Question about earthing on TT system

[bernie4253]

In France, for swimming pools with fibreglass shell, there is an earthing requirement which necessitates an earth point on one of the water pipes to the pool pump. As the systems are TT, this means an earth spike near the pump. However, the supply for the pump also requires an earth and they cannot use a common earth. They cannot be on the same earth spike and the spike for the pump must be a minimum of 6 meters from the pool spike. The pump can use the main earthing point from the CU providing it is more than 6 meters away from the pool earth.

I wonder if anyone can give me an explanation of the need for separation?

 

[johnb2713]

I would have thought for isolation, if they used a common spike or a spike close together one spike / earth fault could introduce voltage to the other.

 

[kerching]

No idea …..<<insert Gallic shrug here>>

 

[Geoff1946]

I would have expected the pool-water pipes to be plastic (?)

 

[binky]

French electrics are somewhat different to ours, they don't have earths in the cables for a start, so I would not want to guess at the reasons for the rod arrangements, but definetly comply with it. The link below is a guide to installing multiple rods, albeit connected, for the UK. https://electrical.theiet.org/media/1659/multiple-earth-electrodes-in-a-tt-system-for-a-dwelling.pdf