Is this meter redundant?

[timhoward]

I've just been sent this, not been there yet. At least 2 new circuits needed and things are a little.....tight...!
Hager board is 10 modules and full. RCD main switch.
They reckon they have an earth rod outside, deciphering connections to left of the head will need better photo. So earthing details TBC.

I'm trying to decide if I even try to change that board - yet another Hager with main switch RCD, as I could add a new CU elsewhere.

But main question - am I thinking straight regarding this (unsealed) meter - and that it looks like it might be redundant?
If it were it opens up some options for a bigger CU.

 

[SparkySy]

551.7.2 is basically saying that the PV system should be on its own circuit that then feeds the final circuits for the installation, so not dogged in with the ring final or cooker circuit.

The earth afaik is fine on the TNC-S system, well ours is but I'm a bit rusty as it was about 8 years ago when I last did any PV installation. I got sick of paying MCS and for two inspections a year!

551.7.2 iii I think I agree with @pc1966 deciphering.
Can't see a problem with not using RCD protection for the supply if its in conduit and surface especially if the MI don't specifically ask for one!
I'm sure when I fitted PV the AC isolator was before the meter but that may have changed.
Sounds like the new set up will be much better and I agree with your concerns with the PV and final circuits all on 1 RCD and the inverter shut down time. Having said that most will shut down the AC side pretty Quickly in the event of mains supply failure.
Sy

 

[timhoward]

Thanks Sy.

Can't see a problem with not using RCD protection for the supply if its in conduit and surface especially if the MI don't specifically ask for one!

Nor can I - the main issue is a purely practical one.
I'm sure something I read somewhere requires a 2 pole isolator near the origin, even if there's another isolator by the inverter outside. Even if not, I'd like it to have this to satisfy my internal philosophy of how it should be installed!

An RCBO does that nicely in a 1 module format. An MCB would need another isolator to disconnect the Neutral.
This job is going to be enough of a fight without adding extra gear to that cupboard!

 

[pc1966]

I'm sure something I read somewhere requires a 2 pole isolator near the origin, even if there's another isolator by the inverter outside. Even if not, I'd like it to have this to satisfy my internal philosophy of how it should be installed!

Having switched neutral on RCBOs is just such a good thing to have anyway. For TT with up-front RCD it allows proper selectivity against N-E faults, and even for TN where this is not an issue it makes IR testing easier as you can isolate complete circuits to locate any dodgy low global IR result very simply.