12.11. 230V supply
b.2 all final circuits not exceeding
32A building supplied with 230V supply shall have a
maximum disconnection time not exceeding:
a. 0. overcurrent
c. fuses MCBs the live conductor
d. short-circuit current. 0. very high resistance. current which exceeds the rated current otherwise healthy
circuit one definition of:
a.2.
13. unlimited.
15.0s
d. The weakest link the circuit designed melt when overcurrent
flows one definition of:
a. circuit protective conductor
c.4s
c. fault protection
b. 5. State the meaning ‘discrimination’ applied circuit protective
devices. List the four factors which the selection protective device
depends. overload current
d.2s
b. fuse
d.
17.
.3. very low resistance
c. Briefly explain why electrical installation needs protective devices. List the five essential requirements for device designed protect
against overcurrent.
18.
14. According IEE Regulation 411. ensure the effective operation the overcurrent protective devices,
the earth fault loop path must have:
a. consumer unit.
16. Briefly describe the action fuse under fault conditions.
19. fault protection
b
