About 12 years ago when I installed my electric shower I did all the plumbing
and cabling and got Scottish power ( It was SSEB then ) to do the final
connection .The guy came and did the job but commented to add an additonal earth
cable from the shower to the CH radiator and then back to the Scottish Power
earth terminal beside the consumer unit . This I did and it has remained that
way ever since .

I have just replaced my shower with a 10.5 one and was unable to get the circuit
earth and this extra earth cable in to the cable connector ( The previous shower
had a stud and nut connection arrangement ) so I have left out the additional
earth between the earth and the radiator . It set me thinking why this extra
earth was necessary in the first place and also about the earth from the
radiator as well. Should I leave things as they were before ( Using thinner
earth cable betweeen shower and radiator to allow it to get in to the connector)
or what does anyone suggest ?


Stuart

Stuart was thinking very hard :
It set me thinking why this extra
earth was necessary in the first place and also about the earth from the
radiator as well. Should I leave things as they were before ( Using thinner
earth cable betweeen shower and radiator to allow it to get in to the
connector)
or what does anyone suggest ?

The idea is to ensure that all metalwork is at the same electrical
potential. All taps, baths, sinks, radiators, towel rails, metal pipes
and etc. should be bonded to a common earth.

--

Regards,
Harry (M1BYT) (L)
http://www.ukradioamateur.co.uk

Harry Bloomfield verbally sodomised in
:

Stuart was thinking very hard :
It set me thinking why this extra
earth was necessary in the first place and also about the earth from
the radiator as well. Should I leave things as they were before (
Using thinner earth cable betweeen shower and radiator to allow it to
get in to the connector)
or what does anyone suggest ?

The idea is to ensure that all metalwork is at the same electrical
potential. All taps, baths, sinks, radiators, towel rails, metal pipes
and etc. should be bonded to a common earth.


How many earths are there?

--
Phil Kyle™

T
h i
i s
s l
f i l
S o n o
i u e n
g r s g

On Sat, 30 Dec 2006 20:23:06 GMT, Harry Bloomfield
wrote:

Stuart was thinking very hard :
It set me thinking why this extra
earth was necessary in the first place and also about the earth from the
radiator as well. Should I leave things as they were before ( Using thinner
earth cable betweeen shower and radiator to allow it to get in to the
connector)
or what does anyone suggest ?

The idea is to ensure that all metalwork is at the same electrical
potential. All taps, baths, sinks, radiators, towel rails, metal pipes
and etc. should be bonded to a common earth.

Ok..so it seems you are saying I should return the arrangement to how it was
before with the shower being connected to the radiator then to the Scottish
Power earth point but there is the confusion caused by the part plastic ,part
copper plumbing to the bath/basin /toilet .

Stuart .

"Harry Bloomfield" wrote in message
...
Stuart was thinking very hard :
It set me thinking why this extra
earth was necessary in the first place and also about the earth from the
radiator as well. Should I leave things as they were before ( Using
thinner
earth cable betweeen shower and radiator to allow it to get in to the
connector)
or what does anyone suggest ?

The idea is to ensure that all metalwork is at the same electrical
potential. All taps, baths, sinks, radiators, towel rails, metal pipes and
etc. should be bonded to a common earth.

And all class I and II electrical equipment. No need to bond taps though.
Although supplementary bonding will almost certainly result in the bonding
cable been at earth voltage due to a light fitting, shower or a radiator etc
there is no need to take the cable back to the earth busbar in the CU.

Generally the smallest bonding cable you can use is 4mm^2

Adam

Stuart wrote:

About 12 years ago when I installed my electric shower I did all the plumbing
and cabling and got Scottish power ( It was SSEB then ) to do the final
connection .The guy came and did the job but commented to add an additonal earth
cable from the shower to the CH radiator and then back to the Scottish Power
earth terminal beside the consumer unit . This I did and it has remained that
way ever since .

I have just replaced my shower with a 10.5 one and was unable to get the circuit
earth and this extra earth cable in to the cable connector ( The previous shower
had a stud and nut connection arrangement ) so I have left out the additional
earth between the earth and the radiator . It set me thinking why this extra
earth was necessary in the first place and also about the earth from the
radiator as well.

The short answer is that it wasn't.

Should I leave things as they were before ( Using thinner
earth cable betweeen shower and radiator to allow it to get in to the connector)
or what does anyone suggest ?

You need to ensure that the equipotential bonding in the room is
present, however there is no need for a discrete connection back to the
CUs main earth terminal (although since you would usually include the
CPCs (i.e. earth wires) of any circuits delivering power into the
bathroom in the equipotential bonding then you will in effect get this
via a fortuitous route)

--
Cheers,

John.

/================================================== ===============\
| Internode Ltd - http://www.internode.co.uk |
|-----------------------------------------------------------------|
| John Rumm - john(at)internode(dot)co(dot)uk |
\================================================= ================/

"John Rumm" wrote in message
...
Stuart wrote:

About 12 years ago when I installed my electric shower I did all the
plumbing
and cabling and got Scottish power ( It was SSEB then ) to do the final
connection .The guy came and did the job but commented to add an
additonal earth
cable from the shower to the CH radiator and then back to the Scottish
Power
earth terminal beside the consumer unit . This I did and it has remained
that
way ever since .

