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30
6. Grid systems
Suitable grid systems and maximum rated voltag-
es according to DIN EN 61010-1/A1:
Three-phase 4-conductor systems
with grounded neutral conductor
L1
L2
L3
E
E
N
E
L1
L2
L3
E
N
R
L1
L2
L3
E
E
L1
L2
E
E
L
N
E
E
L1
L2
L3
E
E
L1
L2
N
E E
IEC U
L-N
/ U
L-L
: 480 V
LN
/ 830 V
LL
Three-phase 4-conductor systems
with non-grounded neutral conductor (IT networks)
L1
L2
L3
E
E
N
E
L1
L2
L3
E
N
R
L1
L2
L3
E
E
L1
L2
E
E
L
N
E
E
L1
L2
L3
E
E
L1
L2
N
E E
Suitable.
Three-phase three-conductor systems
ungrounded
L1
L2
L3
E
E
N
E
L1
L2
L3
E
N
R
L1
L2
L3
E
E
L1
L2
E
E
L
N
E
E
L1
L2
L3
E
E
L1
L2
N
E E
Suitable.
Three-phase three-conductor systems
with grounded phase
L1
L2
L3
E
E
N
E
L1
L2
L3
E
N
R
L1
L2
L3
E
E
L1
L2
E
E
L
N
E
E
L1
L2
L3
E
E
L1
L2
N
E E
U
L-L
830 V
LL
Range of application of the meter:
·3 and 4-conductor networks (TN, TT and IT
networks).
·Residential and industrial areas.
WARNING
Risk of injury due to electrical voltage!
Rated surge voltages above the permitted
overvoltage category can damage the insulation
in the device. This impairs the safety of the device.
This can result in serious injury or death.
·
Only use the device in environments which
comply with the permissible rated surge
voltage.
·
Observe the limits specified in the user
manual and on the rating plate.
INFORMATION
Functional earth
·
Connection D
in TN, TT and IT networks must
always be connected.
·
Connection A
only connect in TN and TT
networks (
not in IT networks
).