Caravan park Earthing

[Bradley6969]

Is TNS permitted on caravan site? I always thought you could use as TNS as supply cable then TT each pitch, spark I’m working with says you can use TNS all way through if ZS is acceptable
Thanks

 

[Deleted member 26818]

ESQCR are does NOT allow pme conditions to a static caravan! It does allow it for buildings on parks, not the vans themselves

Here is a quote from BS7430 (earthing Code of Practice):

"NOTE Residential caravans which are not normally intended to be moved from a caravan park are regarded as permanent buildings."

 

[Nigel]

Here we go.
Just because the supply to the installation is TN-S, doesn’t mean PME conditions do not apply.
It’s why BS7671 states “where PME conditions apply”, rather than saying “where the earthing system is TN-C-S”.

Yes ESQCR does prohibit the use of PME for Caravan pitches.
However it does not prohibit the use of PME for static Caravans or for other permanent structures on Caravan sites.

If it is as you put it ‘A TN-S with PME conditions’ then it is not a TB-S is it?

It is up the the DNO to ensure their supply arrangement is vlear nit for us to go around asking questions.

 

[Nigel]

Here is a quote from BS7430 (earthing Code of Practice):

"NOTE Residential caravans which are not normally intended to be moved from a caravan park are regarded as permanent buildings."

Regardless, BS7671 is clear that a PME cannot be used.

 

[Deleted member 26818]

Not sure what TB-S is?

 

[Deleted member 26818]

Regardless, BS7671 is clear that a PME cannot be used.

No, it’s not.
From BS7671 Definitions:
Caravan. A trailer leisure accommodation vehicle, used for touring, designed to meet the requirements for the construction and use of road vehicles (see also definitions of Motor caravan and Leisure accommodation vehicle).

 

[Nigel]

No, it’s not.

Crystal clear.

 

[Jim_e_Jib]

Not sure what TB-S is?

Well, the B and N are next to each other on a keyboard, so...

 

[Deleted member 26818]

Crystal clear.

ESQCR allows the use of PME on caravan sites for permanent buildings.
BS 7430, the earthing Code Of Practice that the DNOs’ use, states static caravans are regarded as permanent buildings.

 

[Deleted member 26818]

I am having a strong sense of deja vu here.
Seems I had a similar discussion back in 2010 on another forum.

 

[Deleted member 26818]

If it is as you put it ‘A TN-S with PME conditions’ then it is not a TN-S is it?

It is up the the DNO to ensure their supply arrangement is clear not for us to go around asking questions.

If it’s not TN-S then fine.
Won’t ever need a DNO to come out and convert a TN-S supply to TN-C-S.

I won’t bother pointing out, that BS7671 states we can obtain information regarding the characteristics of a supply by enquiry.
Or that ESQCR requires DNOs to supply such information upon request.

 

[Nigel]

ESQCR allows the use of PME on caravan sites for permanent buildings.
BS 7430, the earthing Code Of Practice that the DNOs’ use, states static caravans are regarded as permanent buildings.

Like I said BS7671 dors not so if you do you are not following BS7671. Very simple.

 

[Deleted member 26818]

Like I said BS7671 dors not so if you do you are not following BS7671. Very simple.

Actually, it does:
708.411.4 TN system
The Electricity Safety, Quality and Continuity Regulations (ESQCR) prohibit the connection of a PME earthing facility to any metalwork in a leisure accommodation vehicle (including a caravan).
This does not preclude the use of a PME earthing facility as the means of earthing for other purposes, such as to the installations of permanent buildings.
NOTE: The requirements of other sections of Part 7 may also apply.

 

[richy3333]

TB-S = Earth Bullsheet - supplier side?

Dont feed the trolls

 

[bigspark17]

Actually, it does:
708.411.4 TN system
The Electricity Safety, Quality and Continuity Regulations (ESQCR) prohibit the connection of a PME earthing facility to any metalwork in a leisure accommodation vehicle (including a caravan).
This does not preclude the use of a PME earthing facility as the means of earthing for other purposes, such as to the installations of permanent buildings.
NOTE: The requirements of other sections of Part 7 may also apply.

So what i said earlier then!!!

 

[Deleted member 26818]

So what i said earlier then!!!

No not really.
You said ESQCR does NOT allow PME conditions to a static caravan! It does allow it for buildings on parks, not the vans themselves”
BS7671 does not define a static caravan as being a caravan.
It only defines touring caravans as being caravans.
Also, BS7430 which is the earthing COP used by the DNO, considers static caravans as being permanent buildings.

That being said, it doesn’t preclude the DNO from refusing a PME connection to a static caravan, on safety grounds, due to the metal skin.

Of course, all this has nothing to do with the OP’s question regarding whether TN-S can be used throughout a caravan site.
The simple answer being yes.
The proviso being that it should be determined first, whether PME conditions apply.
If PME conditions do apply and the site caters to touring caravans, the hook ups would have to be TT.