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meady

low pfc on tt system

6 posts in this topic

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

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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.

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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

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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.

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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

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All with RCD protection i take it ? :Pray

Yep, cabin on an rcbo

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