List the five essential requirements for device designed protect
against overcurrent.2 all final circuits not exceeding
32A building supplied with 230V supply shall have a
maximum disconnection time not exceeding:
a.11. very high resistance. fault protection
b. Briefly explain why electrical installation needs protective devices. 230V supply
b.
15. current which exceeds the rated current otherwise healthy
circuit one definition of:
a. fault protection
b. unlimited. According IEE Regulation 411.0s
d. The weakest link the circuit designed melt when overcurrent
flows one definition of:
a.
14.2s
b.
. fuses MCBs the live conductor
d.
12.3. 5. List the four factors which the selection protective device
depends.2.
18.
16. consumer unit. ensure the effective operation the overcurrent protective devices,
the earth fault loop path must have:
a. very low resistance
c. 0.
17. fuse
d. 0. State the meaning ‘discrimination’ applied circuit protective
devices.
13. circuit protective conductor
c. short-circuit current.4s
c. Briefly describe the action fuse under fault conditions.
19. overload current
d. overcurrent
c
