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Double pole RCBOs in caravan site

lyledunn

I have a caravan site of around 150 static vans plus 20 touring pitches. Each caravan is supplied from a group pillar via an individual 30mA RCBO but it is single pole. Non compliant, yes, but if you had to call the risk, where would you place it?

  • 0

    How confident are you that every park home has a double 30 mA RCD upfront of every circuit within them?

    Is there a higher rated double pole RCD upfront of the group pillar?

  • 0 in reply to Sparkingchip

    I am not confident nor do I think that I should place any reliance on such devices being operational. Some of the distribution circuits do have 300mA S Type devices. A neutral to earth fault left in one van could raise touch voltage to ground on other vans due to connected load. Kids, bare feet, hoses, makes me very uncomfortable about evaluating the risk as tolerable.

  • 0

    If the supply is TT with 2 wires and individual rods at each van, then there is not that much of a risk. to get a high touch voltage on anything other than a van with a fault anyway.

    If the earthing is shared then it is more complex but you would still need a broken neutral to give neutral lift, and an NE fault as well.

    TNS I;d not worry.

    Is the trafo on site ?

    M.,

  • 0

    Thanks Mike. System is TN-S but distribution cables are hundreds of metres with all sorts of dubious connections. Lost the earth somewhere underground at 3 of the pillars so had to TT them. Loss of neutral is the issue but not on the DNO side as tx dedicated and on site. 

  • 0

    I have encountered one broken neutral on an overhead DNO TT supply to two houses in twenty or so years, the upfront 30 mA RCD was tripping in the house I was called out to and would not reset, the incoming neutral tail was live due to it being back fed from next door, these things do happen and are possibly more likely to happen within the site installation itself.

    I don't know how to call this one,. I would expect to see other double pole isolators and RCDs in place, but how reliable they are is questionable, as if they even exist.

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