Blackening at the connection point of the AC busbar
Also look for evidence of shrunken or melted back insulation on cables attached to the bus bar. Bus bar connectors are the unsung heroes of electrical systems, providing efficient, low-resistance connections for distributing power across components. The busbar is exposed to (sulphuric fume) which turned into [sulphuric acid] with the wet surrounding air. Busbar is usually made from good conductive materials such as copper or aluminum.
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