Canadian Electrical Industry News Week

Feb 7, 2021

LightingBy Craig DiLouie

While “circadian lighting” varies in definition, it generally refers to design that uses intensity and spectrum of light for a non-visual effect — namely, to support regulation of circadian rhythms. A new study suggests that by enabling intensity and spectral adjustment and optimizing exposure based on time of day, designers and owners can minimize the energy trade-off imposed by associated typically much higher light levels. This would entail use of an advanced lighting control system capable of scheduled dimming and perhaps spectral emission adjustment.

Circadian lighting, or biologically effective lighting, is the culmination of decades of research, though as a design practice it is new to the lighting industry. As such, it’s evolving as ongoing research is incorporated. In the meantime, the WELL Building Standard V.2, UL Design Guideline 24480, and the Collaborative for High-Performance Schools (CHPS) Core Design Criteria 3.0 all provide lighting design recommendation and goalposts for circadian lighting implementation.

In some cases, the guidelines significantly vary, either in the primary metric used or in the target values. The primary metrics used in these guidelines are equivalent melanopic flux (EML) and circadian stimulus (CS). As an example of variation in target values, at the time the study was published, the WELL Education Pilot recommended EML ≥ 125 m-lux as an appropriate stimulus four hours per day, while CHPS recommended that EML ≥ 250 m-lux was needed. As a result, it is difficult to say what “effective implementation” truly means, as again the guidelines vary and continue to evolve as new research becomes available and is incorporated.

Meanwhile, a key question in making these guidelines actionable is the potential impact on energy use, as they may pose significant increases in indoor light levels.

This was the focus of a new study by the Pacific Northwest National Laboratory (PNNL), which evaluated energy use in simulated designs attempting to comply with the guidelines. Funded by the U.S. Department of Energy, the study found significant increases in indoor light levels and associated energy consumption, suggesting an energy tradeoff in realizing circadian lighting goals.

PNNL modeled an open office and classroom, varying light output, spectral emission, light distribution, task orientation, duration of stimulus exposure, and more in a series of simulations totaling 45 unique conditions. The researchers determined that current IES task light level recommendations did not satisfy EML and CS targets for either office or classroom environments.

Lighting

“In some cases, meeting the circadian metric recommendations required an average illuminance that was more than double the IES recommendations, which may negatively affect lighting quality and increase energy use,” noted the study’s authors in their report. Satisfying circadian metric recommendations in some cases also required correlated colour temperatures (CCTs) much higher than typically used in open offices and classrooms.

Overall, PNNL estimated a 10-100%increase in annual energy use depending on the number of hours per day the circadian guideline is met. The more conservative energy estimates, closer to 10-15%, involved limiting duration of circadian stimulus to four hours per day, which would most effectively be implemented using an advanced lighting control system providing what is sometimes referred to as “light showers.”

Tunable-white offers utility for circadian stimulus but presents its own trade-offs of increased complexity and modestly higher energy consumption. Another option to reduce the required quantity of electric light is daylight, though that has its own challenges, notably variability in daylight availability.

So will lighting controls be key to unlocking the potential of circadian lighting? As again the field is evolving, this remains to be seen. The study authors noted that the energy trade-off cannot be fully expressed until circadian lighting metrics and effective stimulus delivery are better understood.

As circadian lighting may require higher indoor light levels, however, advanced controls are certainly well positioned for their ability to automatically adjust intensity and spectrum based on time of day.

As shown by this study, limiting the duration of circadian stimulus by adjusting intensity and spectrum can support circadian lighting implementations while minimizing the energy trade-off. As such, lighting controls will be considered along with other factors in future research that may be undertaken to explore the trade-off and how it can be mitigated. And lighting controls should be considered when seeking to implement current circadian lighting guidelines.

Read the study here www.energy.gov/sites/prod/files/2020/08/f77/ssl-safranek-etal-2020_EnergyBuildings_energy-impact.pdf.

Craig DiLouie, L.C., is a lighting industry journalist, analyst and marketing consultant. Learn more at ZINGinc.com http://www.zinginc.com/  and LightNOWblog.com.​

Published with the permission of Lighting Controls Association.

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www.liteline.com

 

 

 

 


 

Canadian Electrical Contractor Discussion Group: Can You Count the Deficiencies?

EIN CECD 400Have you ever been called to fix the work of a 'handyman'?

"Was supposedly done by a"certified ' electrician....told the homeowner that he got a $266 permit....no record at TSBC. Can you count the deficiencies?"

"There is a second panel change in the triplex also.......even more deficiencies. Think the guy was a glorified handyman. Ones not obvious: 240 BB heat hooked up 120....drier on 2p20....range on 2p50....water heater fed with 2c14 Bx on 2p15."

