Discuss RCD/ combined afdd breakers in the UK Electrical Forum area at ElectriciansForums.net
Hi it's for fault protection ,and not additional protection ,but thanks anywayIf its for additional protection only you only need to do the 5X test at either 150mA or 250 mA if the 150 don’t comply , though personally i still do all 6 test as its what I’m used to, and it seems a better way to me.
Or if every circuit has been so poorly designed that ADS cannot be achieved by coordination between the device and the EFLI, leading to the use of RCDs for fault protection.Sorry i thought you said its a TN-S Supply , it would only be fault protection if on a TT.
Hi these are double pole rcbos with combined Afd ,all I would like is the maximum mS parameters for x1 and X5 for the rcbo ,this is the sole protection ,each individual circuit is covered by one of these .Or if every circuit has been so poorly designed that ADS cannot be achieved by coordination between the device and the EFLI, leading to the use of RCDs for fault protection.
I have a feeling we're not in possession of the full and accurate facts ?
x1 = 300msall I would like is the maximum mS parameters for x1 and X5 for the rcbo
Exactly!!!Excuse particularly verbose answer, to try and clear up some confusion here.
Double pole RCBO's with AFD have three elements:
1) over current protection, same as fuse or MCB
2) arc-fault detection
3) RCD protection (earth leakage)
In BS7671 terms:
-fault protection is deemed to be via circuit's cpc, earthing, bonding and the fact that fault would operate the over-current element (same as fuse or normal MCB)
-the RCD element is providing additional protection.
The thing that seems to be causing confusion is that while the whole device is part of the circuit's fault protection, the RCD element is deemed to be additional protection.
I think most of the above is already understood and its just a terminology thing.
x1 = 300ms
x5 = 40ms
Hi TimExcuse particularly verbose answer, to try and clear up some confusion here.
Double pole RCBO's with AFD have three elements:
1) over current protection, same as fuse or MCB
2) arc-fault detection
3) RCD protection (earth leakage)
In BS7671 terms:
-fault protection is deemed to be via circuit's cpc, earthing, bonding and the fact that fault would operate the over-current element (same as fuse or normal MCB)
-the RCD element is providing additional protection.
The thing that seems to be causing confusion is that while the whole device is part of the circuit's fault protection, the RCD element is deemed to be additional protection.
I think most of the above is already understood and its just a terminology thing.
x1 = 300ms
x5 = 40ms
643.8Hi Tim
Thank you so much for this ,please can you tell me where these measurements are quoted in the regs book ,and as far as filling in the test sheets ,am I measuring on x1 or X5 .
Regards
Reply to RCD/ combined afdd breakers in the UK Electrical Forum area at ElectriciansForums.net
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