Specifications

85
Ground A connection to the earth or to a conductive object such as an
equipment chassis.
Service Entrance
Load Center
Transformer Secondary
Neutral Bonded to Enclosure
Grounding Electrode Conductor
Grounding Electrode
Neutral
Ground Fault A condition in which current takes an unintentional path to
ground. Ground faults can endanger people and damage
equipment. For this reason, some circuits are equipped with a
ground fault circuit interrupter (GFCI).
Ground Fault Circuit A device designed to interrupt current in a circuit if a ground
Interrupter (GFCI)
fault is sensed. If a GFCI is installed near the receptacles it
protects, overcurrent protection is required separately. A GFCI
circuit breaker combines protection for ground faults, overloads,
and short circuits in one device.
120 Volts
Ground
Ground Fault Circuit Interrupter
Trip Coil
Sensing and
Test Circuit
Hot Wire
Neutral
TEST
TYPE
QPF
Harmonics The base frequency produced by a circuit is said to be the
fundamental frequency or first harmonic. Additional harmonics
are multiples of the first harmonic. The 3rd harmonic of a 60 Hz
power supply, for example, is 3 x 60 Hz = 180 Hz.