Hot Tub

[Andy78]

No worries . Now best keep quite before they notice the thread !:30:

I think they have noticed, just don't know where to start. I certainly don't, and for that reason....I'm out.

 

[i=p/u]

Who's been watching the den

 

[Engineer54]

Check ze at out building , if it's under tt max ze then no u don't need another earth rod, two rcds is pointless, one at either end just make sure the swa mechanical protection is earthed

Lord give us strength!!!

 

[D Skelton]

I knew it wasn't gonna be long till you piped up Eng Let rip! Haha

 

[Deleted member 9648]

Hi Folks,
have been asked to remedy problems created by an 'electrician' who left his spurs and saddlebag in the understairs cupboard...
:cowboy:
Here is what there is:
Its a TT system
At the CU end is a 40A 30mA RCD, 4mm SWA run of approx 8 meters to outbuilding.
In the outbuilding a 63A 30mA RCD 2x 20A and 1x 6A mcbs.
One of the 20A mcb's feeds a 13A fused spur which has a length of 2.5mm flex intended for the hot tub connection.
The other is for sockets and the 6A is for lights.

My plan is to replace the 40A RCD with a 63A. Replace the 4mm SWA with 6mm (as per manufacturers info)
Put a 63A 100mA RCD in the outbuilding.
Replace the 20A mcb with a 32A and ditch the fused spur for a 32A rotary isolator.

Now my question is, do I need a separate earth for the outbuilding as the house is already TT? The earth spike is in the garden about 5 meters from the outbuilding and about 2 meters from the tub.

Edit.....post removed,probably a bit harsh.

 

[DaveVector]

Fair enough. I think I should of thought it through a bit more before posting my question. So I will today I will decide on the discrimination aspect, which came about partly due to previous 'electrician' installing the two RCD's.

Could I therefore get back to the original question, please.
Do I need another earth spike as main house TT spike is so close to the outbuilding/hot tub?

 

[shanky887614]

Fair enough. I think I should of thought it through a bit more before posting my question. So I will today I will decide on the discrimination aspect, which came about partly due to previous 'electrician' installing the two RCD's.

Could I therefore get back to the original question, please.
Do I need another earth spike as main house TT spike is so close to the outbuilding/hot tub?

Pick one up from wholesalers and test at sub board if you dont need it take it back

 

[Engineer54]

Fair enough. I think I should of thought it through a bit more before posting my question. So I will today I will decide on the discrimination aspect, which came about partly due to previous 'electrician' installing the two RCD's.

Could I therefore get back to the original question, please.
Do I need another earth spike as main house TT spike is so close to the outbuilding/hot tub?

So what is the current Ra value that you are seeing with the existing earth rod?? If it's a completely Naff value and/or gained from one of those thin 3/8'' twigs, then it would be better to replace altogether. If it's a decent sized rod that still has a viable screw thread, then couple another rod on to it. Or you can drive in another 2 X 1.2M coupled rod making sure you are at least 3 metres or more distant from the existing rod. Depth is the key to a good TT system, for both lowering Ra values and just as important for ensuring the TT systems stability...

I think others have brought up the other incorrect factors of your OP and by the sound of it, you seem to be in the process addressing them...

 

[i=p/u]

Or getting dressed and ready to start , now you have the confidence ...