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No need to change anything, it complys.
Next job.
Next job.
Discuss Zs reading does not meet current regs in the Electrical Forum area at ElectriciansForums.net
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..
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
That's why I like this game, and this forum.Well I go to the bottom of our stairs. I got disagrees before, on saying the exact opposite of what GBDamo is saying and getting dumb for here.
Well I go to the bottom of our stairs. I got disagrees before, on saying the exact opposite of what GBDamo is saying and getting dumb for here.
What about fault protection up to the spur.
Ooh, you're so 17th Alan!Earth fault disconnection times are met by the RCD, no requirement to change to a type B unless you want to waste your's or your customers money.
411.4.4 note 2 applies and 411.4.5
Using 1667 as a get out for poor design doesn’t sit right with me.
As asked before what rating is the RCBO, nearest C type is 32 amp at 0.68. What CSA is the cable and what is Ze and earthing arrangement?
In this case then due to bad design/change in Regs the high Zs is through no fault of yours.
In this case I would utilise the RCBO for fault protection although. This is not permitted in Bs7671 so will need to be recorded on the MWC as a deviation.
An RCD is a permitted means of fault protection, there is no deviation.Changing it to a B Type may import nuisance tripping when the stairlift is starting.
Only a possibility but personally based on the info we have got I would leave it as a C Type and utilise the RCD for fault protection and note the deviation on the cert.
An RCD is a permitted means of fault protection, there is no deviation.
It complies with Bs7671 therefore it is not a deviation. Design intention or otherwise it complies.
However if it’s protecting socket outlets then you would install 30mA rcd protection anyway so both fault protection and additional protection is covered.Yes only when a suitable Zs is not obtainable. For example a high Ze. It is not permissible to cover up poor design which is the only reason for high Zs when the Ze is low.
This is the reason it should be recorded as a deviation because it was not the design intention to rely on the 30mA RCD max Zs of 1667 ohms.
Also if 30mA RCD was not a requirement for the circuit for any other reason then a 30mA RCD would not be the correct OCPD for fault protection in this instance. You would install a 500mA RCD.
There is no requirement to install a circuit to a maximum Zs for a fuse or MCB, as long as the device used for fault protection meets the required disconnection time with the measured Zs. Other factors such as length of the circuit/R1+R2 may be a deviation. But as long as other design factors of the circuit comply and the disconnection time is met by a permitted device there is no deviationInstalling a circuit that does not meet max Zs does not comply with BS7671.
Reply to Zs reading does not meet current regs in the Electrical Forum area at ElectriciansForums.net
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