3). these cases each circuit
should separately tested obtain reading greater than 2MΩ.Basic Electrical Installation Work
356
should disconnected, since they will respectively glow, charge be
damaged the test.
Although insulation resistance reading 1. These are line and neutral conductors earth and between line
conductors.
4 Testing polarity (612.
The insulation resistance readings for each test must not less than
1. Test between line and neutral conductors every distribution circuit
at the consumer’s unit shown Fig.
3. 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.e.c. important make polarity
test the installation since visual inspection will only indicate conduc-
tor identification.
4. Remove all lamps. Close all switches and circuit breakers. live and neutral conductors connected together) and the earthing
arrangements may made.
4. Disconnect appliances.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.3.0MΩ (IEE Regulation 612.
2. 14.6)
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.
There are two tests carried out using insulation resistance tester
which must have test voltage 500 d. Record the results a
schedule test results such that given Appendix the IEE
Regulations.0MΩ for satisfactory result (IEE Regulation 612. Remove all lamps.2). Disconnect appliances.70
Insulation resistance test. The insulation resistance these tests should
be not less than 1.
2.70(b) and record the result.3. for 230 and 400 installa-
tions. Close all switches and circuit breakers.
3.
Between line conductors
1.
To final circuits
L N
Tester
(a)
FIGURE 14.
Where the circuit includes electronic equipment which might damaged
by the insulation resistance test, measurement between all live conduc-
tors (i. The procedures are:
Phase and neutral conductors earth
1.
To final circuits
L N
Tester
(b)
.70(a). 14
