electrical connections can become dangerous even when the excess load does not appear dramatic.
A loose plug, damaged contact, or worn socket can create additional resistance. When a substantial electrical current passes through that connection, heat can accumulate.
If the temperature becomes high enough, plastic insulation may soften or melt. Internal components can become damaged, and electrical arcing may occur.
Arcing happens when electrical current jumps across a gap between conductive surfaces. It can generate extremely high temperatures and may ignite nearby combustible materials.
Several factors can make this process