Scolmore Electrical Products
This official sponsor may provide discounts for members

Discuss Are 2 Earth Rods Needed ? in the Electrical Forum area at ElectriciansForums.net

T

TPES

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

TT Supply.

Main CU, With earth to rod outside.

Second CU for storage heaters, Also on a seperate Rod outside.

I have been told this second rod is not needed for the second board, Aslong as the resistance of the first earth on the 1st CU is within the reg limits (lower than 200 Ohms) then the first rod can also earth the second CU. Is this correct?

Ive measured the first main Rod to be 123 Ohms, I know its unusually high but its within the limits..

What do you lot think?
 
T

TUX

  • Thread Starter Thread Starter
  • #2
1 rod is fine link ed to both boards and 123 ohms is afine for tt system 200 ohms is only a recomendation and higher resistances are still acceptable

regards tux
 
S

Spudnik

  • Thread Starter Thread Starter
  • #3
.... 123 ohms is afine for tt system 200 ohms is only a recomendation and higher resistances are still acceptable

regards tux
Indeed it is only a recommendation, however it is said that anything over 200ohms could be unstable.:)
 
i agree
the nic give a guide of 100 ohms but 200 is fine so your reading is pretty good really
i woulld say 1 stake per main incomer
so your stake to earth bar then to each cu from there
 

andyb

-
Arms
Esteemed
All the above are correct.
All you need is an earth and a main earth terminal which both boards can use.
However , there is nothing wrong in using 2 rods linked to give you a lower earth reading.
 
A

acat

  • Thread Starter Thread Starter
  • #6
Perfectly ok with one rod, perfectly ok with two why fix it if its not broken:)


Chris
 
SuperlecDirect - ElectriciansForums.net Electrical Suppliers
This official sponsor may provide discounts for members

Reply to Are 2 Earth Rods Needed ? in the Electrical Forum area at ElectriciansForums.net

uHeat Banner - Forum Discount Available
This official sponsor may provide discounts for members
Top Bottom