ground-fault interrupter is an unintentional electrical path between a source of electrical current and a grounded surface. Electrical shock can occur if a person comes into contact with an energized part. GFCIs (ground-fault circuit-interrupters) can greatly reduce the risk of shock by immediately shutting off an electrical circuit when that circuit represents a shock hazard (i.e., a person comes in contact with a faulty appliance together with a grounded surface). They are characterized by their adaptability to diversification of architectural specification .

positive protection against electronic shock .
tools will operate well because of overheating .and waterproof .
tools that operate at their design speed .

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