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Discuss Zs reading does not meet current regs in the Electrical Forum area at ElectriciansForums.net

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Doing some prior tests befor installing a fused spur from a radial circuit, and have found the Zs reading higher then the current regs, obviously it complys with a past reg, but as I’ll be doing a minor works for the job, when filling out their cert would I just put it down as an observation in comments on current installation and grade it C3.

Cheers.
 
N

Nigel

Can you change the OCPD to one with a higher max permitted Zs?

Also you cannot code on a MWC.
 

GBDamo

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Supporter
Personally, no.

The Zs of your install must meet current regs.

This cannot be achieved, without additional works, if the current Zs doesn't comply.

Is the current Zs measured, calculated or from a previous cert?

How many points are on the circuit you're adding to, tightening all terminals could get you down to the Zs you require.
 
  • Thread Starter Thread Starter
  • #5
Thought not, should just mention as an observation then. Yes thought about changing the RCBO, only it won’t have been quoted for by the company I work for as we don’t do major electrical work, I’m just fitting a spur for a stairlift charger, carry out testing and fill in minor works.

Cheers
 

GBDamo

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Supporter
Just though, could it be argued that the Zs you're interested in is that relating to the fuse in the FCU, which for a 13A BS1362 is 1.8ohms for a 0.4 second disconnection time..
 
  • Thread Starter Thread Starter
  • #7
There is only a single double socket on the circuit, I’m just adding a fues spur to it on other side of lading, it’s fairly long run to be honest 10-15 mtr of top of my head.
 
Just though, could it be argued that the Zs you're interested in is that relating to the fuse in the FCU, which for a 13A BS1362 is 1.8ohms for a 0.4 second disconnection time..
What about fault protection up to the spur.
 

Zdb

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What is the Zs reading you're getting?

Also what is the type, rating and make/model of the protective device?
 
  • Thread Starter Thread Starter
  • #13
Reading is 0.79 at the furthest point, like I said it’s the only socket on the circuit, and is about 10-15mtr run from its DB
 
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