Manual

GSC53N - GSC57 - ZG47
EN - 128
PURPOSE OF THE TEST
Check that the insulation resistance of the installation complies with the requirements
of IEE 16
th
edition standard.
NOTA: This test is to be effected on an open circuit with any load disconnected.
INSTALLATION PARTS TO BE CHECKED
a) Between each active conductor and the earth (the neutral conductor is considered
an active conductor except in the case of TN-C systems where it is considered
part of the earth (PEN).
During this measurement all active conductors can be connected to each other, in
case the measurement result does not fall within the standard limits the test is to be
repeated for each single conductor.
b) Among active conductors.
The IEE 16
th
edition standard recommends to check the insulation among the
active conductors when this is possible (ATTENTION).
A procedure indicating how to effect the insulation resistance measurement on an
installation is reported in the following table:
Procedure for insulation resistance measurement referred to the previous picture:
Switch situation
Point under test
Measurement result
Judgement on the
installation
1
Turn the switch A,
l D and E off
Effect the
measurement on switch
A
Se R R
LIMITE
OK (end of the test)
Se R R
LIMITE
Proceed 2
2
Turn the switch B
off
Effect the
measurement on switch
A
Se R R
LIMITE
Proceed 3
Se R R
LIMITE
INSTALLATION
NOT COMPLYING
WITH STANDARDS
3
Effect the
measurement on switch
B
Se R R
LIMITE
OK (end of the test)
Se R R
LIMITE
Proceed 4
4
Turn the switch C
off
Effect the
measurement on switch
B
Se R R
LIMITE
Proceed 5
Se R R
LIMITE
INSTALLATION
NOT COMPLYING
WITH STANDARDS
5
Effect the
measurement on switch
C
Se R R
LIMITE
OK (end of the test)
Se R R
LIMITE
INSTALLATION
NOT COMPLYING
WITH STANDARDS
Table7: table with procedure steps for insulation measurement referred to the installation
reported in Insulation measurements on an installation.
Note The switches D and E are those installed near the load having the purpose of
separating it from the installation. In case the above said RCDs do not exist it is
necessary to disconnect the users from the installation before effecting the insulation
resistance test.
WARNING
If the installation includes electronic devices, disconnect them from the
installation and in case this is impossible only the test "a" is to be effected,
that is to say between active conductors (which in this case SHALL be
connected together) and the earth.