Whole building power, lighting power, and plug loads are measured using digital power transducers. These sample voltage and current waveforms at high speed and have powerful digital signal processing, assuring true RMS (Root Mean Square) output accurate to 0.5 percent. The power transducers are used in conjunction with 600V class split-core current transformers (CT's).

The panels shown here are located in the basement. No additional wiring was necessary to measure plug and lighting load separately. The components of whole building power that are measured individually are lighting, plug load, and cooling power. These do not add up to the whole building power; approximately 100kW of power is not measured. 
 
 See also: Cooling Plant Power

Points Measured

Power (kW)
Physical Points (5)	Building Main Power, Lighting Load Riser One, Lighting Load Riser Two, Plug Load Riser One, Plug Load Riser Two
Calculated Points (2)	Lighting Load Riser Power, Plug Load Riser Power
Normalized Power (wsf)
Calculated Points (4)	Building Watts per Square Foot, Lighting Watts per Square Foot, Plug Load Watts per Square Foot, Cooling Load Watts per Square Foot

 Total Points: 5 physical; 6 calculated
 

	Power Transducer Accuracy	Current Transformer Accuracy	Combined Accuracy
Main - Whole Building (3 CT's)	0.50%	1.00%	1.50%
Light & Plug Risers (3 CT's each)	0.50%	0.50%	1.00%

Points Not Measured

These points are not metered independantly, but are included in Building Main Power:

Bank/Mezzanine Lighting, Bank/Mezzanine Plug Load, Bank/Mezzanine Air Handlers, 17th & 18th Floor Plug Load, Riser Elevator Powers, Domestic Hot Water Pumps, Pneumatic Air Compressor