TESTBOY TV 450
Insulation resistance
30
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 M
Ω
÷ 200 M
Ω
]
Test circuits for insulation resistance
L1
L2
L3
N
PE
mains voltage
switched off
closed
switches
loads disconnected
N/L
2
L
/L
1
PE
/L
3
Figure 5.6: Connections for insulation measurement
