Specifications

82
Distribution Section A switchgear, switchboard , or power panelboard section that
receives power from the service section and distributes power to
other circuits.
Service
Section
Distribution
Section
Duty Cycle The ratio of a device’s on time to its total cycle time. Duty cycle
is normally expressed as a percentage; therefore, a device with a
50% duty cycle is on half the time.
ON OFF ON OFF
10%
Duty Cycle
50%
Duty Cycle
Effective Value A measure of the amplitude of alternating current or voltage.
Also called the root-mean-square or RMS value. Test meters
used to measure alternating current or voltage usually display
effective values.
+
0
_
Peak Value
169.7 V
peak
169.7 V
peak
x 0.707 = 120 V
eff
(also expressed as VAC or Vrms)
Electrically Erasable A type of semiconductor memory often used for storage of
Programmable Read Only
data or programs that change less frequently than random
Memory (EEPROM) access memory. The contents of EEPROM chips are erased
with electrical pulses rather than with ultraviolet light as with
erasable programmable read only memory. EEPROMs retain
their contents when power is turned off.
Enclosure A protective housing. Guidelines for various types of electrical
enclosures are provided by the National Electrical Manufacturers
Association (NEMA) and the International Electrotechnical
Commission (IEC).