Electrical Installation Safety Trainer
AD 1 - MI 3399
108
As seen from the results above the measurement in a TN system (left) is below the
threshold and the test passed. The test in a TT system (right) is marked as failed. Since
this test actually measured earth resistance the test result should be considered as
passed regardless of what the device is telling us. The device does not distinguish
between TN and TT earthing systems so it cannot predict the type of earthing system
used. It is up to the user set the limit for the R
PE
test in order for the device to correctly
interpret the results.
Expected results with a simulated error
A typical fault when measuring continuity would be if the resistance of PE conductor
would be above 2
Ω. To simulate such an error enable the switch
S19
in the Application
Trainer.
Figure 2-46: Simulated continuity error
E
xer
ci
ses
S
w
itch
Function
Site of error
ON
OFF
S15 R LOW / IMD
IT F3/1
PE outlet
> 20
Ω
< 1
Ω
S16 ISFL / IMD
IT F3/2
ISFL
approx. 6 mA (@ 230 V)
approx. 3 mA (@ 115 V)
< 1.3 mA
S17 R LOW
IT PE ref.
approx. 3.3 Ω
< 1 Ω
S18 R LOW
TN/TT F1/4
PE light
> 20
Ω
< 1 Ω
S19 R LOW / Z LOOP
TN/TT F1/2
PE outlet (3-ph.)
approx. 3.4 Ω
< 1 Ω
S20 R LOW / Z LOOP
TN/TT F2/2
PE outlet
> 2.3
Ω
< 2 Ω
S21 R LOW
MPE / PE Gas
approx. 2.2 Ω
< 1 Ω
S22 R LOW
MPE / PE Heat inst.
approx. 3.3 Ω
< 1 Ω
P
E
C
o
n
n
e
c
tio
n
Summary of Contents for MI 3399
Page 27: ...Electrical Installation Safety Trainer AD 1 MI 3399 27...
Page 46: ...Electrical Installation Safety Trainer AD 1 MI 3399 46 3 Exit settings...
Page 74: ...Electrical Installation Safety Trainer AD 1 MI 3399 74...
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