Unearthed buried armour. C2 or C3

Hi Guys

On a domestic EICR i have come across a 3 core swa cable that loops to various points down the garden where the armour has just been cut back so obviously the armour itself is not earthed. The cable is buried.  I have initially coded it as a C2 but am doubting myself.  Is it immediately dangerous or is a C3 more appropriate.  The installation is TT with 30m/a rcd protection.

Thoughts please

Gary

  • I am not sure that it is an exposed conductive part because it is buried, which is a contradiction in terms.

    I agree the wording of the definitions aren't always helpful - yet we regard a flush steel back box as being an exposed-conductive-part as well as SWA. I guess the point about SWA on a buried cable is that it's there for when a digging tool damages the cable - at that point the armour would be exposed.

       - Andy.

  • Yeah, that's a definite C2. Also, you've got exposed single-sheathed cables there - I don't think the bedding counts as an outer sheath.

  • I am not sure that it is an exposed conductive part because it is buried

    In the pic below (which   may not have seen when he made the statement), it can clearly be seen as an exposed-conductive-part that's not only visible, but open to the touch - in fact, it would be in most installations where the armour is properly terminated in a BW or CW gland.


    I am concerned that if the armour has been stripped back in places, the outer sheath has also been removed. AFAIK, the inner sheath is not intended to be exposed to the elements.

    I agree - and think that, worse, the inner 'sheath' is, actually, not a 'sheath' but bedding material, and therefore could be said there is no mechanical protection for the insulated conductors it surrounds ... which implies the same coding as 'I can see and touch coloured insulation of insulated and sheathed cable outside the enclosure or accessory'?

  • I agree the wording of the definitions aren't always helpful

    No, but as my reply to   above, a picture paints a thousand words, and in this case 's picture shows the armour is clearly visible and exposed to touch, but Chris Pearson hit the nail on the head regards armour being stripped back, revealing the bedding, or 'filler', material surrounding insulated conductors.

  • Yuk! Thank you for the picture, which I had not seen earlier.

    In fairness to the householder (or any other lay person), it is not obvious how to install SWA. At least in this case, the armour might protect against a spade if not a fork.

    Given the L-E reversal, I conclude that there is at least a CPC in the cable.