Answer Posted / tauseef tarique, engineer(e)

Loose connection is the most Dangerous thing in the
electrical enginnering and one should always avoid it.

Due to loose connection the contact resistance will
increase and when the current flows through it, it will
start heating at the connection point and if the current
continues the contact point may melt and disconnect the
supply.

Because of sparking due to loose connection the instrument
connected with this line may be damaged.

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