2. The protective conductor reading will 1. Therefore, this case, a
satisfactory test result would obtained the resistance the protective conductor was
about 0.
2 Testing for continuity ring final circuit conductors
612.6Ω.05Ω) the
ring continuous.67
Step test: measuring the resistance phase,
neutral and protective conductors. There are three steps this test.2
Test Ohmmeter
connected to
Ohmmeter readings This gives value
for
Step and r1
N1 and N2
E1 and r2
Step Live and neutral
at each socket
Step Live and earth at
each socket
R1 R2
As check (R1 R2) value should equal r2/4
L1 N2
Ohm-
meter
L2
L1
N2
N1
E2
E1
Ohm-
meter
FIGURE 14.13 Table Which May Used Record the Readings Taken
When Carrying Out the Continuity Ring Final Circuit Conductors Tests
According IEE Regulation 612.68. Each reading should have value approximately
Table 14. Record the results a
table such that shown Table 14.Basic Electrical Installation Work
354
The protective conductor resistance values calculated this method can only an
approximation since the length the CPC can only estimated. ohmmeter reading should then taken between live
and neutral every socket outlet the ring circuit. within 0.2
The object the test ensure that all ring circuit cables are continu-
ous around the ring, that is, that there are breaks and interconnec-
tions the ring and that all connections are electrically and mechanically
sound.5/1.67.
.2.e. 14.
The test made with the supply disconnected, using ohmmeter as
follows:
Disconnect and separate the conductors both legs the ring the
main fuse.67 times as
great these readings 2.
Step 2
The live and neutral conductors should now temporarily joined together as
shown Fig. End-to-end live and neutral con-
ductor readings should approximately the same (i. This test also verifies the polarity each socket outlet.
Step 1
Measure the resistance the phase conductors (L1 and L2), the neutral
conductors (N1 and N2) and the protective conductors (E1 and E2) the
mains position shown Fig.13.5mm cable used. more precise result indicated the earth fault loop impedance test which is
carried out later the sequence tests. 14. The readings obtained
should substantially the same, provided that there are breaks mul-
tiple loops the ring
