Is called short circuit fire, when insulation of electric wiring getting old with time in old wooden board houses of cold countries, and are the main cause of fire( 40 to 50 %) next to heating(gas) system. It can be reduced by periodic inspection and maintenance if needed and certified by city office personals. Spark appear in loose connection, or due to bad insulation between live wires or live wires and  earth/neutral, and is the main cause, as current would not be sufficient for fuse to blow out.

Conductor clashing could mean many things.  Wikipedia defines it in terms of transmission lines coming into contact.  It could also mean the use of dissimilar metals in building wiring.   I'll assume the latter.  This was a serious problem in the US when aluminum conductors were used in house wiring.  This is no longer done.  There is a move to replace the aluminum conductors with copper but the cost is borne by the homeowner.   This is the obvious solution but can be quite expensive.   

Aluminum conductors were thought to be safe, but the installation required the use of compatible fixtures and connectors, and the use of oxidation-preventing compounds on every joint.   This was not a good solution because the compound was not universally used by installers, and aluminum compatible connectors were sometimes not used by installers, or when new fixtures were installed.  Many house fires resulted.  The problem is that the deficiency may not become apparent for many years, so there is no immediate way to detect an improper installation.

I primary meant on conductor clashing of overhead lines that causes fire, burning in nature. 

Oh.

Read,'Phenomena of arcing ground".  will get answer.

I'm interested in situation when two conductors clash and produced hot sparks that fall to the ground can potentially create fire?

I have seen , Pam trees, under H.T lines, fired by, these type(conductor clashing) of tamperori fires, by high wind of high sag lines, at my native place in India..