General Information
6 Owner’s Manual for Stationary Industrial Generators
2.1.3— Voltage Code
The letter following the kilowatt rating in the model identification code is the voltage code. The voltage code indicates
the following:
2.2 — Equipment Description
This equipment is a revolving field, alternating current type generator set. The generator is designed to supply electrical
power for the operation of compatible electrical loads when the utility power supply is not available or has dropped to
an unacceptable level.
The generator’s revolving field is directly connected to and driven by an engine by means of flexible discs or a gearbox.
Generators with a four-pole rotor are driven at a rated speed of 1,800 rpm to supply a frequency of 60 Hertz. Four-pole
rotors operating at 50 Hertz are driven at 1,500 rpm.
Refer to the data label affixed to the unit for rated AC voltage, wattage, amperage, number of phases, etc. See Subsec-
tion 2.1.2 for an explanation of how to identify the unit’s features.
2.2.1— Standard Generator Features
The generator incorporates the following features:
• The rotor insulation system is Class “H” rated, and the stator insulation is Class “H” rated as defined by NEMA
MG1-22.4 and NEMA MG1-1.65.
• The generator is self-ventilated and drip-proof constructed.
• The voltage waveform deviation, total harmonic content of the AC waveform and “telephone influence factor”
have been evaluated and are acceptable according to NEMA MG1-22.
• All prototype tested models have passed three-phase symmetrical short circuit test to ensure system protection
and reliability.
2.2.2— Generator and Load Compatibility
The generator must be fully compatible with the rated voltage, phase, and frequency of the connected electrical loads.
The generator, connected electrical devices, or both, can be damaged if voltage, phase, and frequency are not compat-
ible.
Code Description
A 120/240 volts, single-phase, four-lead, 60 Hz
D 120/240 volts, single- and three-phase, 12-lead, 60 Hz
G 120/208 volts, three-phase, 12-lead, 60 Hz Broad Range
H 231/400 volts, three-phase, 12-lead, 60 Hz Broad Range
J 120/240 volts, three-phase, 12-lead, 60 Hz Broad Range
K 277/480 volts, three-phase, 12-lead, 60 Hz Broad Range
L 346/600 volts, three-phase, six-lead, 60 Hz
M 110/220 volts, single-phase, four-lead, 50 hz
N 115/200 volts, three-phase, 12-lead, 50 Hz Broad Range
P 100/200 volts, three-phase, 12-lead, 50 Hz Broad Range
R 231/400 volts, three-phase, 12-lead, 50 Hz Broad Range
S 277/480 volts, three-phase, six-lead, 50 Hz
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