In-service Inspection and Testing of Electrical Equipment

1
In-service Inspection and Testing of Electrical
Equipment

• The most suitable method for testing equipment
  supplied by a BS 1363 plug is by means of
• A dedicated portable appliance test instrument
• An insulation resistance test instrument
• An earth fault loop impedance tester
• A continuity test instrument

2
In-service Inspection and Testing of Electrical
Equipment

• 2. Class II equipment may be constructed
  with
• earthed metalwork separated from live parts by
  basic and supplementary insulation
• earthed metalwork separated from live parts by
  basic insulation only
• unearthed metalwork separated from live parts by
  basic insulation only
• unearthed metalwork separated from live parts by
  basic and supplementary insulation.

3
In-service Inspection and Testing of Electrical
Equipment

• 3. Hazardous voltages may appear on exposed
  metal parts of Class I electrical equipment in
  the event of
• Insulation failure between live conductors
• Contact between live parts and basic insulation
• Insulation failure between live conductors and
  protective earthing
• Contact between live parts and supplementary
  insulation.

4
In-service Inspection and Testing of Electrical
Equipment

• 4. For protection against electric shock,
  Class III equipment relies upon a supply derived
  from a
• Separated extra-low voltage source
• Functional extra-low voltage source
• Protective extra-low voltage source
• Safety extra-low voltage source
• 
  

Figure 1
5
In-service Inspection and Testing of Electrical
Equipment


6
In-service Inspection and Testing of Electrical
Equipment

• 5. Refer to Figure 1. The Method of
  protection against electric shock from equipment
  bearing the construction mark shown is by
• Basic insulation without the provision for an
  earth connection
• Double or reinforced insulation without the
  provision for an earth connection
• Basic insulation with the provision for an earth
  connection
• Double or reinforced insulation with the
  provision foe an earth connection.

7
In-service Inspection and Testing of Electrical
Equipment

• 6. Which one of the following diagrams shows
  the Class II construction mark?
• 
  c.
• b.
  d.

II
II



8
In-service Inspection and Testing of Electrical
Equipment

• Which one of the following types of equipment in
  shops and offices is considered the most likely
  to develop dangerous faults?
• Movable
• Stationary
• Portable
• Hand-held

9
In-service Inspection and Testing of Electrical
Equipment

• The suggested initial frequency of combined
  inspection and testing on a Class I hand-held
  food mixer in a commercial kitchen is
• One month
• Three months
• Six months
• Twelve months

10
In-service Inspection and Testing of Electrical
Equipment

• 9. When deciding the duration between
  inspection and testing on a item of equipment,
  where the Class of equipment is not know, it
  should be treated as
• Class 0
• Class I
• Class II
• Defective

11
In-service Inspection and Testing of Electrical
Equipment

• 10. The suggested initial frequency between
  combined inspection and test on a Class I hair
  dryer within a hotel room is
• 6 Months
• 12 Months
• 24 Months
• 48 Months

12
In-service Inspection and Testing of Electrical
Equipment

• 11. Which one of the following would not form
  part of a user check on equipment?
• Suitability for the environmental conditions
• Fuse size
• Suitability for the intended use
• Flex condition

13
In-service Inspection and Testing of Electrical
Equipment

• 12. If a faulty plug is discovered on a
  appliance, the user should
• Replace the plug and update the test label
• Replace the plug and record on the repair
  register
• Take the equipment out of service and report to
  the responsible person
• Take the equipment out of service by cutting off
  the plug

14
In-service Inspection and Testing of Electrical
Equipment

• 13. When conducting a formal visual
  inspection on a equipment used outdoors, it is
  important that the equipment has a suitable
• IP rating
• GS rating
• IT rating
• GP rating

15
In-service Inspection and Testing of Electrical
Equipment

• If an inspector consider that the equipment being
  tested is not suitable for the environment, this
  should be
• Reported to the Health and Safety Executive
• Recorded and brought to the attention of the
  responsible person
• Reported to the manufacturer of the equipment
• Recorded after the operative has been instructed
  as to the possible danger.

16
In-service Inspection and Testing of Electrical
Equipment

• 15. The most cause of overheating of a standard
  13 ampere plug would be
• A loose connection at one or more of the
  terminals
• Reversed polarity of the cable conductors
• Inadequate earthing connections
• The use of an incorrectly rated cartridge fuse.

