HT instruments SIRIUS89N - Manual (Page 22)

SIRIUS89N
EN - 20
Standard Brief description Test voltage Maximum limit value
CEI 64-8/6
Systems SELV or PELV
Systems up to 500V (Civil installations)
Systems over 500V
250VDC
500VDC
1000VDC
> 0.250M Ω
> 0.500M Ω
> 1.0M Ω
CEI 64-8/4
Floor and wall insulation in civil installations
Floor and wall insulation in systems over 500V
500VDC
1000VDC
> 50k Ω (se V<500V)
> 100k Ω (se V>500V)
EN60439 Electrical panel boards 230/400V 500VDC > 230k Ω
EN60204 Electrical equipment of machines 500VDC > 1M Ω
Table1: Table reporting the test voltage and the corresponding limit values for
few Guidelines.
Rated voltage selected
for the test
R
MAX
= Maximum resistance
value
50VDC 99.9M
Ω
100VDC 199.9M
Ω
250VDC 499M
Ω
500VDC 999M
Ω
1000VDC 1999M
Ω
Table2: Table of maximum resistance values which can be measured under M Ω
mode depending on the rated voltage selected.
6. If the
"TMR" mode was selected use the F3, F4 keys to set the duration time of
the test:
CAUTION
Never disconnect the test leads from the circuit under test when the
message
"MEASURING" is displayed as the circuit under test may remain
charged at a dangerous voltage. The instrument has an internal "safety
resistor" which is connect to output terminal before end of test in order to
discharge the parasite capacities of the installation
7. Press the
START key.
The instrument will start the test.
MAN Mode: The test will take 4 seconds (maximum). If you keep
the START key pressed longer than 4 seconds the test go on
until the key is released.
TMR mode: The test will take the time set. If you want to stop
the test when it's running, press the START STOP key again.
START
STOP