Connect Devices; Protection Against Hazardous Touch Voltages - WAGO 750-495/040-00 Series Manual

WAGO-I/O-SYSTEM 750 XTR
750-495/040-00x 3-Phase Power Measurement Module 690 V
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7

Connect Devices

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7.1

Protection against Hazardous Touch Voltages

Provide touch-proof protection
Provide all the wiring of the measurement setup with touch-proof protection and
corresponding warning signs.
Take additional protective measures for voltages on the N connection that
are dangerous if touched
Voltages up to the nominal input voltage of the I/O module (U
measured directly if it is ensured that no voltage to ground that is dangerous if
touched can exist on the N connection of the I/O module during normal
operation.
If this is not ensured, additional protective measures must be taken (e.g., use of
voltage transformers with basic insulation).
It is essential to use voltage transformers (VTs) with reinforced insulation to
measure voltages above the nominal input voltage of the I/O module (U
The voltage transformer ratio must be selected in such a way that the secondary
voltages of the transformers do not exceed the nominal input voltage of the I/O
module.
Furthermore, the N connection on the module side must be grounded.
Otherwise, touch-proof protection from the system may no longer be given in the
event of a fault. This can cause electric shock or burns.
The 3 voltage measuring paths are not electrically isolated from the
4 current measuring paths
The N connection represents the device-internal reference potential for all
electrical measurements.
Additional unintended potential differences between the N connection and the
current connections can lead to incorrect measured values and the destruction of
the I/O module.
The current connections must not be grounded.
Observe limit values
Ensure that all limit values indicated in the technical data are observed (both
upper and lower limits)! Otherwise, the device could be destroyed.
Connect Devices 91
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Manual
Version 1.2.0