- Reaction score
- 2
Been out to replace an oven on an installation which pre dates the need for RCD's so only has MCB's, the earthing arrangement is TT. As I am only changing the oven this need not be RCD protected but is the maximum Ze still 200ohms?
Discuss TT system with No RCD in the Periodic Inspection Reporting & Certification area at ElectriciansForums.net
Understood, however this installation does not have an RCD and the work I am carrying out, ie replacing a cooker, does not require an RCD. I need to know the max Ze for a TT system without an RCD.
Thanks
Thanks Dave. That makes sense. I have never seen a TT Ze lower than around 20ohms so am I to assume the install was incorrect when it was fitted approx 30 years ago?
I certainly would not assume that a 30 year old earth electrode is still as good as the day it was fitted, or even if it was tested at the time.
At that age a trip of some description, either VOELCB or ELCB, would have been required to be fitted by the regs so if it is not present it would suggest that the regs were not adhered to in the first place
The above was not my assumption, the below was:
i would do a mwc, pointing out the lack of RCD protection and submit it with my invoice.
How can you certify it if it is dangerous and non-compliant?
Who said anything about certifying anything safe?
That's what the certificate indicates though. You are certifying that it complies with BS 7671 (and is safe).
It says clearly that "I certify... that the electrical installation work is in accordance with BS 7671:2008 as amended to 2015".I have to disagree with you on this. The very should specifically say that the circuit does NOT comply.
It says clearly that "I certify... that the electrical installation work is in accordance with BS 7671:2008 as amended to 2015".
At the end of the day what should a prefessional do?
1. Issue a MWC with notes in Part 1 and Part 2
or
2. Not issue a certificate?
The correct answer is that you should remove the dangerous non-compliance before carrying out the work and certifying it. What you are connecting up is wholly reliant on the fault protection being present for safety, so it cannot be ignored. Likewise we are required to ensure that earthing and bonding are satisfactory before carrying out works.
Reply to TT system with No RCD in the Periodic Inspection Reporting & Certification area at ElectriciansForums.net
We get it, advertisements are annoying!
Sure, ad-blocking software does a great job at blocking ads, but it also blocks useful features of our website. For the best site experience please disable your AdBlocker.