Electric Cables ~ these are made up of copper or aluminium wires
called conductors surrounded by an insulating material such as
PVC or rubber.Conduits ~ these are steel or plastic tubes which protect the
cables. Steel conduits act as a cpc to earth whereas plastic
conduits will require a separate cpc drawn in. Conduits enable a
system to be rewired without damage or interference to the fabric
of the building. The cables used within conduits are usually
insulated only, whereas in non-rewireable systems the cables have
a protective outer sheath.Trunking † alternative to conduit and consists of a preformed
cable carrier which is surface mounted and is fitted with a
removable or `snap on' cover which can have the dual function of
protection and trim or surface finish.Electrical Installations