Out of date I&T questions

Some of these questions are now out of date but some are still usable

(In the process of being updated)

[A] Legislation and documentation

List 3 of areas of responsibility specified by GN3 for an inspector carrying out Inspection and testing
List 3 warning notices that should be found in an installation when conducting a visual inspection
A new fused spur is to be added to an existing ring final circuit. list 3 documents that should be completed by the electrician
State the legal status of the following: (i) Electricity at Work Regulations 1989, (ii) GS38, (iii) GN5
List 3 non-statutory documents associated with Inspection and Testing
List 3 statutory documents associated with Inspection and Testing
After opening a Temperature controller panel you notice that the wiring is coloured black with some red, orange, white and grey coloured conductors. What regulations are they governed by and what methods would you expect to use to identify their application?

[B] General Characteristics

List 3 items considered to be general characteristics of an Electrical System
List 3 conductors associated with: (i) MET to Supply intake, (ii) Metal Bath to Radiator, (iii) Instantaneous water heater to lighting circuit (iv) Lightning conductor to MET
Why is it important to check for Neutral sizes in Industrial Installations
Identify the following earthing systems: (i) Earthing conductor connected to incoming Neutral, (ii) Earthing conductor connected to an Earth Electrode, (iii) Earthing conductor connected to the suppliers cable Sheath
What 3 frequencies are commonly used to supply AC electrical energy in the UK?
How might a RCD be detrimentally influenced by other electrical services and supplies?

[C] Circuits and Testing

A ring final circuit phase conductor measures end to end 0.35 Ohms and its corresponding cpc measures 0.58 Ohms calculate R1+R2
List 3 items that should be tested for polarity
An insulation Resistance test identifies 3 circuits have an IR of 100M Ohms, 2 Circuits of 10M Ohms and 1 Circuit having 5M Ohms. What is the total Insulation Resistance?
Name/List the tests required to verify the correct working of an RCD used for supplementary protection against Direct Contact
If the maximum values of earth fault loop impedance are given as 8, 1.2, 5.6 Ohms respectively and the measured values for each circuit are 6.8, 0.96, and 4 Ohms. Check for compliance using an appropriate method and show all calculations
State 3 possible methods of verifying the continuity of a protective conductor on a radial circuit
List the recommended sequence for testing a new Ring final circuit
List the sequence of events for Safe Isolation

[E] Protective Methods and Devices

List 3 methods of compliance with EEBADS where either there is greater risk of shock and/or where disconnection times cannot be achieved
State for an RCD: (i) How often the test button should be operated, (ii) The purpose of the manual test (iii) the maximum operating time of a 20mA RCD
State and explain the meaning of 3 characteristics printed on a BS60898 protective device
At what of test current should be applied to a 10mA RCD used as supplementary protection against Direct contact?
List 3 locations where RCDs should be installed for protection against Fire
State the MBCs of a (i) type 1 BS1361, (ii) type 2 BS88, (iii) Standard non-industrial BS60898
Where should the following recommended current rated RCDs be Installed: (i) 30mA, (ii) 100mA, (iii) 300mA, (iv) 500mA, (v)1A
Give 3 locations where and the reasons why a 500mA RCD should be used
State 5 methods of reducing the resistance of an Earth electrode

[F] Science principles

State the effect that each would have on the resistance value of a conductor: (i) increasing the length, (ii) decreasing the CSA, (ii) decreasing the temperature
State 3 disadvantages of using Aluminium conductors as opposed to Copper
State 3 problems associated with mixing Aluminium conductors terminated into Brass terminal lugs
Convert the following values to milli Ohms: (i) 0.5 Ohms, (ii) 0.02 Ohms (iii) 0.15 Ohms
Convert the following values to Amps: (i) 250mA, (ii) 1mA, (iii) 30mA
By proportion, calculate the CPC resistance values of the following conductors where the measured values of R1+R2 are given: 2.5mm2 T&E, 0.48 Ohms; (ii) 4.0mm2 T&E 0.35 Ohms, (iii) 6.0mm2 T&E 0.24 Ohms, (iv) 1.5mm2 MICC (csa 11mm2), (v) 2.5mm2 3-core SWA (csa 22mm2, Rv = 45milliOhm metre)

[G] Instruments

List 3 instruments used in 'dead' testing
List 3 instruments used for 'live' testing
Name the 3 electrodes associated with earth electrode testing
State 3 design requirement for GS 38 test probes
State the minimum resolution for a Low Resistance Ohmmeter; the maximum percentage tolerance of an RCD tester; the maximum tolerance value for an Earth Loop impedance tester
State 3 methods of verifying the continuity measurement of a Low Reading Ohmmeter
Give 2 reasons when testing continuity of a ring final circuit you get varying results that differ by > 0.01ohm

[H] Special Locations

List 2 locations where reduced disconnection times are permitted
List 3 locations where Socket outlets are not permitted
List 3 locations where SELV equipment can be installed
State 4 requirements for the location of socket outlets installed within the zones of a Swimming Pool
Name 3 methods of compliance with shock protection where circuits have high protective conductor currents
What does the term 'Intrinsically Safe' mean?
Why is it important that your test instruments conform to GS 38 where there is the likelihood of fire or/and explosion
List 6 environments that might require the use of intrinsically safe test instruments
List 3 possible outcomes when non-intrinsically safe equipment and instruments are used in a special location containing inflammable gases

[I] Documentation

Name 4 persons who should be identified on an Electrical Installation Certificate
List the standard documents that would accompany a PIR
List 3 supplementary documents (excluding the above) that would accompany an EIC
State 2 test results that should be recorded on a schedule of tests results but if using the IEE forms have no identified place

[J] Fault Finding and Testing

Describe a method of finding a ring final fault where the IR for that circuit is 0.09M Ohms, the ring R1 + R2 tests out at 0.56 Ohms at each socket.
State a method and list the sequence of events to find the cause of a non-working bathroom extractor fan
Explain why it is incorrect to isolate a motor circuit by using only the emergency stop buttons
List 4 considerations that should be taken into account when changing a high-bay High Pressure Sodium Lamp
Give 3 reasons why when IR testing the Value of P-N = >1G and P/N - PE = 0.1M