continuity of cpc

[iceman]

hi theres a 20 amp circuit breaker suppying the the garage witch feeds socket outlets and a light circuit the supply comin in goin to a j/b then to a 13amp fuse spur i wanted to knw when messuring Zs do i take it at spur i wouldnt of thought i take it frm light fitting radial sockets cos there are seperate circuits

thanks

 

[Spudnik]

Zs is measured at the furthest point on the circuit.

So, just guessing, at the last light fitting on that 20A radial, or literally, the furthest point from the CU.

 

[iceman]

so i gotta eather take a reading for Zs at the futhest light fitting or the socket outlet witch ever is the greater???

 

[Guest123]

Hi.

Sorry I thought you had a DB in there.

If it's just the one circuit then yes you just find the firthest point on it, and measure your Zs, from there.

Although if coming out of that joint box that you have, a feed to socket outlets and then another feed to a fused spur in turn feeding your lights then I would take 2 readings and record the highest.

Cheers.