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7CCFD03E-505D-4F8B-96E8-C012F545363F.jpeg 8A23B480-9127-42C9-B7E1-FE99749B7676.jpeg B87E32B5-F3F3-4112-B7F5-6F58CF0CD38C.jpeg 6A11A3F8-F3BE-4BE4-9C67-CE780ED7ECCE.jpeg View attachment 48444 View attachment 48445 View attachment 48444 View attachment 48445 View attachment 48446 View attachment 48447 Ok, I’m a relatively new domestic installer and would value the opinions from you more experienced guys.

Went to look at a job which was outside lighting, gate lights, drive lights, security etc and changing some fluorescents for down lighters in an outbuilding... straightforward. When I went to check the DB to see what I would be working with I came across this arrangement... the client is very keen to get it all upgraded and looking at what he’s got DB1 (top board) feeds DB2 (no RCDS) both boards then feed an outbuilding each with sockets, lighting and EV charger off one... no bonding to gas, water etc and on and on we go , I’m not surprised he wants / needs it sorting.

So, I’m thinking split the incoming tails in a Henley and replace DB1 and 2 with 2 x new 12 way split boards (couple of spare ways in each for future use) and each one of those then feeds a sub board in the outbuildings. Remove the fuses for other two phases not used.

OR, as he’s got 3 phase coming in use 1 phase for one new DB and another phase for another DB,?

I’m more comfortable with option one but open to suggestions. I’m going back on Saturday afternoon to have a more thorough investigation but that’s my thoughts so far...

Sorry, if I don’t respond quickly but got to take my dear old mum out for lunch as she’s 90 today!
 
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Wilko

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Another fine installation :)
Starting thought is to be wary of IR faults and do plenty of testing prior to replacing anything. I'm not MIC expert, but this may be a problem (?).

IMG_1392.jpg
 

littlespark

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Advent Win
I'm not MIC expert, but this may be a problem (?).
Is that MICC, or a couple of microbore heating pipes?


OP:- Happy birthday to your mum. Not too much gin, ok

Are you sure that's a domestic installation?
Could take more than a week to sort all that out. I would try to share load over all 3 phases, assuming there's no underlying problems with the installation itself. (borrowed neutrals for example)
What does the timeclock control? off peak heating?

Good luck.
 

davesparks

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Mentor
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How is the installation distributed across the phases at the moment?

You ideally need to achieve some kind of balance across the phases as far as practicable.
 

Top Cat

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Not sure I understand you when you say about only using 1 phase. I see two 3 phase boards in the photo's, what are they feeding?
The time clock looks to be a DNO off-peak time clock, do they have storage heaters. I see what looks like a contactor so again, storage heaters? Also not sure about you removing the DNO fuses!
As you say you are a relatively new domestic installer I wonder if you knew an experienced spark to have a look with you? This set up is nearer to commercial than domestic so you could get in over your head if you're not careful.
 
  • Thread Starter Thread Starter
  • #8
Yes, one house and domestic.

The 3 phase is not needed or in use but it is live up to the isolator switch. That’s why I thought get rid of it all after the DNO removes the fuses then I’m just dealing with one dogs dinner of a single phase installation...

I agree some serious testing is needed.

I think I will go back with a more experienced sparks and see what they think, maybe hand it off to them or hopefully work with them, nice learning curve!

That’s why I posted as I don’t want to get in over my head.
 
If you can make the 3 phase redundant (is this possible are there any 3 phase devices anywhere) then dealing with the rats nest becomes much easier to deal with.
2 things first ...
1 - get the dno to give you a cost on a new single phase supply and brand new isolation point
2 - do a thorough eicr on the whole installation, don’t cut corners on the eicr testing as it will only bite you in the arse when you start putting everything on an rcd.

This is the sort of job I love if you have the budget and time to rip the whole lot out and make a really nice job of it
 
  • Thread Starter Thread Starter
  • #10
No 3 phase devices

Good shout on DNO single phase / isolation point
 
  • Thread Starter Thread Starter
  • #11
Is that MICC, or a couple of microbore heating pipes?


OP:- Happy birthday to your mum. Not too much gin, ok

Are you sure that's a domestic installation?
Could take more than a week to sort all that out. I would try to share load over all 3 phases, assuming there's no underlying problems with the installation itself. (borrowed neutrals for example)
What does the timeclock control? off peak heating?

Good luck.

Microbore
 
It's possible the 3 phase supply was required for max demand, rather than needing 3 phases for 3 phase kit. If it's a big house with all electric space heating that might have been the reason. It's unusual to find a 3 phase head in domestic unless it needs to be there for extra kW. Worth checking max demand before getting supply changed....
 
Ditching the three phase supply for a single phase option seems crazy to me. It needs a thorough inspection and test to ascertain what and what isn't still required you can then rationalise it all into one TP&N board with a single phase off peak unit if required.
 
I suspect the Federal triple pole board is the off peak judging from some of the circuit ID and the separate Federal mcb below the contactor enclosure which appears to be in the off position.
 
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