Go HERE to join the discussion

 


 

Surgelogic RecallProduct: Surgelogic™ NQ SurgeLoc™ Surge Protection Device.

Issue: The Surgeloc Surge Protection Device can experience an arc event, which can result in a fire hazard.

What to do: Consumers should immediately stop using the recalled surge protection devices and contact Schneider Electric for instructions on receiving a free equivalent replacement surge protector.

 

 

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Terry BeckerBy Terry Becker, P.Eng., CESCP, IEEE Senior Member

The electric shock hazard has been neglected.  Journeyman Electricians have accepted been shocked as part of the job, a “right” of passage, a badge of honour. 

This has not been acceptable and Journeyman Electricians may not be aware of the long term sequela health effects of receiving multiple low voltage electrical shocks and how it may have impacted them.  With respect to treatment there is only a single formal recognized treatment centre in Canada, the St Johns Rehab Centre. Electrical Injury Program.

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EIN Code Quiz 2Take this opportunity to test your knowledge of the Canadian Electrical Code - Part 1. Here are two questions on essential electrical systems: health care. 

You'll find the answers in EIN articles written by our code experts — mainly Bill Burr and Terry Becker — and of course in your own best practices. Answers will be posted on our website in a few days and published in our next issue. Good luck and share your results with our Facebook group: Canadian Electrical Contractor Discussions.

 

 

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Product News

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Extech Non-Contact High Voltage DetectorFLIR Systems has announced the availability of the Extech DV690 its first non-contact high voltage detector with a detection range of up to 69,000 volts (69 kV). The industrial-grade DV690 provides early warning alerts of energized electrical components for utility lineworkers, telecommunications installers, first responders, search and rescue teams, and tree removal services.

The DV690 features five flexible mounting options: handheld, around the neck, clipped to a belt, strapped to an arm, or attached to a universal spline hot stick. The three handsfree possibilities allow the most optimal operation to efficiently and carefully complete a job. Using a hot stick creates a safer distance to target, extending operator reach.

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Milwaukee Radius Compact Site LightThe M18 RADIUS Compact Site Light with Flood Mode provides a two-in-one solution for area and task lighting with less to carry. The compact LED light delivers 2,200 lumens in area mode and 1,000 lumens in flood mode. The light offers up to 16 hours of run-time with the option to be plugged in using the AC inlet for extended run-time.

Its compact size allows you to take this site light on and off the jobsite effortlessly and its 4-1/4" metal hanging hook allows you to easily hang the light overhead. The durable light is equipped with a high impact polycarbonate lens to withstand harsh jobsite abuse. The LEDs never need to be replaced and are backed by a limited lifetime warranty. 

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Panel PC1200With the Panel PC 1200, B&R introduces a compact and cost-effective all-in-one PC. Equipped with the latest Intel Atom processors and up to 256 GB of mass storage, the Panel PC 1200 is ideal for running HMI applications under Windows or Linux operating systems.

With 2x Gigabit Ethernet and 2x USB 3.0, the Panel PC 1200 is ready for integration into any machine network. Compact CFast cards are used for data storage.

 

 

 

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Peers & Profiles

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EIN Green 100 400

By Blake Marchand

This past December Jennifer Green was honoured with Canada’s Most Powerful Women Top 100 Award for the Skilled Trades category by WXN (Women’s Executive Network).

“It is truly an honour to be recognized by WXN and to be among this group of amazing women,” said Green of earning the distinction. “Throughout my career, I’ve worked with many great mentors and team members – to them, I say thank you for always inspiring me. I am absolutely thrilled.” Green is an industrial mechanic millwright by trade and works with Skills Ontario as Director of Competitions and Young Women’s Initiatives. 

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Jo Istanbul Four Seasons ABy Owen Hurst

Recently, Electrical Industry Canada has developed a relationship with Women in Renewable Energy (WiRE), a non-for-profit group developing resources and networking potential for women and all working or planning to work within the renewable energy sector. Aside from being the WiRE President & CEO, Joanna Osawe is the Global Business Development Manager of Major Projects for DMC Power Inc.

EIN sat down with Osawe to learn more about WiRE and the substantial benefits it provides. Joanna is very personable and open regarding her career and her ambition, as well as the opportunities she is developing for women nationally and globally. 

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Stephanie SmithBy Blake Marchand

“It was quite surprising,” said Stephanie Smith of being named EHRC’s Leader of the Year. “Leadership in 2020 has certainly been a challenge for everybody in the world let alone the nuclear industry or the electricity industry.”

An engineer by trade, Smith spent the majority of her career with Ontario Power Generation (OPG). She was the first woman to be certified by the Canadian Nuclear Safety Commission at the Pickering Nuclear Generating Station where she served as Plant Manager and was recently named the first President and CEO of CANDU Owners Group. Smith is also a passionate advocate for diversity and inclusion.

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