14. List the five essential requirements for device designed protect
against overcurrent.
.3. Briefly explain why electrical installation needs protective devices. circuit protective conductor
c. 0. overcurrent
c. 5. fault protection
b.
15. List the four factors which the selection protective device
depends. very low resistance
c. very high resistance. fuses MCBs the live conductor
d. According IEE Regulation 411. current which exceeds the rated current otherwise healthy
circuit one definition of:
a. State the meaning ‘discrimination’ applied circuit protective
devices.
16.
18.
19. fault protection
b.
13.11. Briefly describe the action fuse under fault conditions.0s
d.2 all final circuits not exceeding
32A building supplied with 230V supply shall have a
maximum disconnection time not exceeding:
a. The weakest link the circuit designed melt when overcurrent
flows one definition of:
a. fuse
d.
12. ensure the effective operation the overcurrent protective devices,
the earth fault loop path must have:
a. short-circuit current.
17.2. 0. unlimited. consumer unit.4s
c. overload current
d.2s
b. 230V supply
b
