Rules and Guidelines
Want to participate in the discussions? Please read our Community Rules and Guidelines. Need some help? Visit Support and Answers.

  • State Not Answered
  • Locked Locked
  • Replies 11 replies
  • Subscribers 32 subscribers
  • Views 1049 views
  • Users 0 members are here
Options
You may also be interested in
This discussion has been locked.
You can no longer post new replies to this discussion. If you have a question you can start a new discussion

Making two properites into one

Rob Bain
Afternoon all,

An MOD client wishes to form one large property from two semi-detached properties, keeping both consumer units. I have looked through the latest BS 7671 for any glaring regs that are going to stop this from happening, and can only see the separation distance regulation that must be applied. Obviously am trying to persuade them that it would be better to have only one source of  supply into the property and hence only one consumer unit. Has anybody else come across this in their line of work and if so how did they get over it to maintain compliance with BS7671?


thanks in advance.

Rob
Parents
  • 0
    I think it is not really going to be  a question of if the MOD own the house or not, but who owns the transformer that supplies it, and if the distribution is TNS or TNC-s.

    The problem of bonding two TNC-s supplies is the same as neighbours both bonded to the same water pipe - it is in effect creating a second neutral path.

    However, even if it is fed from an MOD transformer, there will be the same issue, it is just they will probably be less perturbed by it. (and DNO rules stop at the 11kV or 33kV side)

    Of greater concern in a domestic setting I'd suggest  is that turning off what appears to be the main switch will only half isolate the installation.

    Are they on different phases ?

    Given standing charges and the long term cost and aggro of two meters, unless the place is massive, the most economic thing to do long term  is as suggested, is to get one supply capped off, put an isolator at the other, and run a submain so both CUs are fed  from the same meter and isolator.

Reply
  • 0
    I think it is not really going to be  a question of if the MOD own the house or not, but who owns the transformer that supplies it, and if the distribution is TNS or TNC-s.

    The problem of bonding two TNC-s supplies is the same as neighbours both bonded to the same water pipe - it is in effect creating a second neutral path.

    However, even if it is fed from an MOD transformer, there will be the same issue, it is just they will probably be less perturbed by it. (and DNO rules stop at the 11kV or 33kV side)

    Of greater concern in a domestic setting I'd suggest  is that turning off what appears to be the main switch will only half isolate the installation.

    Are they on different phases ?

    Given standing charges and the long term cost and aggro of two meters, unless the place is massive, the most economic thing to do long term  is as suggested, is to get one supply capped off, put an isolator at the other, and run a submain so both CUs are fed  from the same meter and isolator.

Children
No Data

Community Rules & Guidelines