What Factors does NYE Entail in Preparation of Panel Board Scheduling?
The first step is to figure out the total list of loads within the “system” we have chosen. The “system” would be the facility or installation. Then the loads are to be specified as either process or non-process. Process loads and the non-process loads are the electrical loads supplied to the installation using the power system and are influenced by the load schedule. Moving on, the absorbed power, power factor, and efficiency is the parameters are required to design the panel board schedule.
ASHRAE suggests these loads are related to the manufacturing process, industrial process or some kind of commercial process, which is basically not related to providing the occupants with comfort. It can be the compressors, motors and so on.
These are the supplementary loads which help provide the occupants of a building with comfort and amenity. It can include the HVAC systems, the lighting, utility system and so on.
Generally, the information on absorbed load is not readily available. It is the approximate power that the load will “actually” draw; it’s always lower than the rated maximum capacity. Due to the fact that it’s not always clear, we take it as around 80 to 90 percent of the rated capacity.
This corresponds to the portions of the panelboard schedule that are reactive. If the power factor is not available there’s a convention to be used for each type of load, like for heater it’s 100%, for the motor, it’s 85% and so on.
Usually, the efficiencies of these loads lie in the range of 80% to 95%, and this efficiency corresponds to the difference in the amount of electrical energy obtained and how much of it is converted into the mechanical energy.