DISTRIBUTOR CANNOT BE TRUSTED...

Your latest PDF looks quite sensible to me.

Given the nature of the existing work, where no economy of cost or effort has been overlooked, the incomer may be 185 Aluminium in the wrong sort of lugs  of course, rather than copper, and that would still fit with the 250A incomer fuses, being good for ~ 350A.  It also makes the 400A fuses further up an example of wishful thinking...

If so you could safely thin the bonds a bit, and base it on the 250A fuses.


your proposed  95mm X bonds are probably over the top, but are quite short, which is good. For ease of fitting, and perhaps availability, they could be multiples of something more flexible to work with,  to achieve the same end. (like a few lengths of 10mm or 16mm in parallel.) Again not in UK regs, but a pragmatic hack.


Is the water pump drawing from a well or is it boosting a significant street pressure ?

If the latter I take your point about the lack of a street isolator. Ah, what we take for granted in the UK eh ?.


The lamp test is OK for earth verification, but thinking further, I'd probably have used a live supply from a socket, via an extension lead rather than the bare board. I do realise there is a polarity uncertainty with 2 pin sockets, but that is manageable by trying both ways. And it was very useful to realise what is not earthed. (*)


In the past when faced with toe curling areas of live metal I have been known to use plastic buckets, cut up flat plastic chopping boards and empty yoghurt pots and all sorts of ad-hoc domestic items as insulation of opportunity. I do not know if you ever saw the UK TV program Blue Peter as a kid, but the same creative skills that teach you to make a model light house from a washing up bottle can be re-used (un ?)professionally sometimes. 

We know in a well ordered world, you should not have to do so, but when you are not in a well ordered world the rules change a  bit  ?


Mike.


*You could even have 2 lamps in series and the test probe to the centre - if both come on dim the probe has no earth, one bright one dim good earth and a free polarity indicator  throw in (and half the potential shock voltage.)

Your latest PDF looks quite sensible to me.

Given the nature of the existing work, where no economy of cost or effort has been overlooked, the incomer may be 185 Aluminium in the wrong sort of lugs  of course, rather than copper, and that would still fit with the 250A incomer fuses, being good for ~ 350A.  It also makes the 400A fuses further up an example of wishful thinking...

If so you could safely thin the bonds a bit, and base it on the 250A fuses.


your proposed  95mm X bonds are probably over the top, but are quite short, which is good. For ease of fitting, and perhaps availability, they could be multiples of something more flexible to work with,  to achieve the same end. (like a few lengths of 10mm or 16mm in parallel.) Again not in UK regs, but a pragmatic hack.


Is the water pump drawing from a well or is it boosting a significant street pressure ?

If the latter I take your point about the lack of a street isolator. Ah, what we take for granted in the UK eh ?.


The lamp test is OK for earth verification, but thinking further, I'd probably have used a live supply from a socket, via an extension lead rather than the bare board. I do realise there is a polarity uncertainty with 2 pin sockets, but that is manageable by trying both ways. And it was very useful to realise what is not earthed. (*)


In the past when faced with toe curling areas of live metal I have been known to use plastic buckets, cut up flat plastic chopping boards and empty yoghurt pots and all sorts of ad-hoc domestic items as insulation of opportunity. I do not know if you ever saw the UK TV program Blue Peter as a kid, but the same creative skills that teach you to make a model light house from a washing up bottle can be re-used (un ?)professionally sometimes. 

We know in a well ordered world, you should not have to do so, but when you are not in a well ordered world the rules change a  bit  ?


Mike.


*You could even have 2 lamps in series and the test probe to the centre - if both come on dim the probe has no earth, one bright one dim good earth and a free polarity indicator  throw in (and half the potential shock voltage.)