60a main fuse upgrade

[Edward Currant]

Evening All

Ive got a residential house on a 60a cut out fuse being changed to a 6 bed HMO with 6x 8.5kw en-suite showers.
Im am waiting for a quote from the DNO about upgrading the supply from 60-100a.

I am thinking of useing 2x 3way Garo non priority sub DB's for the showers to reduce the loading so only 2x showers can be run at any one time.

I am hopeing that the DNO cable is man enough and its only a case of changing the fuse.

If not then i may as well get a 3ph supply and do away with the 2x Garo boards.

Any one got examples of cost differences between 1ph and 3ph cable upgrades ?
Im assuming it would then be a 3ph x 100a supply or do they do a 3ph x 60a

Any good ideas or tips very welcome

Much love

Eddie

 

[Dustydazzler]

I would ask the developer to get a price from the DNO to upgrade to a 3 phase supply

 

[Edward Currant]

I would ask the developer to get a price from the DNO to upgrade to a 3 phase supply

Yeah i am going to do that.

 

[Rockingit]

The costs are normally in the groudworks to replace the cable, not the cable itself, so there's limited difference 1ph to 3ph - BUT - be prepared for the DNO to use this as an excuse to claim they need to replace half the cables in the area to facilitate that extra 40 amps. I had this on a job last year - needed to move an intake a couple of meters, DNO 'young buck' surveyor came along and quoted £15k to the developer due to claiming to need to re-lay the whole street. I left it a couple of months and then made a fresh enquiry under my business instead, had a chat with the senior area DNO engineer on the phone, he 'popped to site for a coffee while passing' and the job got done two weeks later for minimum charge at £400ish

 

[brianmoooore]

The costs are normally in the groudworks to replace the cable, not the cable itself, so there's limited difference 1ph to 3ph - BUT - be prepared for the DNO to use this as an excuse to claim they need to replace half the cables in the area to facilitate that extra 40 amps. I had this on a job last year - needed to move an intake a couple of meters, DNO 'young buck' surveyor came along and quoted £15k to the developer due to claiming to need to re-lay the whole street. I left it a couple of months and then made a fresh enquiry under my business instead, had a chat with the senior area DNO engineer on the phone, he 'popped to site for a coffee while passing' and the job got done two weeks later for minimum charge at £400ish

I've long held the theory that DNO quotes are made by pulling random numbers out of a hat. I've asked for re quotes on several occasions, and, like for the above, it's difficult to believe they're quotes for the same job, as they vary so widely.
Last job I had quotes for on my own property went from free to £4000 to £3000 and finally back to free.

 

[David Prosser]

I've long held the theory that DNO quotes are made by pulling random numbers out of a hat. I've asked for re quotes on several occasions, and, like for the above, it's difficult to believe they're quotes for the same job, as they vary so widely.
Last job I had quotes for on my own property went from free to £4000 to £3000 and finally back to free.

I'm awaiting a quote for an upgraded 11KV which involves about 2000m of new triplex cable. Oh and of course the existing RMU will need replacing as well??.

 

[MJPD29]

I'd be seriously considering the 3 phase option with that many showers.

 

[brianmoooore]

I'd be seriously considering the 3 phase option with that many showers.

I'd be considering conventional showers that use stored hot water.

 

[Edward Currant]

The costs are normally in the groudworks to replace the cable, not the cable itself, so there's limited difference 1ph to 3ph - BUT - be prepared for the DNO to use this as an excuse to claim they need to replace half the cables in the area to facilitate that extra 40 amps. I had this on a job last year - needed to move an intake a couple of meters, DNO 'young buck' surveyor came along and quoted £15k to the developer due to claiming to need to re-lay the whole street. I left it a couple of months and then made a fresh enquiry under my business instead, had a chat with the senior area DNO engineer on the phone, he 'popped to site for a coffee while passing' and the job got done two weeks later for minimum charge at £400ish

God Damn that is quite a difference. Really hopeing i get a decent surveyor