Older or improperly installed electrical panels often do not have adequate electrical grounding for their systems.
As a result, the risk of serious electric shock from current leaking into un-insulated metal parts of an electrical panel is increased.
In a properly grounded system, such leaking current (called fault current) is carried away harmlessly. For this reason maintaining your home grounding systems is very important.
Although most electrical systems have fuses or circuit breakers for protection against a major fault current or short circuit. The human body may be fatally shocked by a current of less than one ampere. That is well below the point at which a fuse or breaker will operate.
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