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dorsetsmith



Member Since: 30 Oct 2011
Location: South West
Posts: 4554


Attended HV coarse year ago for work, watch video and then had to work out fault current flowing in transformer Shocked
Post #726473 31st Aug 2018 3:33pm
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Caterham



Member Since: 06 Nov 2008
Location: Birmingham
Posts: 6298
England 2011 Defender 110 Puma 2.4 XS CSW Stornoway Grey
I've worked it out.
fault current is equal to >1kA

never thought about it before but looking at that and the oil catching fire there appears cast resin transformer may have certain advantages?
Post #726489 31st Aug 2018 4:28pm
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Rashers



Member Since: 21 Jun 2015
Location: Norfolk
Posts: 3497
United Kingdom 2014 Defender 110 Puma 2.2 USW Corris Grey
leeds wrote:
apt100 wrote:
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Hence it is illegal to have PME supply at eg caravan parks and marinas. And usually not recommended for supplies to outdoor buildings.





Going OT and just to satisfy my curiosity what is correct/legal/conforms to part 17/18 way of earthing/providing electrical safety at caravan parks?

Just curious as we sometimes plug into outdoor supplies on caravan sites.

How are caravans protected electrically?


Brendan


Ok, it's been a while since I did a Caravan Site, but I believe these should be supplied by a TT earthing system (An RCD for supplementary protection to each supply, a consumers earth electrode and no earth provided by the electrical supply company) in the same way I explained the external building supply should be connected.
Post #726525 31st Aug 2018 7:45pm
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