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What Is The Reason ?

Answer :
Overloading:
  1. When too many devices are connected to the same circuit and are operated at time, the wire draws a much large current (greater then its capacity) from mains is called overloading.
  2. This causes heating in the circuit that can lead to sparking.
What causes loose electrical connections?

There are many factors that can contribute to loose electrical connections, such as:

  • Age and wear of the wires and terminals
  • Improper installation or repair of the electrical system
  • Vibration, movement, or expansion and contraction of the wires and terminals due to temperature changes
  • Corrosion, rust, or oxidation of the metal parts
  • Excessive current or voltage that exceeds the capacity of the wires and terminals

Loose electrical connections can occur anywhere in the electrical system, but they are more likely to happen in places where there is frequent movement or stress, such as outlets, switches, light fixtures, appliances, and junction boxes.