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An electrical disconnect has to be within 20 feet and line of sight of the equipment you are working on. This electrical rule was brought about because most times the distribution motor starter is in another part of a building in an electrical room. If you can not see that the motor starter is locked out or it is more that 20 feet distance from the motor an isolation switch has to be added to the circuit at the motor. This allows anyone working on the motor to lock it out near the motor. If the motor starter does not get locked out and inadvertently starts automatically, the local isolation switch will stop the current flow and provide a safety factor to the person working on the motor.

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โˆ™ 2011-07-24 18:46:29
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In a series circuit the is the same at every point

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