2391-51 Extra questions for MC paper 1

When an inspector is setting inspection and testing samples, what is a major consideration?

Site access restrictions

Correct Incorrect Correct answer

Quality of records kept

Correct Incorrect Correct answer

Likely weather conditions

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Working hours (normal)

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What factor could have an impact on the limitations agreed with a client?

Loss of supply to an essential data system

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Number of distribution circuits present

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Ability to access rooms at a particular time

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Section of the building the client occupies

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A local Authority require a periodic inspection and testing of a private building, what would be the common reason for this to be done?

Insurance renewal

Correct Incorrect Correct answer

Change of ownership

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Mortgage application

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Licenced premises

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‘Working on or near live parts’ is covered under Regulation 14 of the Electricity at Work Regulation, what does it state under this regulation?

Those undertaking the work shall notify the HSE in advance

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Under no circumstance should this be undertaken

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Suitable precautions must be taken to prevent injury

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The building can be occupied during the works

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How should the means of isolation be secured where by four persons are inspecting a large installation?

Using four notices on the installation main switch

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Using four different colours of electrical tape over the main switch

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Using a device that will accept four locks having unique keys

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Using a device that accepts one lock have four keys

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When code a defect which of the following is an example of a C1 classification code?

Missing trunking lid containing non-sheathed cables

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A damaged light switch exposing internal parts

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A circuit supplying a bathroom with no additional protection provided

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A 20A circuit breaker protecting a 1.5mm2 cable

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The second number of an IP code relates to which type of protection?

Dust ingress

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Solid object ingress

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Finger ingress

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Water or moisture ingress

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Where the use of an RCD is provided for fault protection only, what would be the maximum setting of the residual current?

It will depend on the value of the earth fault loop impedance

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It will depend on the current rating of the protective device

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30mA as required for additional protection

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100mA when used as a main switch 1.48

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Under what circumstances would remove the need for a ring-final continuity test during periodic testing?

Where no records exist and the circuit has not been altered

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Where records exist and no alterations have been done

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Where old records exist and the circuit has been altered

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Where the circuit is protected by an RCD, but no records exist

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Questions 17 – 21 relate to the following scenario

There is a continuity test to be conducted on the main protective bonding conductor within a large industrial installation. The gas installation pipe work, water pipe work and steel framework of the building have all separately run conductors connected to the MET. Each conductor is concealed at various parts along their run. All connection to the extraneous conductive parts are remote from the MET.

The conductors are disconnected from the MET for which of the following reasons?

Ensure no sparks or arcs create a risk with gas

Correct Incorrect Correct answer

Ensure no dangerous potential difference occurs

Correct Incorrect Correct answer

Eliminate parallel paths through other earths

Correct Incorrect Correct answer

Ensure conductors are isolated from the supply

Correct Incorrect Correct answer

Questions 17 – 21 relate to the following scenario

There is a continuity test to be conducted on the main protective bonding conductor within a large industrial installation. The gas installation pipe work, water pipe work and steel framework of the building have all separately run conductors connected to the MET. Each conductor is concealed at various parts along their run. All connection to the extraneous conductive parts are remote from the MET.

Before the conductor can be disconnected from the MET, what needs to take place?

Voltage is checked between the MET and test earth electrode

Correct Incorrect Correct answer

Gas and water supplies must be isolates from their supply

Correct Incorrect Correct answer

The electrical installation is isolated from the supply

Correct Incorrect Correct answer

An insulation resistance check between each conductor

Correct Incorrect Correct answer

Questions 17 – 21 relate to the following scenario

There is a continuity test to be conducted on the main protective bonding conductor within a large industrial installation. The gas installation pipe work, water pipe work and steel framework of the building have all separately run conductors connected to the MET. Each conductor is concealed at various parts along their run. All connection to the extraneous conductive parts are remote from the MET.

If the conductor to the gas pipe was 10mm2 and the length of the cable was approximately 27m. What would be the expected reading when tested on the pipe work after the clamp?

0.08Ω

Correct Incorrect Correct answer

0.05Ω

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0.03Ω

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1.04Ω

Correct Incorrect Correct answer

Questions 17 – 21 relate to the following scenario

There is a continuity test to be conducted on the main protective bonding conductor within a large industrial installation. The gas installation pipe work, water pipe work and steel framework of the building have all separately run conductors connected to the MET. Each conductor is concealed at various parts along their run. All connection to the extraneous conductive parts are remote from the MET.

