e.7)
Low-voltage supplies having earthing arrangements which are indepen-
dent the supply cable are classified systems.
3. the pin the right earth) and earth
at each socket outlet shown Fig.
5. Test between the centre pin any Edison screw lampholders and
any convenient earth connection. For this type sup-
ply necessary sink earth electrode into the general mass earth,
which then forms part the earth return conjunction with RCD. Fix temporary link between the line and earth connections the
consumer’s side the main switch. Remove all lamps and appliances.
6.71
Polarity test. 14.Electrical installations and wiring systems
357
The test done with the supply disconnected using ohmmeter con-
tinuity tester follows:
1.
.
Lights
Switches
Sockets
Link
L N
Tester
C
C
C
FIGURE 14.
4.
5 Testing earth electrode resistance (612.
Remove the test link and record the results schedule test results such
as that given Appendix the IEE Regulations. Test between the live pin (i.
For satisfactory test result the ohmmeter continuity meter should read
very close zero for each test. Switch off the supply the main switch.
2. Test between the ‘common’ terminal and earth each switch
position.71
