PQM - Power Quality Meter - An electronic device for measuring the characteristics of the incoming electricity interacting with the electrical equipment and devices that use it. Metrics can include transient voltages and currents, individual waveform capture, harmonic distortion, sag and swell monitoring, frequency variations, and power factor. , HUPS - House Uninterruptible Power Supply - A UPS that supports non-critical data center house services such as fire panels, security systems, and the BMS. See also UPS and HSDB., GEN - Generator - A machine that converts mechanical energy into electricity., AMCOP - Amazon Change-Over Panel - An Automatic Transfer Switch (ATS) used in Amazon data centers to switch between utility power and generator power when needed., UPS - Uninterruptible Power Supply  - A device that provides continuous, clean power to critical systems during short intervals when neither utility power nor backup generator power are stable.A device that provides continuous, clean power to critical systems during short intervals when neither utility power nor backup generator power are stable., PDU - Power Distribution Unit - (1) The combination transformer/breaker panel that is often used between a UPS supplying voltage higher than that used by the IT equipment and the cabinets. (2) A small device, similar to a power strip, that is used inside a rack to distribute power to the IT equipment., ATS - Automatic Transfer Switch - A transfer switch that is capable of automatic operation without operator intervention. An ATS usually has mechanical circuit breakers, as opposed to a faster, semiconductor-based static transfer switch., BW - Busway - A.k.a. ”bus duct"; a duct usually made of sheet metal that houses copper or aluminum busbars used for conducting large currents of electricity. Also referred to as bus duct., USB - Utility Switchboard  - the switchboard hardware that supports the pod’s critical load. The switchboard was previously referred to as main switchboard (MSB) and it is possible that equipment labels in separate pods within the same data center will use both of these acronyms., RUPS - Rack Uninterruptible Power Supply  - Eaton 9395 UPS that provides uninterruptible power to customer provided 200-230V racksA device that provides continuous, clean power to critical systems during short intervals when neither utility power nor backup generator power are stable., ROP - Rack Output Panel - It is the panel that provides power to all the customer specific rack receptacles above each rack., COP - Catcher Output Panel - A panel that distributes power from the catcher system to the PDUs or busway., MV - Medium Voltage - The utility voltage coming in from the power company , PDC - Power Distribution Cabinet  - A device that is intended to provide supply and redistribution of electrical energy, protection of electrical power lines and protection of the overload and short circuit currents. In addition, system allows measuring of energy consumption when equipped with power meters., BACOP - Back Stopping Control Panel  - Panel used to load shed in an emergency in order to avoid unintended impact on customer critical load (wiki), BKR - Breaker - A.k.a. "circuit-breaker": an automatically operated electrical switch that protects an electrical circuit from damage caused by overload or a short circuit., OAD - Outside Air Damper - controlling the quantity of outside air which is driven by the control strategy for ventilation, pressurization, and economization., WBT - Wet Bulb Temperature - The temperature of the air measured using this, which indicates the temperature to which a wet surface can be cooled by evaporation. Wet-bulb temperature is necessary in the design and use of cooling towers and evaporative pads., CHL - Chiller - A device that uses a heat exchange, a condensing section, and an expansion section to chill water for use in CRAH units., EVAP - Evaporator - A device that changes a low-pressure cold-liquid refrigerant back to a gas by evaporating the liquid. In a data center, evaporators are used in air-conditioning units and chillers as a means of removing heat generated by the IT equipment., MXC - Max Cooling - it’s Purge with an additional command. The additional command is, to turn on all the roof top condenser units (AC Units) to make the air colder when entering the data centeris a fail safe mechanism , PURGE  - Open outside air damper & Open Exhaust Dampers so the air comes in and pushes the hot air outside through the exhaust dampers., EF - Exhaust Fan - A fan that moves air out of a space or enclosure., AHU - Air Handling Unit - A device used to condition and circulate air as part of a heating, ventilating, and air-conditioning (HVAC) system. An air handler is usually a large metal box containing a blower, heating or cooling elements, filter racks or chambers, sound attenuators, and dampers., VFD - Variable Frequency Drive - A device that supplies AC power of varying frequency, typically used to control the speed of induction motors. In a data center, it is common to vary the speed of fans, pumps, and chillers., CAT - Cold Aisle Temperature - An aisle where rack fronts face into the aisle. When cooled airflow is directed into a cold aisle, it can enter the racks more efficiently., CHWP - Chilled Water Pump - A pump used to circulate chilled water in water-based cooling systems, CRAC - Computer Room Air Conditioning  - A computer room air handler that uses fans and chilled water passing through a heat exchange to remove heat from a data center., CRAHU - Computer Room Air Handling Unit  - a device within a data center that cools the air using a cooling coil filled with chilled water, IW - Industrial Water - Water that is used for industrial purposes, such as cooling, manufacturing, washing, etc.,

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