Discuss Extending sub main cables? in the Electrical Wiring, Theories and Regulations area at ElectriciansForums.net

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Hi everyome

We're refurbing our lower ground flat within a Victorian terraced house, and there are 2 flats above.

Contractor has knocked out all relevant walls and found services running through what is to be open plan living room. So we need to relocate the service run to the flats above. Gas and water easy. Electrics need the cables extending. The contractor has said his electrician is't prepared to do the work as it involves extending the sub-main cable (3-phase?) which is not armoured cable. He says its a shifty thing to do.

Our electrician, who previously did a complex job to enable us to move all of our meters, and has already extended these cables once, is prepared to do it, using joint boxes accessible to the flats above, all installed in metal trunking. He will offer NICEIC certification, testing to all flats and minor works certificates.

We don't know what we should do. If we need to put in armoured cabling to the flats above then this will be v disruptive finding cable runs, e.g. pulling up floors etc. and then any follow on work required to ensure all fittings in the flats are working. And getting permission to do all this intrusive work will be difficult not to mention time consuming.

This situation must happen all the time in old buildings with a number of flats? Can you advise what would be acceptable? We were also thinking of contacting Building Control.

Thank you in advance :)
 
Hi everyome

We're refurbing our lower ground flat within a Victorian terraced house, and there are 2 flats above.

Contractor has knocked out all relevant walls and found services running through what is to be open plan living room. So we need to relocate the service run to the flats above. Gas and water easy. Electrics need the cables extending. The contractor has said his electrician is't prepared to do the work as it involves extending the sub-main cable (3-phase?) which is not armoured cable. He says its a shifty thing to do.

Our electrician, who previously did a complex job to enable us to move all of our meters, and has already extended these cables once, is prepared to do it, using joint boxes accessible to the flats above, all installed in metal trunking. He will offer NICEIC certification, testing to all flats and minor works certificates.

We don't know what we should do. If we need to put in armoured cabling to the flats above then this will be v disruptive finding cable runs, e.g. pulling up floors etc. and then any follow on work required to ensure all fittings in the flats are working. And getting permission to do all this intrusive work will be difficult not to mention time consuming.

This situation must happen all the time in old buildings with a number of flats? Can you advise what would be acceptable? We were also thinking of contacting Building Control.

Thank you in advance :)
Who owns the "Sub Main" you or the DNO Distribution Network Operator"?
 
Hi there - it't us - its the cables running from the meters / isolators / distribution board to the other flats. Electrician has called them sub main cables in the quote.
 
I'm lost, what is the actual question being asked here?
As far as I can see you have one electrician who doesn't want the job and another electrician who does, so what do you want to know from us?

In my opinion the best thing to do is replace the submains.
 
One says its shifty, the other says its fine - who is correct?!
Replacing the sub mains is difficult as would need to open up the cable runs in the other two flats potentially v. disruptive - we would prefer not to do this if the other way is safe and above board.
 
One says its shifty, the other says its fine - who is correct?!
Replacing the sub mains is difficult as would need to open up the cable runs in the other two flats potentially v. disruptive - we would prefer not to do this if the other way is safe and above board.
Personally I wouldn't want to be joining a 3 phase sub main, best replace it, if the gas and water was easy the cable should be a doddle imo that is.
 
Its a Victorian terraced house where the top floors have been converted into flats. I'd be surprised if a flat would require 3 phase.
The OP did put a question mark after mentioning 3 phase... Then again you never know.
 
Single or three still wouldn't want to be joining them.

Replacing would be better but extending them would still be ok, as long as it's done properly and to regs
 
We don't know what we should do. If we need to put in armoured cabling to the flats above then this will be v disruptive finding cable runs, e.g. pulling up floors etc. and then any follow on work required to ensure all fittings in the flats are working. And getting permission to do all this intrusive work will be difficult not to mention time consuming.
you should thought about that before any work is started.
 
I had a cable to move from a cafe with flat above this year due to complete refurb, in the end instead of routing it like a worm through the building and upstairs, i ran it up outside wall with metal capping covering the SWA just to be sure, ended up half the length, less time and cost. If other flats agree and aesthetics wouldnt be an issue, then maybe look into running it externally as much as possible.
 
One says its shifty, the other says its fine - who is correct?!
Replacing the sub mains is difficult as would need to open up the cable runs in the other two flats potentially v. disruptive - we would prefer not to do this if the other way is safe and above board.

Without knowing exactly how each intends to do the job it is very hard to say who is right.

Both replacing the cables and extending them could be done safely or could be done dangerously, it all depends on the method of doing it, competence of the person doing the work, the site conditions and the available budget.
 

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