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Ask The Trades › DIY Forum › Electrical Questions › Earth fault.

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Earth fault. (Read 9993 times)

JohnDavies GDPR opt-out	Re: Earth fault. Reply #17 - Feb 1^st, 2005, 10:56am Will get Ze checked when I have the job inspected on cmpletion. I think it's one of the standard tests anyway. Thanks again JohnD
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JohnDavies GDPR opt-out	Re: Earth fault. Reply #18 - Feb 1^st, 2005, 11:15am Righto. Thanks JohnD
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supersparky

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Re: Earth fault.
Reply #19 - Feb 1^st, 2005, 1:40pm

well if u found you had a Ze value of 600 ohms i think you would be happy you checked

ze is the imendence from the supply terminals of the recs transformer to the supply incomre in your house.

R1 is resistance of phase (live)
R2 is resistance of earth...which were supposed to call the CPC conductor now

Zs is the actual earth loop impendence (total)

Zs = Ze + R1 + R2

ss

« Last Edit: Feb 3^rd, 2006, 12:20am by LSpark »

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supersparky Administrator Trade Member Author Offline Posts: 6097 Total Thanks: 3 For This Post: 0 Gender: Trade: Electrician	Re: Earth fault. Reply #20 - Feb 1^st, 2005, 1:52pm i modified that last 1 mate. the "expected" value (the MAX supposdly for Ze) on a TNS is 0.8 ohms On a TNCS its 0.35 ohms like bugger id take their values ss
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supersparky Administrator Trade Member Author Offline Posts: 6097 Total Thanks: 3 For This Post: 0 Gender: Trade: Electrician	Re: Earth fault. Reply #21 - Feb 1^st, 2005, 3:41pm yeh they are the max ze figures....the one you will be given by the rec to cover emselfes ss
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Ask The Trades › DIY Forum › Electrical Questions › Earth fault.