In fairness to the NIC there is no additional charge to opt into the rented property inspection scheme for Approved Contractors so long as you meet the criteria.
Not only alarm manufacturers - it's a requirement of BS 5839.
I also don't understand removing life safety systems though before alteration/replacement.
In my opinion if you have distribution boards downstream a reasonable distance from the other distribution boards then these really should have their own SPD as well. One at the origin won't cut it.
Forget whether it complied with previous Regulations or not. It really has no relevance as to its safety given our current (excuse the pun) understanding of this. Instead just consider it on the basis of what safety deficit a non-compliance poses, and how serious that is.
I'd love to try SCUBA diving - to be fair I have done it a couple of times but never done a PADI course or anything like that.
My parents used to dive in Saudi in the '80s, possibly kept diving into the early '90s.
It won't cause it to trip, but it still means that it's operating above the load it's designed to sustain and therefore also running hotter than intended. It isn't a compliant design.
A borrowed neutral is required to be on one circuit rather than just one RCD though for safety reasons (which of course would no longer render it a borrowed neutral).
I hate the description of the Regulations "not being retrospective". No such comment is made within the Note from the HSE. What it actually states is that compliance with previous iterations of the Regulations may not necessarily imply that the installation is now unsafe or that it requires...
Indeed they do, but I must admit I find this suggestion somewhat questionable. Surely if an RCD is required, and the circumstances of the installation dictate that it needs to be a minimum of a Type A RCD because a Type AC RCD could be disabled by circulating DC currents then a C3 Observation...
In fairness I always install RCD protection upstream of a Zappi installation as the internal RCD is not to any of the following Standards: BS EN 61008-1, BS EN 61009-1, BS EN 60947-2 or BS EN 62423.
I seem to recall that the anti-islanding protection operates within about 5 seconds (could be wrong about exact length of time allowed), so certainly it would be well beyond the permissible disconnection times of an RCD.
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