Deck 1: The Legal Requirements

Question 1

An Electrical installation certificate requires a tick against three types of work, they are

A) Minor works, Periodic inspection, Alterations
B) Periodic testing, additions, visual inspection
C) New installations, Alterations, Additions to existing installations
D) Cable colour change, New switches, low energy lamps

Answer 1

C

Question 2

An Electrical installation certificate requires the due date of the first periodic inspection and test to be recorded by

A) The installer
B) The person carrying out the test
C) The designer
D) The customer

Answer 2

C

Question 3

Which of the following is a non statutory document

A) EWAR 1989
B) BS 7671
C) ESQCR 2002
D) HASAWA 1974

Answer 3

B

Question 4

Which sense human sense would be best suited to identifying an incomplete enclosure

A) Smell
B) Hearing
C) Touch
D) Sight

Question 5

High levels of safety must be present when using test leads and probes, which of the following would be suitable

A) Accurate test equipment
B) Finger guards
C) Probes exceeding 4mm
D) Very short leads

Question 6

Which instrument would be used to carry out a test for the continuity of protective bonding conductors

A) A low resistance ohmmeter
B) A continuity tester
C) A high ohmmeter
D) An insulation resistance tester

Question 7

When carrying out a test for protective bonding continuity the test instrument should have a range of

A) 0.2 to 2MΩ
B) 0.01 to 100Ω
C) 2.0 to 20Ω
D) 0.2 to 2.0Ω

Question 8

When carrying out a test on main protective bonding it is important that

A) One end is disconnected
B) The installation is not isolated
C) It is connected at both ends
D) The correct colour test leads are used

Question 9

When carrying out a ring circuit test the end to end resistance for each live conductor is 0.6O and the cpc end to end resistance is 1.0O. The expected value between L and E at each socket after cross connection would be

A) 1.6Ω
B) 0.3Ω
C) 0.4Ω
D) 1.2Ω

Question 10

The minimum permissible insulation resistance value between live conductors and earth on a low voltage lighting circuit is

A) 1.0Ω
B) 1.0mΩ
C) 1.0 MΩ
D) 0.5MΩ

Question 11

State the minimum acceptable insulation resistance test voltage for a circuit supplying equipment at 600v

A) 1000v d.c.
B) 500v d.c.
C) 600v d.c.
D) 250v d.c.

Question 12

Name three special locations identified in BS 7671

A) Caravan park, ice skating rink, room containing a bath or shower
B) Restrictive conductive location, Marina, Construction site
C) Sauna, areas with protective conductor currents, Swimming pool
D) Street lighting, mines and quarries, underground car parks

Question 13

The IP rating specific to finger protection is

A) IPXXB
B) IP2X
C) IPXXD
D) IPX2

Question 14

The minimum IP rating for the cover plate on the top of a motor is

A) IP56
B) IPX2
C) IPX4
D) IP4X

Question 15

The external loop impedance for an installation should be measured at

A) The end of a final circuit
B) The nearest socket outlet
C) The origin of the supply
D) At each socket outlet

Question 16

The maximum Ze expected for a TN-C-S system would be

A) 0.8Ω
B) 0.035Ω
C) 21Ω
D) 0.35Ω

Question 17

Ze should always be measured with the earthing conductor

A) Disconnected from the consumers unit
B) Coiled up
C) Bypassed
D) Connected to the consumers unit

Question 18

A metallic earth return path would be found in a

A) TT system
B) TN-S system
C) TN-C-S system
D) TN-C system

Question 19

The symbol I∆n is used to indicate the

A) Maximum RCD operating current
B) The tripping time of an RCD
C) The type of RCD
D) The current at which the RCD should trip

Question 20

The trip rating of an RCD used for additional protection should be

A) 0.03mA
B) 0.30mA
C) 100mA
D) 0.03A