Discuss Zs reading does not meet current regs in the UK Electrical Forum area at ElectriciansForums.net
Is there any reasons why you chose the C rated protective device??Yes it’s a 30mA bs 61009 type C RCBO.
Exactly ,that is why one member on here was asking for more information like the Ib,cable size etc to confirm the design of the circuit.Why is a circuit that feeds a single socket outlet (albeit a double) fed by a 32A protective device in the first place?
It does meet regs mate. Disconnection time is taken care of by a device permitted for fault protection. An RCD.It’s in a sheltered housing block, every socket on each floor in on a radial, this socket is next to stairs on the landing, same on each level.
I’m only adding a fused spur to it because I’m installing stairlifts for back ups to the main lifts.
when I did the Zs it came back a 0.79. Which is higher then the current tabulated results you fined in minor works book.
When carrying out trip times, it’s all satisfactory, 28.6 Ms at x 5 and 18.5 at x1. Cables run in 2.5 singles. Zsdb is 0.20.
Iv not installed the circuit, nor have i designed it. I’m only adding about 2 1/2 meters of cable. Problem is The jobs not been priced for extra work, hence the reason I asked do I just mention on the cert, that the current installation doesn’t meet current regs and advise the chainge the RCBO for a B .
Which regulation are you referring to Essex?
Any chance of that reg no Essex?
..it will be fine. ..
The circuit will remain the same regardless of the device used for earth fault protection, it will remain the same whether a type C or B device is used. There is not a perceived problem with the circuit, only a perceived problem with the choice of fault protection device. The apparent purpose of changing the device is to meet disconnection times when the present device already meets disconnection times, beyond stupid.Don't agree. You are adding to this circuit, so you are taking responsibility for the whole of that circuit, including the bit installed by others before you. If the test results don't roughly agree with the figures you would expect, then you can't sign this off without finding out why and correcting it, whether it conforms to the letter of the regs. or not.
The fact that this job was a fixed quote isn't relevant, and shows the dangers of quoting blind before any tests. You can appeal to the client's better nature and ask them to contribute to correcting the pre existing problem, but if they won't, it's out of your pocket and write it off as experience.
Which regulation are you referring to Essex?
Would appreciate it if you'd let me know when you find the reg no you are basing your disagree on. If I've got it wrong I'd like to know which regulation I've missed.
Any chance of that reg no Essex?
Any sign of that reg number yet Essex?Nope. I am on holiday.
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