I
nternational Electrotechnical Commission
Glossary
Electropedia
Terms defined in
IEC 60947-1
2.1.1
switchgear and controlgear
2.1.2
switchgear
2.1.3
controlgear
2.1.4
over-current
2.1.5
short circuit
2.1.6
short-circuit current
2.1.7
overload
2.1.8
overload current
2.1.9
ambient air temperature
2.1.10
conductive part
2.1.11
exposed conductive part
2.1.12
extraneous conductive part
2.1.13
live part
2.1.14
protective conductor (symbol PE)
2.1.15
neutral conductor (symbol N)
2.1.16
enclosure
2.1.17
integral enclosure
2.1.18
utilization category (for a switching device or a fuse)
2.1.19
isolation (isolating function)
2.1.20
electric shock
2.1.21
manufacturer
2.1.22
solid insulation
2.1.23
insulation coordination barrier
2.2.1
switching device
2.2.2
mechanical switching device
2.2.3
semiconductor switching device
2.2.4
fuse
2.2.5
fuse-link
2.2.6
fuse-element
2.2.7
fuse-combination unit
2.2.8
disconnector
2.2.9
switch (mechanical)
2.2.10
switch-disconnector
2.2.11
circuit-breaker
2.2.12
contactor (mechanical)
2.2.13
semiconductor contactor (solid-state contactor)
2.2.14
contactor relay
2.2.15
starter
2.2.16
control circuit device
2.2.17
control switch (for control and auxiliary circuits)
2.2.18
pilot switch
2.2.19
push-button
2.2.20
terminal block
2.2.21
short-circuit protective device (SCPD)
2.2.22
surge arrester
2.2.23
individual enclosure
2.3.1
pole of a switching device
2.3.2
main circuit (of a switching device)
2.3.3
control circuit (of a switching device)
2.3.4
auxiliary circuit (of a switching device)
2.3.5
contact (of a mechanical switching device)
2.3.6
contact piece
2.3.7
main contact
2.3.8
arcing contact
2.3.9
control contact
2.3.10
auxiliary contact
2.3.11
auxiliary switch (of a mechanical switching device)
2.3.12
"a" contact – make contact
2.3.13
"b" contact – break contact
2.3.14
relay (electrical)
2.3.15
release (of a mechanical switching device)
2.3.16
actuating system (of a mechanical switching device)
2.3.17
actuator
2.3.18
position indicating device
2.3.19
indicator light
2.3.20
anti-pumping device
2.3.21
interlocking device
2.3.22
connecting device
2.3.23
terminal
2.3.24
screw-type terminal
2.3.25
screwless-type terminal
2.3.25.1
universal terminal
2.3.25.2
non-universal terminal
2.3.25.3
push-wire terminal
2.3.26
clamping unit
2.3.26.1
universal clamping unit
2.3.26.2
non-universal clamping unit
2.3.27
unprepared conductor
2.3.28
prepared conductor
2.3.29
multiple tip contact system
2.3.29
solid conductor
2.3.30
minimum cross-section
2.3.30
stranded conductor
2.3.31
maximum cross-section
2.3.31
rigid conductor
2.3.32
electronically controlled electromagnet
2.3.32
flexible conductor
2.4.1
operation (of a mechanical switching device)
2.4.2
operating cycle (of a mechanical switching device)
2.4.3
operating sequence (of a mechanical switching device)
2.4.4
manual control
2.4.5
automatic control
2.4.6
local control
2.4.7
remote control
2.4.8
closing operation (of a mechanical switching device)
2.4.9
opening operation (of a mechanical switching device)
2.4.10
positive opening operation (of a mechanical switching device)
2.4.11
positively driven operation
2.4.12
dependent manual operation (of a mechanical switching device)
2.4.13
dependent power operation (of a mechanical switching device)
2.4.14
stored energy operation (of a mechanical switching device)
2.4.15
independent manual operation (of a mechanical switching device)
2.4.16
independent power operation (of a mechanical switching device)
2.4.17
actuating force (moment)
2.4.18
restoring force (moment)
2.4.19
travel (of a mechanical switching device or a part thereof)
2.4.20
closed position (of a mechanical switching device)
2.4.21
open position (of a mechanical switching device)
2.4.22
tripping (operation)
2.4.23
trip-free mechanical switching device
2.4.24
instantaneous relay or release
2.4.25
over-current relay or release
2.4.26
definite time-delay over-current relay or release
2.4.27
inverse time-delay over-current relay or release
2.4.28
direct over-current relay or release
2.4.29
indirect over-current relay or release
2.4.30
overload relay or release
2.4.31
thermal overload relay or release
2.4.32
magnetic overload relay or release
2.4.33
shunt release
2.4.34
under-voltage relay or release
2.4.35
reverse current relay or release (d.c. only)
2.4.36
operating current (of an over-current relay or release)
2.4.37
