
10
HOW TO USE THE FORMULA: EXAMPLE: With voltage of 220, 216, and 213
1) Average Voltage = 220 + 216 + 213 = 649 / 3 = 216
2) Maximum Voltage Deviations from Average Voltage = 220 - 216 = 4
Percent voltage unbalance MUST NOT exceed 2%.
3) Percent Voltage Unbalance = 100 x = = 1.8%
4
216
400
216
3) PERCENT VOLTAGE
UNBALANCE
2) MAXIMUM VOLTAGE DEVIATIONS
FROM AVERAGE VOLTAGE
1) AVERAGE VOLTAGE
=100 x
electric heaters or the furnace.
1.
2.
open position.
3.
4.
6.
9.
10.
11.
12.
the unit trips.