Q3. (a) Describe the principle of operation of EACH of the following detecting elements: (8)
(i) Bi-metal strips
(ii) Thermistors
(b) Explain, with the aid of sketches, typical applications where the devices described in (a) may be employed in high voltage electrical systems. (8)
Q3. (a) State FIVE essential electrical services that should be operable under fire conditions. (8) (b) Explain how electric cables for the essential services in part (a) pass through bulkheads whilst maintaining gas tight and watertight integrity. (4)
(c) State the requirements for the cables which supply electrically driven emergency fire pumps. (4)
Q3.a) How protection is provided for electrical short circuit. (4)
b) Describe the construction and operation of HRC fuses? (8)
c) What are the advantages of HRC fuses. (4)
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