I have come across many new builds where they would not meet the requirements at the time of installation.
We have brought this up with the developer / installer,they have mostly quoted best practise guide 4 saying that it's only a C3.
The way I read bpg4 is that it's for coding when the instalation was to a previous edition of the regulations.
What recourse is there in this situation?
Where does Part P stand in relation to this? The latest versionI can find is 2013 which refers to BS7671:2008 incorporating Amendment No 1:2011.
See also here: ESQCR (The Electricity Safety, Quality and Continuity Regulations) and BS7671
Most of the time, the discussion concludes with 'use the latest version of the standard' as there are few cases where the new version is 'less safe' than the previous version.
In practical terms, there are some 'conformity' issues that might conflict, but a reasonable person would normally conclude that a later approach ought to be used. An earlier version of the standard might not permit current products to be considered to be safe in all situations - for example, no EV in 2011 !
(And on EV, if you're working one something that comes under Part S, well isn't there a conflict between AD-S and AD-P if the latest standard is not accepted for AD-P?)
I am sure people had no problem plugging in milk floats long before the IET's ever-changing rules on EV chargers. Or long before the IET, for that matter.
I am sure people had no problem plugging in milk floats long before the IET's ever-changing rules on EV chargers.
No, they wouldn't ... for a number of reasons including the fact that this also preceded ESQCR ...
In addition, it's not simply the 'IET' that determine what's in BS 7671 ... it's a British Standard, developed with consensus of a wide-ranging committee representatives from the industry in the UK just like any other.
I am sure people had no problem plugging in milk floats long before the IET's ever-changing rules on EV chargers
I am not sure milk floats used O-PEN detection by voltage deviation
I am not sure milk floats used O-PEN detection by voltage deviation
Assuming the supply was PME ... the DTI guidance on ESQCR hadn't been published at that time ... it didn't arrive until 2002.
Also, the earth electrode resistances used for PME electrodes used to be 10 Ω, whereas today they are 20 Ω, and I understand there are discussions as to whether to go to 40 Ω.
And finally, in the cases where milk floats were charged outdoors, a much smaller population was exposed to any PME risk, than are exposed to contact with EV today ... never mind when every vehicle is electric !
Such glib "looks to the past" without context and a complete consideration as to what's changed between the "glorious past" and the present, aren't really helpful at all.
I am sure people had no problem plugging in milk floats
I suspect milk float chargers were located at the depot (rather than on the vehicle as with most EVs these days) so likely only +ve and -ve d.c. connections to deal with. I suppose it's possible one pole might be connected to the charger's PE and to the vehicle chassis, but it doesn't seem that likely for relatively low voltage systems (<<120V d.c.) where no ADS would be needed.
In any event the supply was much more likely TN-S in those days and even if PME, there would have been a lot more metallic water and gas pipework to supply multiply redundant parallel paths around any broken PEN.
- Andy.
I am sure people had no problem plugging in milk floats
I suspect milk float chargers were located at the depot (rather than on the vehicle as with most EVs these days) so likely only +ve and -ve d.c. connections to deal with. I suppose it's possible one pole might be connected to the charger's PE and to the vehicle chassis, but it doesn't seem that likely for relatively low voltage systems (<<120V d.c.) where no ADS would be needed.
In any event the supply was much more likely TN-S in those days and even if PME, there would have been a lot more metallic water and gas pipework to supply multiply redundant parallel paths around any broken PEN.
- Andy.
I suspect milk float chargers were located at the depot (rather than on the vehicle as with most EVs these days)
Indeed, and quite possibly under cover. I am not sure that you would have wanted an open-sided vehicle on charge out in a storm all night.
possibly under cover
But well ventilated?
All that H2 from the Lead Acid cells? My/our old physics teacher, Mr Evans, would tell of his war experiences (usually Egypt) of a corporal walking to the battery room, while on they were on-charge, for the comms equipment, carrying a hurricane lantern, and being left without the hut - kaboom. Probably apocryphal, but very "Boy's Own".
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