelligence zietgeist. Use the login credentials at the upper right of our home page.
Power Distribution Units (PDUs) are critical in data centers, serving as the backbone for reliable power management. They distribute electricity from the main power source to servers, networking equipment, and other devices, ensuring consistent and stable power delivery.
PDUs offer features like load balancing, surge protection, and remote monitoring, which optimize energy efficiency and prevent outages. By providing multiple outlets and circuit protection, they safeguard expensive equipment from power fluctuations. Advanced PDUs enable real-time data tracking, aiding in capacity planning and fault detection.
Ultimately, PDUs ensure uptime, operational efficiency, and scalability in data centers. We track, and sometimes participate, in the standards setting for these organizations develop the key standards that govern PDU design, safety, efficiency, and interoperability, influencing global manufacturing compliance:
UL (Underwriters Laboratories): Establishes safety standards like UL 60950-1 for IT equipment, ensuring PDUs prevent hazards in high-density environments.
IEC (International Electrotechnical Commission): Develops core electrical standards such as IEC 60950-1 and IEC 62368-1 for low-voltage safety and audio/video/IT equipment, critical for PDU power handling.
ENERGY STAR (U.S. EPA): Sets efficiency benchmarks for PDUs, promoting low-loss designs to minimize data center energy waste (up to 12% savings).Related:
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/njrDAbSpwBpic.twitter.com/GkAXrHoQ9T
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