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UK diy (uk.d-i-y) For the discussion of all topics related to diy (do-it-yourself) in the UK. All levels of experience and proficency are welcome to join in to ask questions or offer solutions. |
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#1
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Main equipotential bonding
I need to know what conductor size I must use to meet 17th edition. I
found a table at http://www.tlc-direct.co.uk/Book/5.4.3.htm but I'm far from clear about what column's what. The installation is: tails 25mm^2 earthing TN-S No RCD Main bond conductor length 12m Install age: early 1980s Can someone explain the columns? thanks, NT |
#2
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Test, ignore
On Sep 29, 11:40*pm, Tabby wrote:
I need to know what conductor size I must use to meet 17th edition. I found a table athttp://www.tlc-direct.co.uk/Book/5.4.3.htm but I'm far from clear about what column's what. The installation is: tails 25mm^2 earthing TN-S No RCD Main bond conductor length 12m Install age: early 1980s Can someone explain the columns? thanks, NT silly me should have checked the wiki! |
#3
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Main equipotential bonding
"Bay Man" wrote in message ... My supply has the earth supply clamped from the around the outer sheath of the main cable from the street. What is that? TN-S? Yes. And the Ze figure should be 0.8 ohms Regards Bruce |
#4
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Main equipotential bonding
On Oct 1, 10:53*am, "BruceB" wrote:
"Bay Man" wrote in message ... My supply has the earth supply clamped from the around the outer sheath of the main cable from the street. *What is that? *TN-S? Yes. *And the Ze figure should be 0.8 ohms Regards Bruce Thanks. Pardon my ignorance, what is Ze? |
#5
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Main equipotential bonding
"Bay Man" wrote in message ... On Oct 1, 10:53 am, "BruceB" wrote: "Bay Man" wrote in message ... My supply has the earth supply clamped from the around the outer sheath of the main cable from the street. What is that? TN-S? Yes. And the Ze figure should be 0.8 ohms Regards Bruce Thanks. Pardon my ignorance, what is Ze? Ze - External earth loop impedance. If you do not know about Ze or have the equipment to measure it do not worry. Do not try to measure with a standard multimeter! I mentioned it because it is of course possible that although connected in your house, there has at some time in the past been a repair in the street that has changed the cable type so that in reality your earth is connected to nothing much. Regards Bruce |
#6
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Main equipotential bonding
On Oct 1, 11:05*am, "BruceB" wrote:
"Bay Man" wrote in message ... On Oct 1, 10:53 am, "BruceB" wrote: "Bay Man" wrote in message .... My supply has the earth supply clamped from the around the outer sheath of the main cable from the street. *What is that? *TN-S? Yes. *And the Ze figure should be 0.8 ohms Regards Bruce Thanks. Pardon my ignorance, what is Ze? Ze - External earth loop impedance. If you do not know about Ze or have the equipment to measure it do not worry. *Do not try to measure with a standard multimeter! I mentioned it because it is of course possible that although connected in your house, there has at some time in the past been a repair in the street that has changed the cable type so that in reality your earth is connected to nothing much. Regards Bruce Bruce, thanks. Are you saying there is no earthing? I assumed the earth was the metal sheath around the L&N coming in from the street. You me worried. |
#7
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Main equipotential bonding
"Bay Man" wrote in message ... On Oct 1, 11:05 am, "BruceB" wrote: "Bay Man" wrote in message ... On Oct 1, 10:53 am, "BruceB" wrote: "Bay Man" wrote in message ... My supply has the earth supply clamped from the around the outer sheath of the main cable from the street. What is that? TN-S? Yes. And the Ze figure should be 0.8 ohms Regards Bruce Thanks. Pardon my ignorance, what is Ze? Ze - External earth loop impedance. If you do not know about Ze or have the equipment to measure it do not worry. Do not try to measure with a standard multimeter! I mentioned it because it is of course possible that although connected in your house, there has at some time in the past been a repair in the street that has changed the cable type so that in reality your earth is connected to nothing much. Regards Bruce Bruce, thanks. Are you saying there is no earthing? I assumed the earth was the metal sheath around the L&N coming in from the street. You me worried. Sorry, I am not trying to confuse or worry you, just being a bit pedantic in my reply. As I tried to say, the simple answer to your question is YES it is TN-S. However I was just pointing out that it is more complex than that to say you have a properly functioning TN-S earth. It is probably fine, but takes specialist equipment to check. Are you asking out of interest or because you have concerns about your installation? Regards Bruce |
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