overload current
d.
13.
14.
. Briefly explain why electrical installation needs protective devices. fuses MCBs the live conductor
d.0s
d. unlimited.4s
c.
18.
16.
17.11. fuse
d. 0. overcurrent
c. According IEE Regulation 411. ensure the effective operation the overcurrent protective devices,
the earth fault loop path must have:
a. very low resistance
c. circuit protective conductor
c. fault protection
b. The weakest link the circuit designed melt when overcurrent
flows one definition of:
a. 230V supply
b. short-circuit current. fault protection
b.3.
15.
19. very high resistance.
12.2 all final circuits not exceeding
32A building supplied with 230V supply shall have a
maximum disconnection time not exceeding:
a. State the meaning ‘discrimination’ applied circuit protective
devices. Briefly describe the action fuse under fault conditions.2s
b. List the four factors which the selection protective device
depends. current which exceeds the rated current otherwise healthy
circuit one definition of:
a. consumer unit. 5. 0. List the five essential requirements for device designed protect
against overcurrent.2
