Section 1
Conductors and terminations
Name the two most common conductors used by electricians.
Define resistivity.
Find the resistance of a copper conductor $60 \mathrm{~m}$ in length if it has a CSA of $4.0 \mathrm{~mm}^2$. The resistivity of copper is $1.72 \times 10^{-8} \Omega \mathrm{m}$. Note: $4.0 \mathrm{~mm}^2=4.0 \times$ $10^{-6} \mathrm{~m}^2$.
Which of the two materials, copper and aluminium, is the better conductor?
State the nominal minimum CSA of a copper aerial conductor.
State one advantage aluminium has over copper as a conductor material.
Define the term 'creep' or 'cold flow' as applied to aluminium conductors.
How can the problem of creep be resolved in aluminium conductors?
Why are annealed copper conductors used in stranded form?
Define the term 'unilay'.
Name one type of wire grouping.
What are the consequences if a conductor that is too small for the load current passing through it is used?
Name two types of conductor terminations.
What is the purpose of millivolt testing on terminations?
List the important characteristics of solder.
What is a eutectic alloy?
What is oxidation?
State an important factor in thermal transfer for soldering with lead-free solders.
What is an ideal method for inspecting terminations of critical electrical equipment?
State the differences between joins, taps and splices.