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Discuss Main Earth Regs in the Electrical Wiring, Theories and Regulations area at ElectriciansForums.net

L

LC2

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Hi all new to this forum site and a fairly green sparky. Need a bit of advice hope some1 can help, OK got stacked consumer units to change (main one and an economy 7 smaller one) main earth from supply side only goes to main consumer unit (16mm) and then a 10mm is just dropped down from main unit to smaller one but they both have sepertate meter tails. Please can anyone tell me if this meets 17th regs as i cannot seem to find it in there anywhere. I beleive that i should chenge the 10mm to 16mm but still do not know if linking the consumer units like this is OK. Or does the smaller unit need it's own main earth from supply side. Helppppppp. I am aware that i could put it all on one unit with seperate main switches but job is to just change them as they are.
 
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G

Guest123

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  • #2
Hi and welcome to the forums.

As a rule if a DB has seperate meter tails, then I would install a seperate earth aswell.

Cheers.
 
S

Spudnik

  • Thread Starter Thread Starter
  • #3
Agree with Leonard.

16mm main earth from cutout to MET. 16mm from MET to each CU.

Dont forget this work would also need notifying under Part P of the building regs.
 

EddieB

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Arms
Apologies for that, I meant to say that I'm sure the upgrading of main earthing and bonding is not notifiable
 
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