For this type sup-
ply necessary sink earth electrode into the general mass earth,
which then forms part the earth return conjunction with RCD. the pin the right earth) and earth
at each socket outlet shown Fig.71.7)
Low-voltage supplies having earthing arrangements which are indepen-
dent the supply cable are classified systems.
Remove the test link and record the results schedule test results such
as that given Appendix the IEE Regulations.
. Test between the centre pin any Edison screw lampholders and
any convenient earth connection. Fix temporary link between the line and earth connections the
consumer’s side the main switch.
4.71
Polarity test. 14. Test between the ‘common’ terminal and earth each switch
position. Remove all lamps and appliances.Electrical installations and wiring systems
357
The test done with the supply disconnected using ohmmeter con-
tinuity tester follows:
1.
2. Switch off the supply the main switch. Test between the live pin (i.
Lights
Switches
Sockets
Link
L N
Tester
C
C
C
FIGURE 14.
For satisfactory test result the ohmmeter continuity meter should read
very close zero for each test.e.
3.
5.
6.
5 Testing earth electrode resistance (612
