Max zs on rcbo

[KNIPEX]

Ive asked this before but never really got any replies, but now i need a definte answer.

ive been told by a good source that if the zs reading taken at a socket for eample is over the max allowed in table 41 b in the regs, as long as its on an rcbo its still safe and complies with regulations.

can anyone on here confirm this please and give reasons why.

i have a number of ringmains on type c rcbo which are over max zs values but i can not get type b rcbo for weeks, this is a big issue for me atm.

help please, i have the client giving me major hassle.

thanks.

 

[Spudnik]

Have you looked in the OSG and the regs to see what they require?

What Ze did you get?

This may play a large part in why your Zs readings are out.

I would say yes its fine, however, i dont have the regs with me to double check at the mo.

 

[Guest123]

Hey.

Max Zs applies to all 61009 RCBO's aswell, if they do not comply then you need to change them.

Hope this helps

 

[hughesy]

Hey.

Max Zs applies to all 61009 RCBO's aswell, if they do not comply then you need to change them.

Hope this helps

Hi sory to intrude but just wondering if lennytheloon would read my thread 3 phase voltages.cheers

 

[dazza69]

Hi KNIPEX max Zs for a 61008 or 61009 RCD or RCBO 1667 ohms.take a look at table 41.5 on page 50 of the 17th edition. All will be revealed. Or not!

 

[Spudnik]

Hi KNIPEX max Zs for a 61008 or 61009 RCD or RCBO 1667 ohms.take a look at table 41.5 on page 50 of the 17th edition. All will be revealed. Or not!

That is for TT systems.

The OP didnt state which system was in use.

 

[ezzzekiel]

max zs figures should always be tried to meet however if not then additional protectional by rcd/bo ect are used and max zs is 1667ohms regardless of earthing system tpe..

 

[dazza69]

max Zs 1667ohms applies to all earthing systems not only TTs

 

[ezzzekiel]

i just said that

 

[dazza69]

sorry mate only read jasons6930 reply.seems i jumped the gun a bit!