Protective Earth Continuity Test (1) - Nespresso Essenza C91 Service Manual

Function Tests
Protective earth continuity test (1)
What coffee machine model has to be test­
ed and when?
This test is necessary
­ for class 1 equipment (three­wire power
cord with protective earth)
­ after a repair whenever the housing was
opened and for example a general disas­
sembly was performed.
Therefore all coffee machine models have to
be tested after opening the housing, except
country­specific models without a protective
earth connection.
General
Legal regulation
In case of a repair/modification of the coffee
machine, the repair centre is bound by law to
protect the user/consumer by
­ restoring the regular condition of the appli­
ance and
­ performing the respective tests according
to EN/IEC 60335­1 "Safety of household
and similar electrical appliances" and
national regulations (e.g. DIN VDE 0701).
Service Manual C91 / D91
Description
Protective earth continuity measurements are
made between the protective earth terminal of
the power plug and
­ the thermoblock,
­ all conductive, touchable parts of the coffee
machine where dangerous voltage could
occur if the basic insulation was to fail.
This test assures that
­ the ground (earth) connection does not
have an interruption between the power
plug and the thermoblock
­ the permissible ground resistance is less
than 0.3 Ohms (with a test current of
200 mA DC).
Test equipment
Special test equipment is needed that
complies with the regulations to perform
protective earth continuity measurements.
Detailed requirements and tolerances must be
verified by your local authorities or measure­
ment supplier in any case.
Ask Nespresso for recommenda­
tions about test equipment.
28
Test report
For legal reasons a repair or test report should
be prepared and filed with following informa­
tion
­ customer (name, address)
­ type and serial number of coffee machine
­ date of repair/test(s)
­ performed test(s)/measuring value(s)
­ used test equipment
­ signature
Test sequence
Danger of electrocution!
Do not plug in the coffee machine
during the protective earth conti­
nuity test.
Read and observe safety instruc­
tions in user manual of test equip­
ment.
This test sequence is not applicable
for coffee machines with two­wire
power cords (without ground pin).
Continued on next page.
Version 1.0 en