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rect connections; to overloading; to reduced input
voltage which results when small size wires are used
in the supply circuit, or when the supply circuit is
very long. Always check connections, load and supply
circuit when the motor fails to perform satisfactorily.
Although the motor is designed for operation on volt-
age and frequency specified on motor nameplate,
normal loads can be handled safely with voltages at
the motor of not more than
10%
above or below the
nameplate voltage.
6. Common Causes of Low Voltage Are:
a. Overloading of house or shop circuits with lights,
electrical appliances or other motors.
b. Undersized wires in supply circuits or extension
cords.
c. General overloading of the power company's facili-
ties. (In many sections of the country, demand for
electrical power exceeds the capacity of existing
generating and distribution systems. If it is sus-
pected that voltage being supplied is low, request
a voltage check from the power company.)
7. Some Effects of Low Voltage Are:
a. Motor fails to develop full power. (The power out-
put of motor decreases rapidly with decrease in
voltage at motor terminals.)
b. Motor starts slowly or fails to come up to full speed.
c. Motor overheats.
d. Motor burns out when operated for long periods of
time.
e. Frequent opening of fuses or circuit breakers. (This
may also result if motor is overloaded, or if the
motor circuit is fused with a fuse other than those
recommended.)
4
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