From first principles I would interpret that a 40 A OCPD might be acceptable on a 2.5 mm² RFC or lollipop circuit, if the CCC of the cable allows. I am open to correction but it seems to me that BS 7671, TABLE 4D5, would allow 2.5 mm² T+CPC cable and a 40 A OCPD to be used 'clipped direct' for...
My reading of the Electrical Safety Council's guide on the matter is that if the OCPD rating is too high to provide protection to the cable then your coding is spot on.
Surely, if redundancy with maximum coverage is required, then 4 circuits that don't follow the whole perimeter would leave large portions of the perimeter without coverage in the event of a fault. If the cameras are intended to watch the inside of the perimeter then this may not be a problem as...
Some leave me quite encouraged that I have something to offer ... and that as a ... I am not quite at the 'bottom of the dung heap'!
That said ... I quite agree that even from some supposed 'sparks', the standard is scraping through the bottom of the barrel!
Google the Beaufort scale, there are descriptions of observable effects of different 'bands' of wind strengths. Also take a look at the Meterological Office web local 5-day forecasts; there is usually a link to the observations of actual weather conditions at your nearest weather observation...
Google the Beaufort scale, there are descriptions of observable effects of different 'bands' of wind strengths. Also take a look at the Meterological Office web local 5-day forecasts; there is usually a link to the observations of actual weather conditions at your nearest weather observation...
Big belly laugh ... we have something in common there ... I fear. Though in my own case I question from time-to-time how generous I really am ... not everyone has the same opinion of me as I do ;o(!
I try to work on the premise of 'To give and not to count the cost ... '.
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