Amprobe DMIII-Multitest Power-Quality-Recorder - Manual (Page 85)

AMPROBE
DMIII MULTITEST
EN-83
Check the continuity among:
a) Earth poles of all the plugs and earth collector or node.
b) Earth terminals of class I instruments (Boiler etc.) and earth collector or node.
c) Main external masses (water, gas pipes etc.) and earth collector or node.
d) Auxiliary external masses to the earth terminal.
ALLOWABLE VALUES
The standards CEI 64-8/6 do not give any indication on the maximum resistance values
that cannot be overcome, in order to be able to declare the positive outcome of the
continuity test.
The standard CEI 64-8/6 simply requires that the instrument in use warn the operator if
the test was not carried out with a current of at least 0.2 A and an open circuit
voltage ranging from 4 V to 24 V.
The resistance values can be calculated according to the sections and lengths of the
conductors under test, anyway if the instrument detects values of some ohm the test
can be considered as passed.
16.2. Check of the Circuit Separation
PURPOSE OF THE TEST
The test, to be effected in case the protection is realized through separation (64-8/6
612.4, SELV or PELV or electrical separation), shall check that the insulation resistance
measured according to the indications below (depending on the separation type)
complies with the limits reported in the table relative to the insulation measurements.
 INSTALLATIONPARTS TO BE CHECKED

SELV system (Safety Extra Low Voltage):
 Measure the resistance between the active parts of the circuit under test
(separate) and the active parts of the other circuits.
 Measure the resistance between the active parts of the circuit under test
(separate) and the ground.
The resistance shall not be lower than 0.25M

with a test voltage of 250VDC.

PELV system (Protective Extra Low Voltage):
 Measure the resistance between the active parts of the circuit under test
(separate) and the active parts of the other circuits.
The resistance shall not be lower than 0.25M

with a test voltage of 250VDC.

Electrical separation:
 Measure the resistance between the active parts of the circuit under test
(separate) and the active parts of the other circuits.
 Measure the resistance between the active parts of the circuit under test
(separate) and the ground.
The resistance shall not be lower than 0.5M

with a test voltage of 500VDC and
1M

with a test voltage of 1000VDC.
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