TT earthing and supply | Page 2 | on ElectriciansForums

TT earthing and supply

Discuss TT earthing and supply in the Electrical Wiring, Theories and Regulations area at ElectriciansForums.net

January's professional electrician
 

Attachments

  • [ElectriciansForums.net] TT earthing and supply
    IMG_20130303_114654.jpg
    211.3 KB · Views: 29
  • [ElectriciansForums.net] TT earthing and supply
    IMG_20130303_114555.jpg
    240.3 KB · Views: 19
  • [ElectriciansForums.net] TT earthing and supply
    IMG_20130303_114536.jpg
    247.4 KB · Views: 19
jamie-spark said:
January's professional electrician
Click to expand...


Thanks for taking the time to post the images jamie
[ElectriciansForums.net] TT earthing and supply

Have to go,I'm just nipping to the surgery to get one of those neck braces lol
[ElectriciansForums.net] TT earthing and supply
 
jamie-spark said:
January's professional electrician
Click to expand...
It is interesting that the non discrimination is shown as a type S 100mA RCD tripping in 100ms at 60mA, which does seem a very poorly designed RCD since the minimum time delay should be 150ms and the RCD should not trip until 100mA (though it is likely to trip earlier, 60mA seems a bit low)
 
Richard Burns said:
It is interesting that the non discrimination is shown as a type S 100mA RCD tripping in 100ms at 60mA, which does seem a very poorly designed RCD since the minimum time delay should be 150ms and the RCD should not trip until 100mA (though it is likely to trip earlier, 60mA seems a bit low)
Click to expand...
60ma does seem low. But when ramp feasting 30ma RCDs I find it can range between 17ma-25ma with out going load disconnected.
I have fitted a few of these 100 ma s type RCDs recently with 30 ma further down stream on a farm. I may be going back, pretty soon so I could ramp test it and check tripping time and post the results
 
Doesn't really matter whether you fit a 100mA or 300mA S type to be honest on a TT system, as additional back-up for 30mA RCDs downstream. What i will say, is of what must be by now, the many hundreds (if not more) of times we have used 100mA S type RCDs for discrimination purposes for downstream 30mA units, i can't remember ever having problems such as been described in this article!!

I must have a more in-depth read, as i haven't had that must time these past couple of days, and have only had a quick over-view....
 

Reply to TT earthing and supply in the Electrical Wiring, Theories and Regulations area at ElectriciansForums.net

News and Offers from Sponsors

PCBWay
  • Article
Meet PCBWay at electronica A1.163
Join us at electronica 2024 in Munich! Since 1964, electronica has been the premier event for technology enthusiasts and industry professionals...
    • Like
Replies
0
Views
454
PCBWay
PCBWay
Electrical2go
  • Sticky
  • Article
📢 Best Sellers Catalogue Now Available! 📢
Good to know thanks, one can never have enough places to source parts from!
Replies
4
Views
1K
Bob Labla
B
Dan
  • Article
The Official Sponsors of ElectriciansForums - There are currently 8
OFFICIAL SPONSORS These Official Forum Sponsors May Provide Discounts to Regular Forum Members - If you would like to sponsor us then...
Replies
0
Views
2K
Dan
Dan

Similar threads

N
TT advise
It's not the same scenario, though. Tails more than 3mtrs can be overcome by using a fused switch and rcd board, whether the earthing system is...
2
Replies
18
Views
834
mainline
mainline
J
UK Main Earth and Gas Bond
Indeed it would be. But that would mean having 2 things to disconnect instead of one. More margin for error. Of course, any diligent spark would...
Replies
6
Views
673
loz2754
L

OFFICIAL SPONSORS

Electrical Goods - Electrical Tools - Brand Names Electrician Courses Green Electrical Goods PCB Way Electrical Goods - Electrical Tools - Brand Names Pushfit Wire Connectors Electric Underfloor Heating Electrician Courses
These Official Forum Sponsors May Provide Discounts to Regular Forum Members - If you would like to sponsor us then CLICK HERE and post a thread with who you are, and we'll send you some stats etc

YOUR Unread Posts

This website was designed, optimised and is hosted by untold.media Operating under the name Untold Media since 2001.
Back
Top