Bryant 558J Series Installation Instructions Manual page 41

Legend and Notes for Table 5
LEGEND:
BRKR --- Circuit breaker
CO --- Convenient outlet
DISC --- Disconnect
FLA --- Full load amps
IFM --- Indoor fan motor
LRA --- Locked rotor amps
MCA --- Minimum circuit amps
PE --- Power exhaust
PWRD CO --- Powered convenient outlet
UNPWR CO --- Unpowered convenient outlet
NOTES:
1. In compliance with NEC requirements for multimotor and
combination load equipment (refer to NEC Articles 430 and
440), the overcurrent protective device for the unit shall be
fuse or HACR breaker. Canadian units may be fuse or circuit
breaker.
2. Unbalanced 3-Phase Supply Voltage
Never operate a motor where a phase imbalance in supply
voltage is greater than 2%. Use the following formula to
determine the percentage of voltage imbalance.
max voltage deviation from average voltage
% Voltage Imbalance = 100 x
average voltage
Example: Supply voltage is 230-3-60
AB = 224 v
BC = 231 v
AC = 226 v
(224 + 231 + 226)
Average Voltage =
3
= 227
Determine maximum deviation from average voltage.
(AB) 227 – 224 = 3 v . . . . . . . . . . Maximum deviation is 4 v.
(BC) 231 – 227 = 4 v . . . . . . . . . .
% Voltage Imbalance = 100 x
= 1.76%
This amount of phase imbalance is satisfactory as it is below the maximum
allowable 2%.
IMPORTANT: If the supply voltage phase imbalance is more than 2%, con-
tact your local electric utility company immediately.
41
681
=
3
Determine percent of voltage imbalance.
4
227