Bulk Workwear - Clothing Suppliers for the Whole Forum Network
This official sponsor may provide discounts for members

Discuss calculating csa of earthing conductor with BS1361 fuse in the Electrical Wiring, Theories and Regulations area at ElectriciansForums.net

K

knasher

Welcome to ElectriciansForums.net - The American Electrical Advice Forum
Head straight to the main forums to chat by click here:  American Electrical Advice Forum

Maybe I'm overlooking the obvious but how would you calculate the min. csa of an earthing conductor of say a tn-s system when there is no time/current graph for a 1361 fuse in the BGB? Do you just obtain If from Uo/Ze and then use this in the adiabetic equation. Ta
 
CK Tools :) The professionals choice when it comes to Electrical Tools
This official sponsor may provide discounts for members
D

Deleted member 26818

  • Thread Starter Thread Starter
  • #3
Look in a copy of the BRB, or obtain the information from the fuse manufacturer.
You would not be able to conduct the adiabatic equation without this information, as you require a value for 't'.
 
K

knasher

  • Thread Starter Thread Starter
  • #4
Thanks Spinlondon, ive still got BRB somewhere, so will dig it out.
 
K

knasher

  • Thread Starter Thread Starter
  • #5
As a matter of interest, what is the logic behind IET not bothering to do time/current graphs for certain fuse types?
 

ruston

-
Mentor
Arms
Esteemed
Advent Win
From the BGB -1361 spec for cartridge fuses for ac in domestic or similar premises replace by BS 88-3: and withdrawn 1/3/2010.
 
Last edited:
K

knasher

  • Thread Starter Thread Starter
  • #7
Hi rushton, are you saying BS88-3 is now the replacement for the 1361 fuse? or that BS88-3 replaced the BS1361 fuse but now not deemed as a suitable replacement? Just trying to get this clear in my head please
 
So, to satisfy an old man's confusion, if the installation has a BS1361 fuse and it's now been turned into a BS88 type 3 by the magic of the BGB, do you use the info for BS88 fuses in the tables?
 

ruston

-
Mentor
Arms
Esteemed
Advent Win
Yes as understand it the spec for BS 1361 has been removed and replaced by BS88 -3: 2010 . It's on page 277 of the green book. and the book will only list the current standards. Appendix 1 on the top of the page gives the criteria.
 

ruston

-
Mentor
Arms
Esteemed
Advent Win
So, to satisfy an old man's confusion, if the installation has a BS1361 fuse and it's now been turned into a BS88 type 3 by the magic of the BGB, do you use the info for BS88 fuses in the tables?
I would still use the old specs its as clear as mud.
 
D

Deleted member 26818

  • Thread Starter Thread Starter
  • #11
It's the same as with the old BS3871 MCBs.
Still in use, but the time current curves are no longer in BS7671.
 

Reply to calculating csa of earthing conductor with BS1361 fuse in the Electrical Wiring, Theories and Regulations area at ElectriciansForums.net

Bulk Workwear - Clothing Suppliers for the Whole Forum Network
This official sponsor may provide discounts for members
SuperlecDirect - ElectriciansForums.net Electrical Suppliers
This official sponsor may provide discounts for members
Top Bottom