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- Sketch the appropriate BS EN 60617 locationsymbol
i) Switched socket outlet
ii) Lighting outlet
iii) Distribution Board
iv) Two way switched
- Explain by the aid of two diagrams thedifference between a fused switch and switched fuse
3. List the test instruments to be used and typicalmeasurement range for each of the tes
- Continuity of protective conductor for ringfinal circuit
- Insulation resistance test at distribution board
- Polarity test on lighting circuit
- Load current
- Rating of protective device
- Minimum cable rating
- Minimum cable size
- Maximum permitted voltage drop
- Actual voltage drop
- Lighting trunking to be supported from steelroof trusses
- Multiple run of mineral insulated cables along a brick wall
- Multiple communication and data cablesalong corridors
- Megohm
- Milli-seconds
- Ohms
- KA
8. Explain with the aid of a diagram how to carryout an earth loop impedance test on a single phase socket outlet forming part of a TN-C-S system supplied at230 v , the diagram should include the test instrument and show the completeearth fault path using arrow
9. The loop values achieved for step 1 of a ring final circuit test are
- L to L = 0.8 ohm
- N to N= 0.8 ohm
- Cpc to cpc = 1.3 ohm
- Calculate the values expected when testing at all outlets for step 2 andstep 3 of the test
- State why the CPC loop reading is higher thanthat of the live conductors
10.
A) List inthe correct sequence the three test to be carried out on a newly completedlighting circuit
B)State the three test current used toconfirm the compliance of a 30 mA RCD protecting equipment located outdoors
11. At the completion of an electrical installation,it is inspected and tested state the
- Necessary paperwork to be completed and handedto the customer/client
- Responsibility of the electrical contractor withregard to periodic inspections
- Certification which must be completed by theelectrical contractor who at a later date carries out minor additions oralterations to the installation