c. Remove all lamps.
3.0MΩ complies with the
Regulations, the IEE Guidance Notes tell that much higher values than
this can expected and that reading less than 2MΩ might indicate a
latent but not yet visible fault the installation. 14.
Between line conductors
1. for 230 and 400 installa-
tions.6)
The object this test verify that all fuses, circuit breakers and switches
are connected the line live conductor only, and that all socket outlets
are correctly wired and Edison screw-type lampholders have the centre
contact connected the live conductor.
Although insulation resistance reading 1. Disconnect appliances.
Where the circuit includes electronic equipment which might damaged
by the insulation resistance test, measurement between all live conduc-
tors (i.
2. Record the results a
schedule test results such that given Appendix the IEE
Regulations. Test separately between the line conductor and earth, and between
the neutral conductor and earth, for every distribution circuit the
consumer’s unit shown Fig. Test between line and neutral conductors every distribution circuit
at the consumer’s unit shown Fig.
To final circuits
L N
Tester
(b)
.70(b) and record the result. The procedures are:
Phase and neutral conductors earth
1.0MΩ (IEE Regulation 612.
4 Testing polarity (612.
2. The insulation resistance these tests should
be not less than 1.2). important make polarity
test the installation since visual inspection will only indicate conduc-
tor identification.3). Disconnect appliances.
3.
4.70(a).3. 14. Close all switches and circuit breakers.70
Insulation resistance test. These are line and neutral conductors earth and between line
conductors.e. Close all switches and circuit breakers.
4. Remove all lamps.
To final circuits
L N
Tester
(a)
FIGURE 14.Basic Electrical Installation Work
356
should disconnected, since they will respectively glow, charge be
damaged the test.
There are two tests carried out using insulation resistance tester
which must have test voltage 500 d.0MΩ for satisfactory result (IEE Regulation 612. these cases each circuit
should separately tested obtain reading greater than 2MΩ.
The insulation resistance readings for each test must not less than
1. live and neutral conductors connected together) and the earthing
arrangements may made.3
