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 3 replies
  • Subscribers 32 subscribers
  • Views 775 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

Re-inventing the wheel

lyledunn
I have just received my copy of IS 10101 2020 which is the Irish equivalent of BS7671 2018. It is over 760 pages so is a mighty tome indeed. My job requires me to be on top of both documents. You would imagine that would not be so difficult as both are effectively based on the 60364 series of CENELEC HDs. Yes there is much commonality but you would get the impression that the respective national technical committees have done their best to tear up any concept of harmony and have sought to be as different as they possibly can. That might be inevitable say with the U.K. and Romania but having such disparity between the U.K. and Ireland seems ridiculous. 

What 7671 has as Parts, 10101 has as Chapters. Sections in one document are Clauses in the other. Testing RCDs in one is different to testing RCDs in the other. Zs for protective devices in 10101 has no Cmin to apply and measured Zs is a maximum of 2/3 tabulated. You need your maths cap on for 10101 when working out voltage drop as there are no voltage drop tables. You have to use the resistivity of copper adjusted for temperature and a given per metre reactance with the power factor of the load applied to each. None of this 70v stuff for EVs in 10101, just a stipulation that if connecting to a TN system it can only be TN-S. And so it goes on. 

To give me something to do while imprisoned, I am going to chart the most blatant differences.
Parents
  • 0
    I guess there could be justifiable national differences - all our problems with PME wouldn't apply if the national suppliers didn't do TN-C-S (or didn't supply an Earth connection at all - like in France) or didn't randomly convert TN-S systems to PME without telling anyone. Likewise if the supplier was less good at guaranteeing Ze - you might need to build in a larger margin for Zs.


    Then there are of course the desire to preserve national traditions - like reduced c.s.a. c.p.c.s and rings in the UK which most of the rest of the world can't be bothered with.


    I guess there's always the temptation to be different - especially when your history is one of escape or opposition to the establishment (non-conformist chapels often had architectural details that were solely the result of wanting to be different from the established church - like not having centre aisles - despite being not at all practical (for weddings or funerals for example)).


      - Andy.
Reply
  • 0
    I guess there could be justifiable national differences - all our problems with PME wouldn't apply if the national suppliers didn't do TN-C-S (or didn't supply an Earth connection at all - like in France) or didn't randomly convert TN-S systems to PME without telling anyone. Likewise if the supplier was less good at guaranteeing Ze - you might need to build in a larger margin for Zs.


    Then there are of course the desire to preserve national traditions - like reduced c.s.a. c.p.c.s and rings in the UK which most of the rest of the world can't be bothered with.


    I guess there's always the temptation to be different - especially when your history is one of escape or opposition to the establishment (non-conformist chapels often had architectural details that were solely the result of wanting to be different from the established church - like not having centre aisles - despite being not at all practical (for weddings or funerals for example)).


      - Andy.
Children
No Data

Community Rules & Guidelines