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ZS

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Discuss ZS in the Periodic Inspection Reporting & Certification area at ElectriciansForums.net

R

rapier

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Evening Guys

Just 2nd fixed a barn conversion at work.

We are using a 3 phase board as the suppliers provided 3 phase.

So on all the circuits we used rcbo's at c type i dont know why my boss choose c types.

So when i came to test the installation the results are fine but are over on max zs but not by a million miles away.

So are these fine as there protected on a rcbo or should i tell my boss to convert to b type rcbo's.

Thanks guys
 
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M

maddfridge

  • Thread Starter Thread Starter
  • #2
Evening Guys

Just 2nd fixed a barn conversion at work.

We are using a 3 phase board as the suppliers provided 3 phase.

So on all the circuits we used rcbo's at c type i dont know why my boss choose c types.

So when i came to test the installation the results are fine but are over on max zs but not by a million miles away.

So are these fine as there protected on a rcbo or should i tell my boss to convert to b type rcbo's.

Thanks guys

hi there

i seem to recall where the ZS cannot be met the installation of a rcd was required to give additional protection in order to meet the required disconnection time of the protective device where this CANNOT be achieved. his would explain the rcbo

I would look again at the ZS as did you take into account the R! and R2 correction factors for temperatue Guidance not no3 page 107 appendix B
I have done 2391 testing but have not come across this in the course was in the old guidance notes just had a look shows we cannot always kep up with the changes

cheers
 
E

ezzzekiel

  • Thread Starter Thread Starter
  • #3
this is usually the case, especially with tt systems thats why rcds are usd when disco times cant b met
 
S

Spudnik

  • Thread Starter Thread Starter
  • #5
So are these fine as there protected on a rcbo or should i tell my boss to convert to b type rcbo's.

Thanks guys
There are very few manufacturers who make a 'b' type RCBO.
 
D

dave54644

  • Thread Starter Thread Starter
  • #6
Check Regs table 41.5 for RCBO Zs you will see it is 1667 ohms at 30mA
 
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