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[ElectriciansForums.net] MCBs on.. But still power?


Hello all,

I've searched the forum before asking but coming up empty handed??

I have a power cut from earlier. Live in a flat with a joined kitchen / living room and heard a bang from around the boiler area, then darkness.

Checked the CB's and had 2 tripped which were "B circuits" and lighting. The main 100A MCB was still in, but no power anywhere in the flat.

I've put both CB's back in and still nothing. I have no CB's off now but still the flat is dead. Checked with neighbours as I thought maybe it was the supply and we were all down but they're good. So MCB in and subsequent CB's in but still nothing... Can anyone please advise?
 
Hi @enpassant just to while a few minutes away while you are there candle in hand awaiting succour, En Passant, I am teaching my grandsons chess and was trying to remember exactly how the En Passant rule worked, do you know?
I used to use the en passant move as it's surprisingly poorly known and understood. Unfortunately I can't recall the exact details of when it can be used so don't want to advise incorrectly, but from memory a pawn moves diagonally and captures an adjacent piece which in a square which it never occupies.
 
T’is a great game, Chess, though not so when your nephew beats you when he’s 6 years old! Still, he’s working in Tesco now so I guess he’s the pawn!
(I love him very much by the way)
 
Cheers for the replies guys.

Expect his batteries gone flat by now.

Yep. I used a battery pack to charge it but you guessed it... I hadn't charged that so it died too, without fully charging my phone.


Haha, thanks. Might need to try it next time.

Hi @enpassant just to while a few minutes away while you are there candle in hand awaiting succour, En Passant, I am teaching my grandsons chess and was trying to remember exactly how the En Passant rule worked, do you know?

Seems there's some interest in the thread as it's turned into a chess thread instead

en passant is French for in passing, it's a basic move, applicable only for the first move of a pawn.

If your pawn is moving towards enemy lines (5th, as someone else mentioned) then your opponent moves their pawn 2 spaces (only applicable if it's that pawns first move) from the 7th to the 5th, it's now adjacent to you - "preventing" you from capturing it like if it had move a single space.

En passant allows you to capture the pawn by moving to the space the pawn would have taken, if it had moved a single space instead.
 
either its check or check mate for the op ,no lecky .

Bravo!

Electrician came out and went down to the locked cupboard, presumably the meters for the block and voila, power again.

Wasn't overly confident in him, weird character and I think English was his third or fourth language!

Opened up the box, took a picture in his phone and out it back together again.

Everything was fine again, had power yesterday then wake up this morning and the same 2 CB's are tripped as before, but not the full flat this time. So, lights and "sockets B", with the fridge and boiler off again. This time whilst we were asleep, but can see outside its been raining last night so again, I'm thinking maybe the boiler and somehow water is coming down the flue???
 
Bravo!

Electrician came out and went down to the locked cupboard, presumably the meters for the block and voila, power again.

Wasn't overly confident in him, weird character and I think English was his third or fourth language!

Opened up the box, took a picture in his phone and out it back together again.

Everything was fine again, had power yesterday then wake up this morning and the same 2 CB's are tripped as before, but not the full flat this time. So, lights and "sockets B", with the fridge and boiler off again. This time whilst we were asleep, but can see outside its been raining last night so again, I'm thinking maybe the boiler and somehow water is coming down the flue???
so what tripped last nite? was it in the flat or in the meter box?
 
Well of course that is the issue, what made the main fuse go and not the local fuse first. Something is wrong there as we are required to design circuits that are selective in order of distance upstream/downstream so the local protection should go first. This is where you need an electrician to investigate and remedy that problem.
 
Telectrix, the same two breakers as in the picture I attached to the OP - at the box, in the flat. It's lights and "circuits B" (not "sockets B" as I wrote in my last post.)

Not sure exactly what "circuits B" includes, but seems to be the boiler and fridge and not the cooker.

Well of course that is the issue, what made the main fuse go and not the local fuse first. Something is wrong there as we are required to design circuits that are selective in order of distance upstream/downstream so the local protection should go first. This is where you need an electrician to investigate and remedy that problem.

On the first night, yeah, but last night the local has tripped as it's at the box in the flat.

It seems strange to me that both the "circuit B" and lights go, but just one or the other?
 
hangon.. is it the 2 MCBs that tripped, or the RCD ( next to them, with the yellow test button)? if it was that, it could be that the upstream fuse/MCB tripping could have caused that the first time round.
 

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