Reference no: EM132588253

Assignment - Installation Questions

Question 1 -

a) i. Define the term safety.

ii. State four causes of accidents in a workshop.

iii. State four classes of fire

b) i. Define the term electric shock.

ii. State three factors that determine the severity of electric shock

iii. State five safety rules in the workshop

Question 2 -

a) Draw the architectural symbols of the following

i) Consumer control unit

ii) Main switch

iii) Twin socket outlet

iv) Bell

v) Buzzer

b) Define the following

i. Accessory

ii. Appliance

iii. Final circuit

c) i. State any three final circuits in a domestic installation

ii. Draw a labelled single line diagram showing correct sequence of equipment at a single-phase consumer intake point.

Question 3 -

a) Draw the following final circuits

i) A lighting circuit with three lamps such that lamp L₁ and L₂ are connected in parallel and controlled by a one-way switch S₁ and lamp L₃ looped in from same circuit and controlled by switch S₂ only.

ii) A ring circuit comprising three sockets outlets and a fused spur.

b) i. Give the colour codes used to identify the three live conductors used in three phase installations.

ii. State four factors to consider when selecting a wiring system

iii. State any three tests carried out on a newly completed installation.

Question 4 -

a) State three properties of each of the following materials used in electrical cables.

i. Copper

ii. Brass

b) i. State four types of wiring systems.

ii. State three main parts of a cable

c) State two advantages of the following fuses

i) Rewire-able fuses

ii) High rapturing capacity fuses

d) State THREE IEE regulation requirements of conduits.