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Plug Load Control

Plug load control comes in two basic forms. Energy savings are achieved when the device is either transitioned to a low-power state, or it is de-energized to eliminate the power draw. Both can be executed either manually or automatically. A low-power state is between a de-energized state and a ready-to-use state. This includes standby, sleep, and hibernate modes as well as any “off” state that has a parasitic power draw. A de-energized state is when electricity is not being provided to the device. This is analogous to physically unplugging a device’s power cord from a standard electrical outlet.

The most prevalent plug load contral strategies include:


Manual Control: Most plug-loads can be manually powered down with built-in power buttons, shutdown procedures, or a control device that energizes and de-energizes electrical outlets based only on manual input. The effectiveness of manual control depends entirely on user behavior and should be implemented only if no other methods apply.


Automatic Low-Power State: The first, and in some cases most effective, control method is a built-in, automatic low-power state functionality such as standby or sleep. Some manufacturers include this functionality to reduce energy consumption of idle devices. Internal processes monitor idle time, and when the device has been in an idle state for a given period, it will power down to a low-power state.


Schedule Timer Control Device: Certain plug-loads have predictable load profiles. These devices are used during the same times each day or at regular intervals. A scheduling-control device can effectively manage a predictable plug-load. It applies user-programmed schedules to de-energize the plug-load to match its use pattern and energize the plug-load so that it is ready for use at the time when it is required.


Load-Sensing Control Device: Plug loads may have a primary-secondary relationship. A primary device, such as a computer, operates independently of other (slave) devices. A secondary device, such as a monitor or other peripheral, depends on the operation of other (master) devices. A load-sensing control device should be implemented for such a relationship. It automatically energizes and de-energizes secondary devices based on the “sensed” power load of the primary device(s). Whenever the primary device goes into a power state below a given threshold, the load-sensing control can power down the secondary devices. The sensed (primary) load is typically an electrical outlet or an auxiliary port (e.g., universal serial bus (USB) in the case of a computer).


Occupancy-Control Device: Occupancy control can save a great deal of energy as it energizes plug-loads only when users are present and de-energizes them when the space is vacant. This approach pinpoints the main source of wasted energy during non-business hours and reduces wasted energy during business hours. However, the largest drawback is that occupancy controlled devices may energize and de-energize outlets at inappropriate times.


Manual-On, Vacancy-Off Control Device: A manual-on, vacancy-off control device is a slight modification of the occupancy-control device. It energizes a plug-load when it receives manual input from a user and de-energizes the plug-load automatically based on lack of occupancy. This control should be implemented for plug-loads that are needed only when users are present (e.g., task lights, monitors, and laptops).

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53 Results : Plug Load Control

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  • MaterialDetails - GSA Sustainable Facilities Tool

    Manual Control Description Most plug-loads can be manually powered down with...buttons, shutdown procedures, or a control device that energizes and de-energizes
    https://sftool.gov › material › 2164 › manual-control
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    ...facilitate conversion to renewable energy? Load reduction. Develop policies and active...installing (or programming) automatic controls. Examples include: Vacancy or occupancy
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  • ISWG

    ...building Plug and process loads not included in modeling Lighting controls not...effectively Legacy data center Plug and Process Loads ENERGY STAR rating dropped
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  • Other Useful GPC Links - GSA Sustainable Facilities Tool

    Useful GPC Links Share Did You Know? Plug loads can average approximately 30% of...attributed to parasitic loads (power draw of a plug-load that is not performing
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    ...light and lighting controls by floor or by zones, plug loads by floor or by zone...electrical equipment, critical HVAC controls? Is there sub-metering for all water-intensive
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    ...33% Small Office DHW HVAC Lighting Plug Loads 6U.S. DEPARTMENT OF ENERGY OFFICE...33% Small Office DHW HVAC Lighting Plug Loads HWTM 7U.S. DEPARTMENT OF ENERGY OFFICE
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  • Slide 1

    ...implemented total cost $2.3M Install Controlled outlets Develop and Apply Unique...Unique schedules for lighting, plug loads, temperature setpoints and fans base on
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    ...indoor environmental quality and plug loads View system bundling opportunities
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  • About - GSA Sustainable Facilities Tool

    ...everything from water efficiency to plug load reduction. Click through annotated
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