3.0s
d.
19. 0.
16. short-circuit current. fault protection
b. overload current
d.
18. List the four factors which the selection protective device
depends.2 all final circuits not exceeding
32A building supplied with 230V supply shall have a
maximum disconnection time not exceeding:
a. ensure the effective operation the overcurrent protective devices,
the earth fault loop path must have:
a. 230V supply
b. fuse
d.11. current which exceeds the rated current otherwise healthy
circuit one definition of:
a. The weakest link the circuit designed melt when overcurrent
flows one definition of:
a. consumer unit. very high resistance.4s
c. overcurrent
c.
14.
12. Briefly describe the action fuse under fault conditions. unlimited. fuses MCBs the live conductor
d. Briefly explain why electrical installation needs protective devices. 5.2.
15. fault protection
b.
.2s
b. According IEE Regulation 411. 0. circuit protective conductor
c.
17. List the five essential requirements for device designed protect
against overcurrent. very low resistance
c.
13. State the meaning ‘discrimination’ applied circuit protective
devices
