TM
5-811-1
AFJMAN
32-1080
GLOSSARY
Section I
Abbreviations
AEIC
part of a municipality. The area contains land use
Association of Edison Illuminating Companies.
which attracts a relatively heavy volume of night-
time vehicular and/or pedestrian traffic on a fre-
ANSI
quent basis.
American National Standards Institute.
Conventional energy system
ICEA
A conventional energy system supplies electric
Insulated Cable Engineers Association.
energy which is not generated by the user and
over which the user normally has only local
IEEE
control. Conventional energy systems are provided
Institute of Electrical and Electronic Engineers.
and supplied by a utility unless that electric
source has been clearly demonstrated to be inade-
IES
quate or unreliable, or another energy source has
Illuminating Engineering Society.
been proven to be more economical.
NEC
Dead front (as applied to switches, circuit
National Electrical Code (NFPA-70).
breakers, switchboards, and distribution panel-
NEMA
boards)
National Electrical Manufacturers Association.
So designed, constructed, and installed that not
current-carrying parts are normally exposed on the
NESC
front.
National Electrical Safety Code (ANSI C2).
Dead front (as applied to transformers)
Section II
So constructed that there are not exposed live
Terms
parts on the front of the assembly.
Angle of deviation (pole line)
Demand
The angle by which a pole line deviates from a
The electrical load at the receiving terminals
straight line.
averaged over a specified interval of time. Demand
is expressed in kilowatts, kilovolt-amperes, am-
Basic impulse insulation level (BIL)
peres, or other suitable units. The interval of time
A reference impulse insulation strength expressed
is generally 15 minutes, 30 minutes, or one hour.
in terms of the crest value of withstand voltage of
a standard full impulse voltage wave.
Demand factor
The radio of the maximum demand of a system to
Coincident demand
the total connected load of the system.
Any demand that occurs simultaneously with any
other demand, also the sum of any set of coinci-
Demand factor-(Max. demand)/(Total con-
dent demands.
nected load) Discharge current
The surge current that flows through an arrestor
Collector
when sparkover occurs.
The distributor and collector roadways servicing
traffic between major and local roadways These
Discharge voltage
are roadways used mainly for traffic movements
The voltage that appears across the terminals of
within residential, commercial, and industrial ar-
an arrester furring passage of discharge current.
eas.
Distribution transformer
Commercial
A transformer for transferring electrical energy
A business area of a municipality where ordinarily
from a primary distribution circuit to a secondary
there are many pedestrians during night hours.
distribution circuit or consumer's service circuit.
This definition applies to densely developed busi-
Distribution transformers are usually rated in the
ness areas outside, as well as within, the central
order of 5-500 kVA.
GLOSSARY 1
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