Inspection and Testing 115
L
Temporary link
E
cpc
Reading at last outlet gives (R1 R2) value for the circuit
FIGURE 7.3
CPC continuity.
that are likely to exist. In these cases, continuity tests may have to be carried out at the installation stage before accessories are connected or terminations made off as well as after completion.
Continuity of ring final circuit conductors The two main reasons for conducting this test are: 1. to establish that interconnections in the ring do not exist 2. to ensure that the cpc is continuous and to indicate the value of (R1 R2) for the ring. What then are interconnections in a ring circuit and why is it important to locate them? Figure 7.4 shows a ring final circuit with an interconnection. The most likely cause of this situation is where a DIY enthusiast has added sockets P, Q, R and S to an existing ring A, B, C, D, E and F.