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low pfc on tt system


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5 replies to this topic

#1 meady

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Posted 26 August 2010 - 04:31 PM

Bit confused on my test results for a cabin with its own tt earthing system
I have installed 2 circuits, lights and sockets.

R1+R2 on lights =0.04
R1+R2 on sockets = 0.05

insulation on both circuits >500

ZS on lights = 111.3
ZS on sockets = 111.8

ZE = 110.4

PFC 2a :(
PSC 509a

Why would the PFC be so low? I retested it to make sure I had a good connection but got the same result. Any advice would be very much appreciated

#2 Andy™

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Posted 26 August 2010 - 04:33 PM

your PEFC is 2a for the simple reason of Ra being 110.4...

your PFC is the highest of PEFC and PSCC. in this case, 0.5KA. so its not low.

#3 Chr!s

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Posted 26 August 2010 - 05:08 PM

Meady

Your pefc is just the result of Volts Divided by your ze

so

Say you have 220 volts and a ze of 110ohms then your pefc will be 2 amps

regards chris

#4 meady

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Posted 26 August 2010 - 05:30 PM

thanks for info, just been swatting up on it all and its all sinking in now, been a long day and a few beers needed now.

#5 a1spark

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Posted 26 August 2010 - 05:55 PM

Bit confused on my test results for a cabin with its own tt earthing system
I have installed 2 circuits, lights and sockets.

R1+R2 on lights =0.04
R1+R2 on sockets = 0.05

insulation on both circuits >500

ZS on lights = 111.3
ZS on sockets = 111.8

ZE = 110.4

PFC 2a :(
PSC 509a

Why would the PFC be so low? I retested it to make sure I had a good connection but got the same result. Any advice would be very much appreciated




All with RCD protection i take it ? :Pray

#6 meady

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Posted 26 August 2010 - 07:24 PM

All with RCD protection i take it ? :Pray


Yep, cabin on an rcbo




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