M.H. Illusrated Guide to Electrical Exam Prep...2011

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ZCBee

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On page 79, for illustrative purposes, Mike's image and calculation of energy used and a monthly cost in a ground fault condition raises a question for me; Why hasn't the fault cleared?

The example shows a 120V source, 25 ohms to earth ground fault.

The first thought that comes to my mind is a faulty circuit breaker. The other is an open EGC or an open neutral. Would like to query other possible causes for this condition.
 
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Hv&Lv

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ZCBee said:
On page 79, for illustrative purposes, Mike's image and calculation of energy used and a monthly cost in a ground fault condition raises a question for me; Why hasn't the fault cleared?

The example shows a 120V source, 25 ohms to earth ground fault.

The first thought that comes to my mind is a faulty circuit breaker. The other is an open EGC or an open neutral. Would like to query other possible causes for this condition.
Click to expand...

Can't see the picture, but according to your numbers, the current is only 4.8 amps. a breaker will hold that for a very long time.
 
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