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 44 replies
  • Subscribers 32 subscribers
  • Views 2790 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

EV install on a TT system - DNO PME?

Former Community Member
Former Community Member

Hi, new to this forum.

These might be obvious questions but I can't find an answer to it. 

Background.

A domestic house has a TT supply, has had a CU changed in 2019 but the new owners have no paperwork.

I can find no evidence of an earth rod anywhere and all the bonding cables go to the gas/water supplies. I did a quick Zs at the board = 2.9ohms. 

How do I know if the installation has been PME'd on the pole? (overhead wires)

Second part is - they want an EV charger installed that they brought with them from their old house. It will require TT, but as this property is TT it shouldn't need to have a separate rod.

If the installation is  a PME'd TT I would assume I would need to TT the EV?

  • 0

    AJJewsbury: 
     

    And mid route?

    514.3.2 “Every core of a cable shall be identifiable at its terminations AND PREFERABLY THROUGHOUT ITS LENGTH.” (Caps. mine)

    and…?

    Whenever you over-sleeve the ends you loose the ability to see the identification mid-route - where it be blue oversleeved brown on switch drops, black oversleeved G/Y in SWA, or G/Y oversleeved something else. As it's nigh-on impossible to get manufactured multi-core cables with just the core colours we want for every situation, something has to give - so it's only a preference in BS 7671 rather than a requirement. Nothing special for G/Y cores.

       - Andy.

    Except the  green/yellow  single core protective conductors mentioned in 514.4.2 which are given special mention and must not be oversleeved. I apply this principle to all green/yellow C.P.C.s. If we become slack about these things we will apply plumbers' rough working systems and wire tank thermostats in three core flex with the green/yellow being unsleeved and used as a live conductor. Not good.

     

    Also, many insulated conductors are not fully sleeved at the terminations, they just have a partial sleeve or a small tape flag. In this case it can be confusing. Or if the tape peels off the unknown green/yellow core may be a live conductor in reality. Not good as well.

     

    Z.

  • 0

    Slide-over alphanumeric markers or sleeves are used in control panels where much of the conductors are insulated in the same colour (e.g. often blue for DC controls). No-one seems to have too much of a problem.

  • 0

    gkenyon: 
     

    Slide-over alphanumeric markers or sleeves are used in control panels where much of the conductors are insulated in the same colour (e.g. often blue for DC controls). No-one seems to have too much of a problem.

    The machines are made by professions dedicated to high quality. The nimble wiremen/women are used to using alphanumeric markers, we may not be. I connected up a new three phase workshop machine last week. The internal wiring was beautiful and neat. The three phase terminal block used all black conductors. Earth was of course special and coloured green and yellow, as it normally is in machine control cabinets. The average sparks on site will find P.V.C. sleeving quicker and easier. Plumbers, builders and kitchen fitters may not use anything to indicate the purpose of wrongly coloured conductors.

    Z.

  • 0

    Multi core micc always focused good core marking on installing

Community Rules & Guidelines