Week 3 Electrical Installation Part 1

All the above are examples of conductor, except:

• Cooper

• Aluminium

• Silver

• Paper

A good conductor must be able to follow all the above, except:

• Transmit current efficiently

• Maximum heat released during transmission

• Resist fire for considerable period

• Fairly light in weight

What is the type of wire for household domestic wiring?

• Flexible PVC or PVC/PVC

• House Service overhead System (H.S.O.S)

• Mineral Insulated Copper Sheathed (M.I.C.S)

• Paper Insulated Lead Sheath Steel Tape Armoured

What is the advantage of underground cable?

• Less durable to the environment

• Very expensive

• Safety factors are higher

• Can withstand until 150 degree celcius

How does Capacity of Voltages and Current can effect the choosen of wire and cable?

• Bigger wire will be able handle higher voltage

• Able to resist biting or gnawing of vermins or rodents

• Voltage drop will exceed 2.5% of voltage supply

• Anti-corrosive to chemical or acid.

Which statement is correct about Stranded vs Solid Wire?

• smaller strands wire can carry more power

• smaller strands are less expensive

• solid wire can carry more power

• electricity flows through the middle of wire

What is the purposes of ducting?

• To increase voltage

• To provide extra protection against pest & accident

• To ensure electricity is not leak from wire/cable

• To utilize the common underground trenches with other utilities

All below are TRUE about conduit, except:

• Rectangular or square ducting bigger in size

• Protects the cable from physical damage and heat.

• Material: Galvanised iron (GI) & Unplasticized polyvinyl chloride (UPVC)

• Circular ducting, smaller in size

The metal tray has different sizes of holes, so that plastic or aluminum grip can hold the cables or wire to the tray.

• True

• False

If you are required to choose between trunking and conduit for wire installation in your house, which one is your choice? Justify your answer.