What is the difference between a 'dead' and an 'isolated' electrical circuit in railway safety terminology?
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A
They are interchangeable terms meaning the same thing
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B
Dead means unpowered but not locked out; isolated means de-energized, locked out, and grounded
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C
Dead means permanently disabled; isolated means temporarily powered down
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D
Isolated means the wire is insulated; dead means the circuit breaker is open