2.
18. State the meaning ‘discrimination’ applied circuit protective
devices. fuses MCBs the live conductor
d. Briefly explain why electrical installation needs protective devices. ensure the effective operation the overcurrent protective devices,
the earth fault loop path must have:
a.
12.2s
b. 230V supply
b. Briefly describe the action fuse under fault conditions.
17.
14. overcurrent
c. overload current
d. List the five essential requirements for device designed protect
against overcurrent. 5.4s
c. fault protection
b. fault protection
b. very high resistance.3.
15.0s
d. According IEE Regulation 411. 0.
. 0. unlimited. fuse
d.11.2 all final circuits not exceeding
32A building supplied with 230V supply shall have a
maximum disconnection time not exceeding:
a. List the four factors which the selection protective device
depends. circuit protective conductor
c.
13. consumer unit. current which exceeds the rated current otherwise healthy
circuit one definition of:
a. very low resistance
c.
16.
19. The weakest link the circuit designed melt when overcurrent
flows one definition of:
a. short-circuit current
