This test also verifies the polarity each socket outlet.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. The protective conductor reading will 1. End-to-end live and neutral con-
ductor readings should approximately the same (i.
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. more precise result indicated the earth fault loop impedance test which is
carried out later the sequence tests.67 times as
great these readings 2.2.
.5mm cable used. Each reading should have value approximately
Table 14. There are three steps this test. ohmmeter reading should then taken between live
and neutral every socket outlet the ring circuit.2. 14.05Ω) the
ring continuous.
Step 2
The live and neutral conductors should now temporarily joined together as
shown Fig.
The test made with the supply disconnected, using ohmmeter as
follows:
Disconnect and separate the conductors both legs the ring the
main fuse. The readings obtained
should substantially the same, provided that there are breaks mul-
tiple loops the ring.68.6Ω. 14.2
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.
2 Testing for continuity ring final circuit conductors
612. within 0. Therefore, this case, a
satisfactory test result would obtained the resistance the protective conductor was
about 0.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.13.13 Table Which May Used Record the Readings Taken
When Carrying Out the Continuity Ring Final Circuit Conductors Tests
According IEE Regulation 612.e.67. Record the results a
table such that shown Table 14.5/1.67
Step test: measuring the resistance phase,
neutral and protective conductors
