Answer / rams

Bus bar means it is a current carrying device.Bus duct it
is a bus bar enclosing equipment

Answer / kj

Busbar is a conductor of electrical power. It is usually
made of copper but sometimes also of aluminium. It is
usually rectangular in cross section. Busbars are used
inside switchboards where it is normally not insulated but
protected from access by panels. The busbars are mounted on
insulating blocks.

A bus duct is an enclosure which contains a number of
busbars (phases, neutral and earth). It is used for
connection between switchboards. Here the enclosure us used
to protect the busbars from being touched. the busbars are
also held in insulating blocks.

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