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TV 450/455 Insulation resistance
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5.2 Insulation resistance
The Insulation resistance measurement is performed in order to ensure safety against
electric shock through insulation. It is covered by the EN 61557-2 standard. Typical
applications are:
Insulation resistance between conductors of installation,
Insulation resistance of non-conductive rooms (walls and floors),
Insulation resistance of ground cables,
Resistance of semi-conductive (antistatic) floors.
See chapter 4.1 Function selection for instructions on
key functionality.
Figure 5.5: Insulation resistance
Test parameters for insulation resistance measurement
Uiso Test voltage [50 V, 100 V, 250 V, 500 V, 1000 V]
Limit
Minimum insulation resistance [OFF, 0.01 MΩ ÷ 200 MΩ]
Test circuits for insulation resistance
L1
L2
L3
N
PE
mains voltage
switched off
closed
switches
loads disconnected
N/L2
L
/
L
1
PE/L3
Figure 5.6: Connections for insulation measurement
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