Deck 3: Initial Verification Inspection

Question 1

During initial verification the three conditions which must be verified as stated in BS7671 are

A) Polarity, R1 + R2 and all materials compliant with BS
B) Environment, utilization and construction
C) Installed equipment is of the correct type and complies with appropriate BS. (not BS 7671),All of the fixed installation has been correctly selected and erected and it is not visibly damaged or defective
D) Installed equipment works correctly, all circuits are RCD protected and all equipment installed in zone 1 of a bathroom is to IP4X

Answer 1

C

Question 2

The title given in law to the person carrying out periodic inspections is

A) Duty holder
B) Competent person
C) Electrician
D) Qualified electrician

Answer 2

A

Question 3

The electricity at work regulations state that persons carrying out electrical work must

A) Wear glasses
B) Be supervised
C) Be insured
D) Be competent

Answer 3

D

Question 4

State one supply parameter which may be measured or obtained from the DNO

A) Frequency
B) Voltage
C) Ipf
D) I∆n

Question 5

State two supply parameters which can only be obtained by enquiry to the DNO

A) Ipf , PFC
B) Voltage, Frequency
C) Zs, Maximum demand
D) Voltage, PFC

Question 6

The purpose of initial verification as identified in guidance note 3 is to ensure that

A) All installed equipment works
B) The installation has been designed and constructed to comply with BS7671
C) That the installation has been correctly tested
D) The installation complies with the customers requirements

Question 7

The resistance of a single conductor is 0.7O. If the length is doubled and the c.s.a is doubled the effect on the resistance will be

A) It is doubled
B) It is halved
C) It remains the same
D) It increases

Question 8

When a test on a cable is carried out using a low resistance ohmmeter the value provided by the instrument will be in

A) kA
B) mΩ
C) MΩ
D) Ω

Question 9

The test voltage required for an insulation test carried out to prove electrical separation between a SELV circuit and a low voltage circuit is

A) 500v d.c.
B) 25v d.c.
C) 250v d.c.
D) 50v d.c.

Question 10

An insulation resistance test of an electrical installation formed of five circuits produces the following results 100MΩ, 80MΩ, 25MΩ, 70MΩ and 20MΩ. The insulation resistance value expected if the test was carried out at the meter tails would be

A) 0.126Ω
B) 7.88mΩ
C) 7.88MΩ
D) 0.126MΩ

Question 11

An insulation resistance test is to be carried out on a circuit which contains a socket outlet with surge protection, the maximum test voltage is

A) 500v d.c.
B) 230v d.c.
C) 250v d.c.
D) 50v d.c.

Question 12

Additional protection will be required for

A) Circuits which cannot meet the required disconnection time
B) A lighting circuit in a room containing a bath or a shower
C) Installations where there is no protective bonding
D) Circuits supplied by a TT system

Question 13

The earth fault return path for a TT system is

A) The general mass of earth
B) The earthing conductor and the general mass of earth
C) The protective bonding conductor, the mass of earth and the earthing conductor
D) The earthing conductor, the earth electrode and the general mass of earth

Question 14

The maximum tabulated Zs for a protective device as shown in BS 7671 is 1.44Ω, the maximum permissible measured Zs will be

A) 1.44Ω
B) 1.43Ω
C) 1.15Ω
D) 1.08Ω

Question 15

The prospective fault current for an installation is to be measured at the origin of a polyphase installation, the highest measured value is likely to be between

A) L1 - E
B) L1 - N
C) L3 - N
D) L1 - L2

Question 16

One point of a 3 phase installation where phase rotation must be checked

A) Each consumers unit
B) Each distribution board
C) The origin of the installation
D) The terminals of an electric motor

Question 17

The type of inspection during which voltage drop should be verified

A) Initial verification
B) Periodic inspection
C) Visual
D) Formal

Question 18

The type of instrument which can be used to check phase sequence is

A) An approved voltage indicato
B) An earth fault loop resistance tester
C) A rotating disc type
D) A multi meter

Question 19

One condition that must be checked when confirming polarity is

A) Correct IP ratings
B) Double pole switches are used to switch all line conductors
C) The thread of an ES lamp holder is not connected to the neutral
D) Correct connection of equipment

Question 20

Determine the voltage drop for a circuit with a combined L-N resistance of 0.43Ω at 20 deg C and a load current of 20A

A) 5v
B) 8.6v
C) 10.32v
D) 4.65v