Which of the following instruments would be used to carry out this test?

Continuity tester

Correct Incorrect Correct answer

Low resistance ohmmeter

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Earth electrode tester

Correct Incorrect Correct answer

Voltage indicator

Correct Incorrect Correct answer

Questions 17 – 21 relate to the following scenario

There is a continuity test to be conducted on the main protective bonding conductor within a large industrial installation. The gas installation pipe work, water pipe work and steel framework of the building have all separately run conductors connected to the MET. Each conductor is concealed at various parts along their run. All connection to the extraneous conductive parts are remote from the MET.

What additional items would be required for this test and the considerations needed for this item?

Proving unit to test the bonding clamp is suitably connected to the gas or water services

Correct Incorrect Correct answer

A link between line and cpc where the resistance of the link is nulled or zeroed

Correct Incorrect Correct answer

Wander lead where the resistance of the lead is added to the reading for the overall result

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Zeroed or nulled wander lead as the conductors extend further than the standard test leads

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When testing an RCD to BS EN 61008 at 1 x I∆N what would be the maximum permitted disconnection time?

400ms

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200ms

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300ms

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40ms

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When carrying out an external earth fault loop impedance test what must be disconnected?

All lighting circuit and their cpcs

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All power circuits and their cpcs

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The bonding and earthing conductor

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The supply and earthing conductor

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The maximum permitted value of voltage drop for a 230V power circuit would be which one of the following values?

5V

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3V

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11.5V

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6.9V

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What would be checked by visual inspection to verify that Additional Protection is suitably provided by an RCD?

≤ 150mA

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I∆N ≤ 100mA

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I∆N ≤ 30mA

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I∆N ≤ 300mA

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If the Main Protective Bonding Conductor cannot be seen throughout its length what should be undertaken?

Be replaced with another

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Exposed to see the conductor’s entire length

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Continuity tested the conductor

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Conductor pulled to check for any breaks

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When is it acceptable to enter a cross against any item detailed within the schedule of inspection for new works?

Under no circumstances

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Should an item listed be not applicable

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When the Earthing Conductor is under sized

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Where the installation earth electrode is corroded

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How would a non-compliance be recorded on an inspection schedule during a periodic inspection?

Cross

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Lim

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C Code

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FI Code

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What would generally be the most common reason for crackling/arching sound coming from an existing lighting switch?

Loose connection in the line terminal

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Loose connection in the earth terminal

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Overloaded circuit breaker

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Oversized rating of the switch

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What would be verified using the sense of touch during an initial verification?

Suitable type of conductors

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Terminations of conductors

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Suitable size of conductors

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Identification of conductors

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What code would be given where access to a room is limited and the inspector suspects corrosion to a bonding clamp?

FI

Correct Incorrect Correct answer

LIM

Correct Incorrect Correct answer

C2

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C3

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What classification code would be used when discovering a severely damaged switch fused connection unit?

C2

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FI

Correct Incorrect Correct answer

C3

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C1

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What IP rating is suitable for jets of water from any direction?

IPX3

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IPX5

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IPX4

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IPX6

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Where a horizontal top surface of a distribution board has a rating of IP4X, what diameter of wire should not be able to penetrate that barrier/enclosure.

> 1mm

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> 12.5mm

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> 0.50mm

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> 2.5mm

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Which one of the following tests does not require GS38 compliant leads?

Insulation resistance

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Phase rotation

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Continuity of protective conductors

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Prospective fault current

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Which of the below is a suitable method of testing the function of an insulation resistance tester?

Test a known length of cable

Correct Incorrect Correct answer

Test with the probes open and closed

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On a known 230V supply

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Checking the calibration certificate

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Which particular test below can also be used to confirm polarity of a circuit?

RCD integral button

Correct Incorrect Correct answer

Insulation resistance

Correct Incorrect Correct answer

Long lead continuity

Correct Incorrect Correct answer

Continuity R1 + R2

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Voltage drop is verified using which one of the following methods?

(R1 + R2) x 1.2 x In

Correct Incorrect Correct answer

(R1 + Rn) x 1.2 x Ib

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(R1 + Rn) x 1.2 x In

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(R1 + R2) x 1.2 x Ib

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2391-51 Extra questions for MC paper 1

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