Discuss what does zs of 0.19 and pfc of 1.2ka mean? in the Electrical Forum area at ElectriciansForums.net

L

leedunning

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Hi i'm currently studying for my city and guilds electrical course and am stuck on this question.

i think i understand that the Zs of 0.19 means the time it takes for the breaker to trip but could somebody explain what this means in lehmans terms.

The actual question redas

Explain the relevance of the information which states the the Zs of the installation is 0.19 and a PFC of 1.2ka.
 
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P

pauln6157

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  • #2
hows it going lee,, did you find an answer for this question buddy cos im having trouble with it aswell
 
S

Silly Sausage

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  • #3
I take you mean Ze.

Think about what Ze (or Zs for a circuit) represents, what happens when you get a Line to Earth fault (of negligible impedance) and Ohm's Law
 
S

Silly Sausage

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  • #5
I would think so, seeing as this is 7 months old!! lol!!
Haha...hopefully the OP has, it's Paul's turn now! Got to help fellow Mancunians. :)

Draw out the Earth Fault Loop Impedance diagram and all will be revealed.
 
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