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

  • State Helpful Answer
  • Replies 10 replies
  • Subscribers 37 subscribers
  • Views 278 views
  • Users 0 members are here
Options
You may also be interested in

Domestic 2 phase system and additional single phase supply.

Steven Dwight

Hi everyone, a domestic refurb has an existing 2phase supply. The DNO cut-out is arranged like a standard PME system. Is it reasonable to use the same earth terminal for both phases. I guess this is the same as what would be standard for a 3phase system, only in this instance 2phases. Additionally our client has applied for another single phase supply that is to enter site at another location, therefore 2 supplies onto one site. The DNO seem happy with this though I find it unusual as commercial projects do not seem to like two PME supplies onto one site?

Parents
  • +1

    not seem to like two PME supplies onto one site

    Depends what's meant by "site" - if it's to two separate buildings situated well apart but just happen to be on the same farm for instance, that's likely to be fine. If it's two supplies into the same big building with lots of shared metallic pipework or structural steel, that's much more likely to be a problem. It's the somewhere in between that gets tricky...

    Some DNOs do have ways around this sort of thing - e.g. having one common PME point outside the site, and running PE and N separately from there to each intake position. It's still PME, but avoids the worst of the diverted N currents problems. 

       - Andy.

  • +1 in reply to AJJewsbury

    Any scope to ignore both company electrodes and make it 'TT' ? Eliminates the other problem with the pool in one stroke.

    Mike.

Reply Children
  • 0 in reply to mapj1

    Hi Mike,

    Yes my bolt and braces approach would be a TT system, especially when considering the pool hall problem.

    If providing a TT system allows not to bond the rebar, therefore avoiding the need to damage the slab, then this has to be the preferred option. 

    As mentioned in the other thread, it will be interesting to see what the lightning protection / earthing specialist comes back with.

    Steve 

Community Rules & Guidelines