EDF coming to connect new meter at temporary site.

[tom20]

Looking for some technical advice Regarding having EDF coming to connect a new Meter for a (3yr) Temporary TT System supply.

The connection was refused at first and he left a sheet with 2 points.

1. "earth rod" - (this has been sorted now) I've installed an earth rod with clamp and 16mm earth to the MET block.

2. "RCD REQD (Circuits)"


Now regarding point 2 - The main CCU has all RCBO's. But the CCU is contained in a separate box 2M's away. Im wondering if he didnt bother to look in here, or if he is wanting a main RCD between the meter and the CCU?


I was wondering if someone can guide me into make the setup perfect so that there is no risk of the guy form EDF leaving again.


A little detail into the diagram to help you visualize:

From the head there are unconnected meter tails to a henley block, and from the henley block to a 100A fused main switch. then from there to a connection box where the Tails will connect to the SWA. And from that SWA it goes undeground 2 meters to a wylex CCU with RCBO protection.

Thanks in advance
Tom

 

[Rampantchilli]

You need Rcd protection for the sub main to the ccu, it sounds like to me anyway

 

[telectrix]

if the tails are not buried, no need for RCD. a bit more detail would help. along with a photo or 2.

 

[ChrisElectrical88]

What earth rod setup did you go for? Just out of intrest?

 

[tom20]

It's just an Earth Rod in the ground with clamp. I shall get some photos to make it easier to understand.

 

[telectrix]

hope it's not one of them thin 3ft. twigs. you need at least 2 5/8" coupled rods, preferably 3. go deep, as the actress said to the bishop.

 

[HandySparks]

You need Rcd protection for the sub main to the ccu, it sounds like to me anyway

I'd agree with that. Without an RCD at the supply end, you don't have any earth fault protection for your SWA (unless the TT rod has a VERY low Ra). The upfront RCD could be 100mA, S type. I'm sure someone will correct me if I'm wrong here.

 

[tom20]

Yea i have a 5/8" Rod. But do you think they will reject it if its only the one?

And what would people suggestions be to main RCD unit? just a standard standalone self unit after the fused main switch?

 

[HandySparks]

Yea i have a 5/8" Rod. But do you think they will reject it if its only the one?

No, provided that the Ra achieved complies with the regs.

And what would people suggestions be to main RCD unit? just a standard standalone self unit after the fused main switch?

Yes, that will do. Something like this:
100 Amp 100mA Time Delayed RCD 2 Pole - Wylex