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Cal/OSHA Guide to Electrical Safety· PDF fileThe current ratings of fuses and circuit breakers are so high (15 to 30 amperes for most residences) that they cannot protect hock. When the current flow exceeds the rated levels, the fuse melts or the circuit breaker is tripped. In either case, the circuit is broken and current can no longer flow. Grounding Electrical systems, equipment and tools

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