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GMC-I Messtechnik GmbH
11
10.1
R
SL
/ RPE – Protective Conductor Resistance
Definition
Protective conductor resistance is the sum
of the following resistances:
•
Connector cable or device connector
cable resistance
•
Contact resistance at plug and terminal
connections
•
Extension cord resistance if applicable
Resistance is measured:
•
Between each exposed
conductive part of
the housing
and the earthing contacts at
the mains and the device plug (if a
removable mains connector cable is
used), or the protective conductor termi-
nal for permanently installed devices.
•
Between the earthing contacts at the
mains plug and the earthing contacts at
the device plug for
device connector cables
•
Between the earthing contacts at the
mains plug and the earthing contacts at
the coupling socket for
extension cords
Maximum Permissible Limit Values for the
Protective Conductor Resistance of Con-
necting Cables up to 5 Meters Long per
DIN VDE 0701-0702:2008
1
This value may not exceed 1
for permanently
connected data processing systems (DIN VDE 0701-
0702).
2
Total protective conductor resistance: max. 1
Notes
Insulation resistance and/or leakage current
must be measured at all exposed, conduc-
tive parts for protection category II and III
devices, as well as for battery powered
devices.
Batteries must be disconnected during test-
ing of battery powered devices.
10.1.1 Connection Type Selection
Plug
Permanent
connection
See section 10.1.3
Probe-probe
See section 10.1.4
Rsl balancing
Test Current
Open-Circuit
Voltage
R
SL
Housing – Mains
Plug
> 200 mA
4 V < U
L
< 24 V
0.3
1
+ 0,1
2
for each addi-
tional 7.5 m