Hi all,

I'm doing some work on a house with a pool, which has its own ccu about 20 meters from the main board. It currently doesn't have a main earth from the supply. Obviously this means I need to run a 16mm earth back to the supply, with the only option being an outdoor run along an exterior wall. There are lots of drainpipes etc so Id like to avoid running conduit. Does anyone know of what type of cable I can run, ie can you get single core 16mm tuff flex. Any ideas would be greatfully appreciated.
 
Are you sure it's not been installed as a TT system as it's a swimming pool???

What type of earthing system is in the house???

I would be looking to install a rod and make it a TT if not already, particularly if the house is TN-C-S.
 
Good point Lenny! Yeah, an earth rod would work. At the moment only the water supply is bonded which is where it is getting its earth from. The reading was ok, but obviously not up to 17th. It is a TNCS, why would you especially put a TT if its TNCS?

Thanks
 
Well most DNO's wont allow the exportation of a TN-C-S system to a swimming pool installation due to the risks that are present should the neutral conductor go "open circuit".

I've always TT'd any sort of pool install, much safer IMO.


Found this a while back.....has a lot of garb on swimming pools.......the reg numbers refer to the 16th ed though.


(i) Swimming pools employ a zonal concept which influences the methods available for protection against electric shock. Thus the methods employed in the dwelling may be unacceptable for the pool areas.
Careful consideration of the extent of the zones would be required before stipulating the type and location of electrical equipment.
SELV is recognised in the common Part 4 of BS7671 as providing protection against both direct and indirect contact, however, 602 requires the additional precaution of barriers and enclosures or insulation.
SELV with an open circuit voltage not exceeding 12v is the only recognised method in zones A and B. Exceptions to this requirement are extended to floodlights providing they are individually served by a dedicated transformer with an open circuit secondary voltage not exceeding 18v and to rcd-protected socket outlets with certain provisos.
Supplementary bonding is required to connect extraneous conductive parts with the protective conductors of all exposed conductive parts in Zones A,B and C. Further, it would be recommended to consider the benefits of a metal floor grid connected to the local supplementary bonding, especially if the PME earthing system was being considered as being extended to the pool area.
Generally, DNOs would not provide a PME (TN-C-S) terminal for a swimming pool due to the possibility of diverted neutral currents or small potential differences due to the voltage drop along the supply neutral causing perceived shock problems. As with any extension to an electrical installation, the DNO should be notified, preferably in advance.
The recommendation here might be to treat the pool building as a separate TT installation and to install only suitably rated Class ii equipment.

(ii) Electrical equipment should be suitable for the external influences it might have to encounter. Particular IP requirements are made for equipment dependant upon the zone into which it is intended to be installed.

(iii) Surface wiring systems should be non-metallic in nature. Additionally, Zones A and B should not contain wiring systems for anything other than the electrical equipment in those zones. There is also a requirement that accessible metal junction boxes should not be used in zone A and B.

(iv) Switchgear, controlgear and accessories are not permitted in Zones A and B except for socket outlets complying with BSEN 60309-2 which may be installed in Zone B providing they are protected by a 30ma rcd or by electrical separation and are 0.3m above the floor and 1.25m from the boarder of Zone A.
Regulation 602-07-02 sets out similar requirements for sockets, switches and accessories in zone C.

(v) The electric underfloor heating should comprise a metallic sheath or otherwise be covered by an earthed metallic grid. In both circumstances the sheath or grid should be connected to the local supplementary bonding.
 
Last edited by a moderator:

OFFICIAL SPONSORS

Electrical Goods - Electrical Tools - Brand Names Electrician Courses Green Electrical Goods PCB Way Electrical Goods - Electrical Tools - Brand Names Pushfit Wire Connectors Electric Underfloor Heating Electrician Courses
These Official Forum Sponsors May Provide Discounts to Regular Forum Members - If you would like to sponsor us then CLICK HERE and post a thread with who you are, and we'll send you some stats etc

Advert

Daily, weekly or monthly email

Thread starter

Joined
Location
Surrey

Thread Information

Title
Single core 16mm to run outdoors
Prefix
N/A
Forum
Australia
Start date
Last reply date
Replies
3
Unsolved
--

Advert

Thread statistics

Created
Jon Bridges,
Last reply from
Guest123,
Replies
3
Views
1,791

Advert

Back
Top