Research PanelIR 4555 User Manual page 30

TM
Model 4555 PanelIR User Manual
Three Phase Balanced Loads
Research, Inc.
A three-phase load is one where the load for all three phases dissipates the same power.
In the case of the Model 4555, there should be an equal number of the same wattage
lamps connected to each phase.
The line current for three phase loads can be calculated using one of the following
methods:
1. Determine the power dissipated per lamp.
2. Determine the number of lamps.
3. Calculate the total power dissipated in the load.
4. Calculate the line current:
Line Current =
Example: Assume quantity 3 Model 4555-25-12 using 2500T3 lamps connected to a
480 volt source (see Figure A-3).
1. The power dissipated by a 2500T3 lamp is 2.5 kW, or 2500 watts, when
connected to a 480 volt source.
2. The number of lamps in each Model 4555-25-12 is 12. Quantity 3 Pyropanels X
12 lamps = 36 lamps total.
3. Load power = 2,500 Watts dissipated per lamp X 36 lamps = 90,000 Watts
90,000 Watts Load Power
4. Line Current =
480 Volts Applied X 1.73
27
Load Power
Applied Voltage X 1.73
= 108 Amperes.
Appendix A