In-service Inspection and Testing of Electrical Equipment - PowerPoint PPT Presentation

in service inspection and testing of electrical equipment n.
Download
Skip this Video
Loading SlideShow in 5 Seconds..
In-service Inspection and Testing of Electrical Equipment PowerPoint Presentation
Download Presentation
In-service Inspection and Testing of Electrical Equipment

play fullscreen
1 / 30
In-service Inspection and Testing of Electrical Equipment
446 Views
Download Presentation
turi
Download Presentation

In-service Inspection and Testing of Electrical Equipment

- - - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript

  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.

  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 mostcause 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 kΏ • 0.5 MΏ • 1.0 MΏ • 2.0 MΏ

  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.

  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.