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Installation
© Gyr
D000029326 en g – E450 PLC 1-phase ZCX100Px – User Manual
4.4
Connecting
i
Observe safety instructions
Prior to start connecting of the meter read and strictly observe the general
safety instructions given in
section 4.2
"Before Installation"
. The meter must
be mounted as described in
section 4.3 "Mounting"
before it is connected.
4.4.1
Connecting the Phase and Neutral Connection Wires
1.
Cut the phase and neutral connecting wires to the required length and
strip their ends.
The insulation of the connecting line must extend as far as the terminal
indentation, i.e. there must be no further bare part of the connecting
line visible above the terminal edge. The stripped part of the connect-
ing wire should be shortened if necessary.
2.
If stranded wire is used as a phase and neutral connection line, it has
to be provided with a ferrule for connection.
Wire
Wire insulation
ends before
terminal
Connector screws
Terminal
Terminal block
Fig. 4.4 Phase connection terminal
3.
Insert the phase and neutral connecting wires in the relevant terminals
(the terminals are numbered as shown in the connection diagram) and
tighten the terminal screws firmly (torque max. 3 Nm).
•
For wires with small conductor cross-sections (
≤
6 mm
2
) the con-
necting line must be placed carefully in the middle of the terminal,
so that it cannot move sideways when tightening the terminal
screws. When tightening, ensure that the connecting line remains
between the copper inside the terminal and the screw.
•
It is recommended that the beginning and end of the relevant con-
ductors are identified using a suitable test unit (e.g. buzzer) to en-
sure that the right consumer is connected to the meter output.
i
Insufficiently tightened screws cause power loss
Failure to tighten terminal screws sufficiently can lead to power loss and heat-
ing. Note: A contact resistance of 1 m
Ω
causes a power loss of 10 W at 100 A.
Do not withdraw connecting wires with closed terminals
Never withdraw connecting wires with the terminal closed, as this can dam-
age the terminal.
