1.4 Equipment Load Profiles. After obtaining the total building electrical
power load records, the next step is to test individual pieces of equipment.
These tests determine what each individual piece of equipment is contributing
to the total electrical power load, and whether it is operating within
1.4.1 Equipment Monitoring. If electrical power consumption is excessive,
the equipment may be overloaded or faulty. If equipment is drawing more
current than expected, it may indicate the need for a more efficient motor.
Answers to such questions are especially informative in interpreting
performance of automatically-operated equipment. The record shows when and
how long each machine was operated and how long it was idle. It discloses
waste if automatic equipment is not functioning properly. Monitoring
individual equipment will answer the following questions;
(a) What are maximum, minimum, and average loads for the equipment? Are
they within specifications?
(b) If the motor is not the correct size, what is the horsepower of the
motor that should replace it?
(c) Is there sufficient voltage at the motor terminals?
(d) How much does the unit contribute to peak load?
(e) Could the equipment schedule be rearranged to reduce peak load?
(f) Is load on a unit a contributor to any loss of productive effort
shown by the department record?
(g) What is the idle load of this unit?
(h) Does the idle load show any marked increase since the last survey?
(i) Does the record show any characteristic which indicates a faulty
condition in the motor or the associated equipment?
(j) How does the record compare with other records of similar equipment?
(k) Does the record show any data valuable in reducing energy consumption?
2. INTERNAL SURVEYS. Assuming that improvements seem possible, then further
investigation must be carried out to determine what load makeups are causing
the demand peaks and what can be done to shift load combinations to reduce
2.1 Demand Survey Example. Each electrical system is different, but they all
spread out like a pyramid, with total facility information available at the
peak and more detailed information available as the base is approached. At
whatever point a demand analysis is made, it must be carried out for a full