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58 GMC-I Messtechnik GmbH
19.5 List of Abbreviations and their Meanings
RCCB (residual current circuit breaker)
IΔTripping current
IΔNNominal residual current
IFRising test current (residual current)
PRCD Portable residual current device
PRCD-S:
with protective conductor detection and monitoring
PRCD-K:
with undervoltage trigger and protective conductor monitor-
ing
RCD- Selective RCCB
RECalculated earthing or earth electrode loop resistance
SRCD Socket residual current device (permanently installed)
taTime to trip / breaking time
UIΔTouch voltage at moment of tripping
UIΔNTouch voltage relative to nominal residual current IΔN
ULTouch voltage limit value
Overcurrent Protective Devices
IKCalculated short-circuit current (at nominal voltage)
ZL-N Line impedance
ZL-PE Loop impedance
Earthing
RBOperational earth resistance
REMeasured earthing resistance
RELoop Earth electrode loop resistance
Low-Value Resistance at
Protective, Earthing and Bonding Conductors
RLO+ Bonding conductor resistance (+ pole to PE)
RLO Bonding conductor resistance (– pole to PE)
Insulation
RE(INS) Earth leakage resistance (DIN 51953)
RINS Insulation resistance
Current
IABreaking current
IMMeasuring current
INNominal current
IPTest current
Voltage
f Line voltage frequency
fNNominal voltage rated frequency
ΔU Voltage drop as %
U Voltage measured at the test probes during and after insu-
lation measurement RINS
UBatt (Rechargeable) battery voltage
UEEarth electrode voltage
UINS For measurement of RINS: test voltage, for ramp function:
triggering or breakdown voltage
UL-L Voltage between two phase conductors
UL-N Voltage between L and N
UL-PE Voltage between L and PE
UNNominal line voltage
U3~ Highest measured voltage during determination of phase
sequence
UYPhase voltage to earth
S
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