current-setting (of an over-current or overload relay or release)
2.4.38
current setting range (of an over-current or overload relay or release)
2.5.1
nominal value
2.5.2
limiting value
2.5.3
rated value
2.5.4
rating
2.5.5
prospective current (of a circuit and with respect to a switching device or a fuse)
2.5.6
prospective peak current
2.5.7
prospective symmetrical current (of an a.c. circuit)
2.5.8
maximum prospective peak current (of an a.c. circuit)
2.5.9
prospective making current (for a pole of a switching device)
2.5.10
prospective breaking current (for a pole of a switching device or a fuse)
2.5.11
breaking current (of a switching device or a fuse)
2.5.12
breaking capacity (of a switching device or a fuse)
2.5.13
making capacity (of a switching device)
2.5.14
short-circuit breaking capacity
2.5.15
short-circuit making capacity
2.5.16
critical load current
2.5.17
critical short-circuit current
2.5.18
Joule integral (
I
2
t
)
2.5.19
cut-off current – let-through current
2.5.20
time-current characteristic
2.5.21
cut-off (current) characteristic – let-through (current) characteristic
2.5.22
over-current protective co-ordination of over-current protective devices
2.5.23
over-current selectivity
2.5.24
back-up protection
2.5.25
take-over current
2.5.26
short-time delay
2.5.27
short-time withstand current
2.5.28
peak withstand current
2.5.29
conditional short-circuit current (of a circuit or a switching device)
2.5.30
conventional non-tripping current (of an over-current relay or release)
2.5.31
conventional tripping current (of an over-current relay or release)
2.5.32
applied voltage (for a switching device)
2.5.33
recovery voltage
2.5.34
transient recovery voltage (abbreviation TRV)
2.5.35
power-frequency recovery voltage
2.5.36
d.c. steady-state recovery voltage
2.5.37
prospective transient recovery voltage (of a circuit)
2.5.38
peak arc voltage (of a mechanical switching device)
2.5.39
opening time (of a mechanical switching device)
2.5.40
arcing time (of a pole or a fuse)
2.5.41
arcing time (of a multipole switching device)
2.5.42
break time
2.5.43
make time
2.5.44
closing time
2.5.45
make-break time
2.5.46
clearance
2.5.47
clearance between poles
2.5.48
clearance to earth
2.5.49
clearance between open contacts (gap)
2.5.50
isolating distance (of a pole of a mechanical switching device)
2.5.51
creepage distance
2.5.52
working voltage
2.5.53
temporary overvoltage
2.5.54.1
switching overvoltage (transient overvoltage)
2.5.54.2
lightning overvoltage (transient overvoltage)
2.5.54.3
functional overvoltage (transient overvoltage)
2.5.55
impulse withstand voltage
2.5.56
power-frequency withstand voltage
2.5.57
pollution
2.5.58
pollution degree (of environmental conditions)
2.5.59
micro-environment (of a clearance or creepage distance)
2.5.60
overvoltage category (of a circuit or within an electrical system)
2.5.61
co-ordination of insulation
2.5.62
homogeneous (uniform) field
2.5.63
inhomogeneous (non-uniform) field
2.5.64
tracking
2.5.65
comparative tracking index (CTI)
2.5.66
rated control circuit voltage, (
U
c
)
2.5.67
rated control circuit supply voltage, (
U
s
)
2.6.1
type test
2.6.2
routine test
2.6.3
sampling test
2.6.4
special test
2.7.1
port
2.7.2
enclosure port
2.7.3
cable port
2.7.4
functional earth port
2.7.5
signal port
2.7.6
power port (control supply port)
2.7.7
main port
K.2.1.1
reliability (performance)
K.2.1.2
useful life
K.2.1.3
constant failure rate period
K.2.1.4
overall lifetime
K.2.1.5
censoring
K.2.1.6
suspension
K.2.1.7
no-make-break-current utilization
K.2.1.8
time to failure
O.3.1
design and development
O.3.2
environment
O.3.3
environmental aspect
O.3.4
environmental impact
O.3.5
environmental parameter
O.3.6
environmentally-conscious design, ECD
O.3.7
environmentally conscious design tool
O.3.8
life cycle
O.3.9
life cycle assessment, LCA
O.3.10
life cycle stage
O.3.11
life cycle thinking, LCT
O.3.12
organization
O.3.13
process
O.3.14
product
O.3.15
product category
O.3.16
stakeholder
O.3.17
recycling
O.3.18
recyclability
O.3.19
end of life, EOL
O.3.20
energy recovery
U.1.1
external control device
V.3.1
energy management
V.3.2
energy management system, EnMS
V.3.3
electrical energy efficiency
V.3.4
energy efficiency
V.3.5
load
V.3.6
peak shaving
V.3.7
load shedding
W.4.1
declarable substance
W.4.2
declarable substance group
W.4.3
homogeneous material
W.4.4
material class
W.4.5
material declaration