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The width of the daylight zone is stated to be 0.5 times the height of the fenestration from floor calculated from each edge of window, unless another window or full height wall is present within that distance. Per section C405.2.4.2, the primary daylight zone still extends into the space 1.0 times the height of the fenestration from floor and the secondary zone extends 2.0 times that height. It will be mandatory to have both a primary daylight zone and a secondary daylight zone where total fixture wattage exceeds 150W in each zone or 300W in both zones combined.
#ASHRAE 90.1 RECEPTACLE CONTROL CODE#
Below are the new requirements, their code sections, and calculation diagrams. The requirements for daylight responsive controls have moved closer to resembling those of Ashrae 90.1 and Title 24. Central control panels might be the best practice here if cost is a concern on the project, especially if panels are already being used for control elsewhere in the building. This is a huge change since this can increase control zone areas up to 5,000 square feet, allowing for significantly fewer devices in these spaces. However, there is now an exception available for open plan office spaces that allows them to go back to time based controls as defined in section C405.2.2.1. Open plan offices are still under the occupancy sensors requirements and they carry the same rule to have no one occupancy sensor zone greater than 600 square feet. The only current exception is for corridors that have less than two foot candles of light at their darkest point. However, switching of every other luminaire to get the 50% reduction is up for interpretation of what uniformly implies here. Automatic full off is acceptable as well, so that the cost of dimming controls won’t have to be added to these spaces. This would apply to all corridor lighting that is not considered to be specialty lighting, such as display case lighting. Sensors in corridors shall uniformly reduce the lighting output by no less than 50% within 20 minutes of vacancy. Corridors are no longer eligible to be controlled by time-clock means alone. Corridors are now required to be controlled by occupancy sensors. Below is a summary and code section reference for each: There have been a couple of major changes that surround the occupancy sensor portion of the code. We will focus on four main categories that carry the biggest impacts-occupancy sensors, daylight sensors, and completely new to the IECC, plug load controls and parking garage controls. Unlike the changes we witnessed when we jumped from 2015 IECC to 2018 IECC, which only had a few major updates, the 2021 IECC is considerably more impactful on lighting controls. With the slew of changes implemented, this likely will be achievable. At the end of January 2021, the latest version of the IECC was published and made available, and it is very likely that this 2021 code will be incorporated locally in the upcoming months, so let’s get ready! One of the big goals of the 2021 energy code is to increase energy savings by at least 10% over those possible under the 2018 IECC.
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Every three years we look forward to what the International Code Council will come up with for the new iteration of the International Energy Conservation Code.