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 29 replies
  • Subscribers 32 subscribers
  • Views 3375 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

Cable calculations

MrJack96
Hi guys i wanted to calculate the maximum run when spuring of a ring final circuit is there any equations or is it just as simple as calculating VD to the furthest point in the ring and then VD to the end of the spur. The reason for the question is I want to spur of an existing socket using a 10meter run of 2.5 for an outside socket. Just want to Double check it’s sufficient 


thanks guys
Parents
  • 0
    Nothing wrong with a good solid Wylex CU or indeed rewireable fuses - they're still recognised by BS 7671 after all. If you need additional devices (RCDs, SPDs, AFDDs) they can always be added in separate enclosures rather than replace the CU, if preferred.


    The problem with 13A sockets with built-in RCDs is that standard they comply with - normally BS 7288 - as BS 7671 now stiplates exactly which standards an RCD need to meet and while all the usual DIN-rail mounting types (e.g. BS EN 61008 and BS EN 61009) are on the list, BS 7288 isn't (and them that know tell us that it's deliberate, not just an oversight).


    You might find a SRCD that also complies with one of the listed standards, or alternatively fit a DIN-rail enclosure next to or including the socket - and provided there was no requirement for RCD protection upstream - those would be compliant solutions.


      - Andy.
Reply
  • 0
    Nothing wrong with a good solid Wylex CU or indeed rewireable fuses - they're still recognised by BS 7671 after all. If you need additional devices (RCDs, SPDs, AFDDs) they can always be added in separate enclosures rather than replace the CU, if preferred.


    The problem with 13A sockets with built-in RCDs is that standard they comply with - normally BS 7288 - as BS 7671 now stiplates exactly which standards an RCD need to meet and while all the usual DIN-rail mounting types (e.g. BS EN 61008 and BS EN 61009) are on the list, BS 7288 isn't (and them that know tell us that it's deliberate, not just an oversight).


    You might find a SRCD that also complies with one of the listed standards, or alternatively fit a DIN-rail enclosure next to or including the socket - and provided there was no requirement for RCD protection upstream - those would be compliant solutions.


      - Andy.
Children
No Data

Community Rules & Guidelines