I have just replaced my shower with a 10.5 one and was unable to get the
circuit
earth and this extra earth cable in to the cable connector ( The previous
shower
had a stud and nut connection arrangement ) so I have left out the
additional
earth between the earth and the radiator . It set me thinking why this
extra
earth was necessary in the first place and also about the earth from the
radiator as well.

The short answer is that it wasn't.

Should I leave things as they were before ( Using thinner
earth cable betweeen shower and radiator to allow it to get in to the
connector)
or what does anyone suggest ?

You need to ensure that the equipotential bonding in the room is present,
however there is no need for a discrete connection back to the CUs main
earth terminal (although since you would usually include the CPCs (i.e.
earth wires) of any circuits delivering power into the bathroom in the
equipotential bonding then you will in effect get this via a fortuitous
route)

--
Cheers,

John.

/================================================== ===============\
| Internode Ltd - http://www.internode.co.uk |
|-----------------------------------------------------------------|
| John Rumm - john(at)internode(dot)co(dot)uk |
\================================================= ================/

this may be of some help
http://www.niceic.org.uk/downloads/P...0Guide%202.pdf you need to
connect all earth terminals in the zones together along with metal pipe
work, metal bath and any radiator fed with metal pipes, dont run cable back
to mains, this isnt about introducing earth potential but creating a
faradays cage so all metal work will be at same potential. If your in
England this is under part p of building regs and is a legal requirement to
notify the local authority so is swapping a shower in a bathroom.....is your
cable and pull switch up to the job (current) of the new shower?

"John Rumm" wrote in message
...
Stuart wrote:

About 12 years ago when I installed my electric shower I did all the
plumbing
and cabling and got Scottish power ( It was SSEB then ) to do the final
connection .The guy came and did the job but commented to add an
additonal earth
cable from the shower to the CH radiator and then back to the Scottish
Power
earth terminal beside the consumer unit . This I did and it has remained
that
way ever since .

I have just replaced my shower with a 10.5 one and was unable to get the
circuit
earth and this extra earth cable in to the cable connector ( The previous
shower
had a stud and nut connection arrangement ) so I have left out the
additional
earth between the earth and the radiator . It set me thinking why this
extra
earth was necessary in the first place and also about the earth from the
radiator as well.

The short answer is that it wasn't.

Should I leave things as they were before ( Using thinner
earth cable betweeen shower and radiator to allow it to get in to the
connector)
or what does anyone suggest ?

You need to ensure that the equipotential bonding in the room is present,
however there is no need for a discrete connection back to the CUs main
earth terminal (although since you would usually include the CPCs (i.e.
earth wires) of any circuits delivering power into the bathroom in the
equipotential bonding then you will in effect get this via a fortuitous
route)

--
Cheers,

John.

/================================================== ===============\
| Internode Ltd - http://www.internode.co.uk |
|-----------------------------------------------------------------|
| John Rumm - john(at)internode(dot)co(dot)uk |
\================================================= ================/

On Sun, 31 Dec 2006 17:05:46 -0000, "j*" nospam@nospam wrote:

this may be of some help
http://www.niceic.org.uk/downloads/P...0Guide%202.pdf you need to
connect all earth terminals in the zones together along with metal pipe
work, metal bath and any radiator fed with metal pipes, dont run cable back
to mains, this isnt about introducing earth potential but creating a
faradays cage so all metal work will be at same potential. If your in
England this is under part p of building regs and is a legal requirement to
notify the local authority so is swapping a shower in a bathroom.....is your
cable and pull switch up to the job (current) of the new shower?

I am not in England .

The new shower pull switch and cable (10mm) are both suitable for the job .

All I was really wanting to know was about the instruction all those years ago
to add in a seperate earth from shower to radiator to Sc Powers earth connection
.. The shower obviously has an earth connection via the supply cable so I
couldn't see why an "extra" earth was necessary ( excluding the radiator as
that's a seperate issue ).

Thx for the link .
I'll probably get a sparks in after the hols to check over the bonding as it's
all Greeek to me despite having read about it and the use of part copper part
plastic just confuses the issue .
Stuart

old regs

"Stuart" wrote in message
...
On Sun, 31 Dec 2006 17:05:46 -0000, "j*" nospam@nospam wrote:

this may be of some help
http://www.niceic.org.uk/downloads/P...0Guide%202.pdf you need to
connect all earth terminals in the zones together along with metal pipe
work, metal bath and any radiator fed with metal pipes, dont run cable
back
to mains, this isnt about introducing earth potential but creating a
faradays cage so all metal work will be at same potential. If your in
England this is under part p of building regs and is a legal requirement
to
notify the local authority so is swapping a shower in a bathroom.....is
your
cable and pull switch up to the job (current) of the new shower?

I am not in England .

The new shower pull switch and cable (10mm) are both suitable for the job
.

All I was really wanting to know was about the instruction all those years
ago
to add in a seperate earth from shower to radiator to Sc Powers earth
connection
. The shower obviously has an earth connection via the supply cable so I
couldn't see why an "extra" earth was necessary ( excluding the radiator
as
that's a seperate issue ).

Thx for the link .
I'll probably get a sparks in after the hols to check over the bonding as
it's
all Greeek to me despite having read about it and the use of part copper
part
plastic just confuses the issue .
Stuart

j* (aka -j ?) wrote:

in England this is under part p of building regs and is a legal
requirement to notify the local authority so is swapping a shower in
a bathroom

There is no requirement to notify in the case of a replacement which
does not involve altering the fixed wring or any protective switchgear.

--
Andy