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