because the enclosure has isolated from earth potential, the appliance shall be
supplied from isolating transformer .
In case measuring instruments and auxiliary appliances protection Class (cathode ray
oscilloscope, sine wave generator), where the protective conductor interrupted facilitate
testing, e.3. Test equipment and test
areas shall clearly and visibly indicated means warning signs. adequate number manual controls
shall provided inside and outside the test area appropriate the size the area and
complexity layout.g. Protection against electric shock
The test assembly shall arranged and designed that the protection against direct contact
is secured insulation live parts, covers, enclosures, obstacles safe distances.g.
The test equipment controls and test circuits shall clearly identified.
.g.ERECTION AND OPERATION ELECTRICAL TEST EQUIPMENT 95
11.3. Safety can also means two-hand control device the use
of two safety probes apply the test voltage.
The test assembly shall designed and arranged order prevent the transfer of
voltage extraneous conductive parts. Connection points, e.
If circuit and/or the enclosure measuring instrument auxiliary appliance designed
for mains connection connected live parts the test assembly which can carry voltage to
earth, then the internal insulation the supplying isolating transformer shall rated least to
this voltage.
An effective protective measure for protection case fault (protection against indirect
contact) shall provided.
11. Where several persons are involved test, two-
hand control device shall provided for each person the personnel and which are so
connected that all the two hand controls are required operated before the test supplies can
be energised. outlets the general power supply within the test
area, shall identified accordingly, they are not interrupted the emergency switching off
equipment.
Safety test probes shall have the adequate insulation level for the applied test voltage. Test equipment shall
have devices which indicate the operational status, e. indicator lights.1 Emergency switching off
Test equipment shall provided with means for emergency switching off order cut
off all electrical energy which could result danger. safe
distance ensured, when the person carrying out tests cannot reach the prohibition zone with
parts his/her body tools. No
clamping devices shall permitted for this purpose
