1
During an initial verification three conditions must be verified, one of these conditions as
stated in BS7671 is:
(A)
All working correctly
(B)
All circuits have been inspected
(C)
All electrical equipment has been installed in compliance with section 511
(D)
Correctly selected and erected in accordance with the building regulations
2
A non statutory document which may be referred to during the inspection of an electrical
installation is:
(A)
(B)
(C)
(D)
3
A statutory document which may be referred to during initial verification is
(A)
BS 7671
(B)
GN 3
(C)
GS 38
(D)
EAWR 1989
4
The purpose of an initial verification as described in GN3 is
(A)
To confirm by inspection and test that the installation complies with the design and
construction aspects of BS 7671
(B)
To confirm by inspection and test that the installation complies with the design and
construction aspects of EAWR 1989
(C)
That it works correctly and is compliant with GN3
(D)
To confirm that it is complete and works correctly
5
A test value which may be obtained by the use of an RCD tester would be
(A)
30mA
(B)
30m/Ω
(C)
30s
(D)
30m/s
6
In sequence the first three tests carried out on a ring circuit would be
(A)
L-L, N-N, E-E
(B)
Ring final circuit test, insulation resistance test, earth fault loop impedance
(C)
Ring final circuit test, polarity, insulation resistance test
(D)
All conductors end to end, L-N cross connected, L-E cross connected
(B)
Ring final circuit test, insulation resistance test, earth fault loop impedance
7
An insulation resistance test carried out on five circuits of an electrical installation provided
the following results, 50MO, 39MO, 56MO, 83MO and 26MO. Calculate the expected
resistance if all of the circuits were to be measured together in parallel
(A)
19MΩ
(B)
87MΩ
(C)
8.77MΩ
(D)
8.77mΩ
(C)
8.77MΩ
8
A special location which may be connected to a TN-C-S system is
(A)
Construction site
(B)
Swimming pool
(C)
Caravan site
(D)
Sauna
(D)
Sauna
9
The insulation resistance test voltage which may be applied to a circuit containing surge
protection is
(A)
230v d.c
(B)
500v d.c
(C)
250v d.c.
(D)
1000v d.c.
(C)
250v d.c.
10
The number of tests required when carrying out a resistance test on an earth electrode
which is to be used with a generator is
(A)
3
(B)
4
(C)
6
(D)
(D)
1
11
State one situation within a domestic installation which would require the installation of an
RCD
(A)
Existing circuits in a bathroom
(B)
Additional socket outlet installed in a bedroom
(C)
Fused spur installed using mini trunking
(D)
Existing circuits protected by BS 3036 semi enclosed fuses
(B)
Additional socket outlet installed in a bedroom
12
An earth electrode test is to be carried out using an earth electrode tester, if the electrode
under test is to be inserted to a depth of 2.5m the minimum recommended distance for the
test probe C2 is
(A)
25m
(B)
12.5m
(C)
2.5m
(D)
2500mm
(A)
13
The On Site Guide states that T.T TN-S and TN-C-S systems have the following max Ze
values
(A)
T.T. 0.8Ω. TN–S 21Ω. and TN-C-S 0.35Ω.
(B)
TN-C-S 0.8Ω T.T. 21Ω. and TN–S 0.35Ω.
(C)
T.T. 0.35Ω. TN-C-S 21Ω. TN-S 0.8Ω
(D)
T.T 21Ω. TN–S 0.8Ω. TN-C-S 0.35Ω
(D)
14
Where BS 7671 show a protective device as having a maximum Zs value of 2.3O the
maximum corrected value will be
(A)
2.3Ω
(B)
1.84Ω
(C)
1.72Ω
(D)
2.87Ω
(B)
1.84Ω
15
A BS EN 61008-1 RCD is to be installed on a farm to provide fire protection, The maximum
I∆n rating for the device would be
(A)
3
(A)
500mA
(B)
100 mA
(C)
300 mA
(D)
30mA
16
The maximum disconnection time permissible for a BS EN 61008-1 RCD used for fire
protection is
(A)
0.2 s
(B)
300ms
(C)
200ms
(D)
40ms
(B)
17
The maximum permitted disconnection time for a 20A radial circuit connected to a TN-S
system is
(A)
0.4 sec
(B)
5 sec
(C)
0.2 sec
(D)
40ms
(A)
0.4 sec
18
A circuit is which is 30 m long ins wired in copper conductors each of which have a
resistance value of 7.41mΩ/m at 20 deg C. Calculate the expected voltage drop for this
circuit if a load of 16 A is connected to it
(A)
3.56 volts
(B)
7.11 volts
(C)
4.2 volts
(D)
8.54 volts
(D)
8.54 volts
19
Voltage drop can be verified using either of two methods, these are
(A)
Enquiry and measurement of circuit impedance
(B)
Measurement of circuit impedance and calculation
(C)
Calculation and testing
(D)
Use of tables and enquiry
(B)
Measurement of circuit impedance and calculation
(C)
300 mA
20
To comply with recommendations provided by the HSE safe isolation should be carried out
using
(A)
A proving unit
(B)
An approved voltage indicator
(C)
A volt stick
(D)
A multi meter