MI 3101 EurotestAT: Measurements
Insulation
45
5 Measurements
5.1 Insulation resistance
Insulation resistance measurement is performed in order to assure 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
4.2 Single test
for functionality of keys.
Figure 5.1: Insulation resistance
Test parameters for insulation resistance measurement
TEST
Test configuration
[L-N, L-PE, N-PE, ‘L-PE,N-PE’, ‘L-N,L-PE’, ALL]
Uiso
Test voltage
[50 V, 100 V, 250 V, 500 V, 1000 V]
Limit
Minimum insulation resistance
[OFF, 0.1 M
÷ 200 M
, (‘L-PE,N-PE’,
‘L-N,L-PE’,
ALL
: 20 M
)]
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 5.2: Connection of universal test cable for general insulation resistance
measurement (TEST: L-PE)
