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12
Manual testing according to VDE 0701-0702
12.1
Overview of standard-related specifications
Protection class I
(Class I)
Protection
class II
(Class II)
Protection
class III
(Class III)
5.1*
)
Scope of testing:
*) The figures stated refer to VDE 0701-0702:2008-06.
5.2 Visual inspection
Check for visible defects and
suitability regarding the field of
application:
Connecting cables / plug
connections
Housing, strain relief,
protection against bending and
kinking...
X
X
X
5.3 Testing the protective
conductor
Continuity between the
earthing contact of the mains
plug and accessible conductive
parts of the device or of the
device connection
For cables with a rated current of
≤ 16.0 A:
up to
5 m
:
≤ 0.3 Ω
for each additional 7.5 m:
0.1
Ω
max.:
1.0
Ω
For cables with higher rated currents, the calculated ohmic
resistance value shall apply.
- - -
- - -
5.4 Measuring the insulating
resistance
3
Generally:
≥ 1.0 MΩ
for proving safe isolation
≥ 2.0 MΩ
for devices with heating elements
≥ 0.3 MΩ
for devices with heating elements and a power of
> 3.5 kW
1
≥ 0.3 MΩ
If for devices with heating elements and a power of
P > 3.5 kW
the value falls below the limit, the device still shall be considered
to be in proper condition as long as the limit of the protective
conductor current is not exceeded.
≥ 2 MΩ
≥ 0.25 MΩ
5.5 Measuring the protective
conductor current
2, 3
≤ 3.5 mA
4
at conductive components with PE connection
1 mA/ kW
to
max. 10 mA
for devices with heating elements
and a total power of more than
3.5 kW
- - -
- - -
5.6 Measuring the contact
current
3
≤ 0.5 mA
at conductive components without PE connection
≤ 0.5 mA
at conductive
components
- - -
5.7 Proving safe isolation (SELV,
PELV)
3
For devices generating a
SELV
or
PELV
voltage by means of a
safety isolating transformer or a
switch-mode power supply
Verifying the rated voltage: (compliance with specifications (SELV/PELV))
Output voltage measurement (e. g. for chargers, mains supply units): max.
25 V AC
or
60 V DC
for accessible active parts
Insulating resistance measurement (primary / secondary)
Insulating resistance measurement (between accessible conductive parts and active parts of
the SELV/ PELV circuit)
5.8/ Functional test
5.10
Functioning of protective equipment and functional test
Analysis, evaluation,
documentation
X
Additional notes concerning the table according to VDE 0701-0702:
1
If for devices of
protection class I
with heating elements and a total power of >
3.5 kW
the required insulating resistance is not
reached, the device still shall be considered to be in proper condition as long as the protective conductor current does not exceed the
limit of
5.5
.
2
If for the stated insulating resistance measurements for
protection class I
or
II
not all parts are measured completely (e. g. if relays or semiconductor components impede the transmission of electricity) or
if the measurements have been terminated with a negative result for devices with heating elements and a power of
> 3.5 kW
,
the alternative leakage current measuring method must not be applied!
In this case, it is necessary to use the direct or differential current measuring method.
3
Additional tests for devices with a secondary output voltage, e. g. isolating transformers, chargers, converters, power supply units:
1. insulating resistance measurement between secondary and primary side
2. insulating resistance measurement between secondary side and the equipment body
3. contact current measurements of the secondary voltage outputs (except for
Class III
)
4. measurement of the open-circuit voltage / output voltage.
4
When exceeding the limit (protective conductor current), it has to be checked whether other limits have to be observed due to product
standards or manufacturer specifications.