17
In-service Inspection and Testing of Electrical
Equipment

• 16. Where equipment has a rating of 500 W, the
  manufactures recommended rating of the BS 1362
  fuse fitted in the plug is
• 3 A and will be coloured red
• 3 A and will be coloured blue
• 5 A and will be coloured red
• 5 A and will be coloured blue

18
In-service Inspection and Testing of Electrical
Equipment

• 18. One purpose of carrying put an earth
  continuity test, using a low current ohmmeter on
  equipment which relies on functional earthing, is
  to ensure that the
• Touch current measurements are satisfactory
• Equipment conforms to the requirements of BS 7822
  
• Earthing allows the equipment to operate
  correctly
• Means of isolation from the supply are accessible

19
In-service Inspection and Testing of Electrical
Equipment

• 19. Dielectric strength testing is
• Only normally carried out during in-service
  testing
• Carried out only under supervision by the duty
  holder
• Not normally carried out during in-service
  testing
• Only carried out if requested by the supervisor.

20
In-service Inspection and Testing of Electrical
Equipment

• 20. Portable appliance tester may, in some cases,
  be used for earth continuity testing using a low
  value of test current, typically
• 50 mA, know as a slow test
• 50 mA, know as a soft test
• 100 mA, know as a slow test
• 100 mA, know as a soft test

21
In-service Inspection and Testing of Electrical
Equipment

• 21. Test equipment used for portable appliance
  testing must be
• Designed solely for appliance testing
• Finished in a bright yellow casing
• Suitable and safe for use
• Contained within one casing

22
In-service Inspection and Testing of Electrical
Equipment

• 22. The minimum acceptable value of insulation
  resistance for equipment supplied from a SELV
  source must not be less than
• 250 k?
• 0.5 M?
• 1.0 M?
• 2.0 M?

23
In-service Inspection and Testing of Electrical
Equipment

• 23. Which one of the following equipments labels
  complies with the requirements of the Code of
  Practice for the In-Service Inspection and
  Testing of Electrical Equipment?
• a.
  c.
• b.
  d.

A. LOGO Equipment type.. Initials Appliance No Serial No..
A. LOGO Date of last check Initials Serial No Next
A. LOGO Construction type. Serial No.. Initials.. Date of last test.
A.LOGO Date of check. Initials. Appliance No Next test before.
24
In-service Inspection and Testing of Electrical
Equipment

• 24. From present and previous test results, a
  deterioration in an item of Class II equipment
  would be indicated by
• An increase in insulation resistance
• A decrease in insulation resistance
• An increase in earth continuity
• A decrease in earth continuity resistance

25
In-service Inspection and Testing of Electrical
Equipment

• 25. Faulty equipment must be labelled, reported
  and, if unsafe
• Returned to the manufacture for repair
• Removed from use without delay
• Repaired by the responsible person
• The name of the last user noted

26
In-service Inspection and Testing of Electrical
Equipment

• 26. The main purpose of the cartridge fuse fitted
  within a standard 13 A plug is to protect the
  appliance
• From overload
• From short circuit
• Cord set
• From overheating

27
In-service Inspection and Testing of Electrical
Equipment

• 27. Which one of the following procedures is
  applicable to an extension lead fitted with a
  standard three-pin socket outlet?
• Visual inspection, insulation and polarity tests
• Visual inspection, earth continuity, insulation
  and polarity tests.
• Earth continuity, insulation and polarity tests.
• Insulation and polarity tests.

28
In-service Inspection and Testing of Electrical
Equipment

• 28.When testing microwave ovens, a functional
  check should ascertain that opening the door
  result in
• The oven setting returning to zero
• Actuation of the oven sounder device
• Stopping the rotation of any turntable
• Reliable interruption of the oven power

29
In-service Inspection and Testing of Electrical
Equipment

• 29. Information Technology equipment which is not
  constructed to BS EN 60950 may be damaged by
  measurement of insulation resistance by applied
  voltage. The test that should replace the above
  is
• A polarity test
• A dielectric strength test
• A battery powered continuity test
• An earth leakage/touch current test.

30
In-service Inspection and Testing of Electrical
Equipment

• 30. When performing an insulation resistance test
  of IT equipment to BS EN 60950, insulation
  breakdown is considered to have occurred when the
  insulation does not restrict the
• Normal flow of current
• Uncontrolled earth leakage
• Normal earth leakage
• Uncontrolled flow of current.