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Default 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
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Default 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!
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Default 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

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Default 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?
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Default 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



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Default 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.
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Default 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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