17. Briefly explain why electrical installation needs protective devices.4s
c. State the meaning ‘discrimination’ applied circuit protective
devices. circuit protective conductor
c. fuse
d.2s
b. unlimited. very high resistance. List the four factors which the selection protective device
depends. fault protection
b.
19. 0. According IEE Regulation 411. Briefly describe the action fuse under fault conditions.
14.
13.0s
d.2 all final circuits not exceeding
32A building supplied with 230V supply shall have a
maximum disconnection time not exceeding:
a. current which exceeds the rated current otherwise healthy
circuit one definition of:
a.
16. consumer unit. List the five essential requirements for device designed protect
against overcurrent. very low resistance
c. The weakest link the circuit designed melt when overcurrent
flows one definition of:
a. overcurrent
c. short-circuit current.
18. 0.
12. fault protection
b.2. overload current
d. 230V supply
b. ensure the effective operation the overcurrent protective devices,
the earth fault loop path must have:
a.
15. 5. fuses MCBs the live conductor
d.3.11.
