X.L.P.E.

Alasdair Anderson:

Zoomup:

Permanently = always under water.

Z.

Sorry, I wasn't as clear as I could be. I realised you meant always under water but I meant for what life were you wanting it to survive. As Mike says, I would be perfectly happy with it for a few years but if it is planned for several decades then I would be dubious (but then, at the age I am now it would probably outlive me.....)

Right, it is time for me to come clean. I posted the question in an easy to understand way because I was keen to get to work this morning and had limited time to detail things as they are. I am tasked with running an S.W.A. cable in a garden from house to shed. The ground worker, ex. Anglian Water, is keen to use ducting. I was quite happy to bury direct. I suspect that the ducting will fill with water that can not drain away, so the S.W.A. cable will suit in water forever. That was my concern. Apologies for the deception.


 I have just found this......


SWA used underwater is out of spec I believe. Here is a reply from OMS when I asked a similar question 2 years ago:


"Whilst it isn't generally a problem you may be interestaed in the following extracted from Appendix Q of BS 5467:


Q.3.5

Cables specified in this British Standard are not specifically designed for use:

a) as self-supporting aerial cables;

b) as submarine cable or for laying in water-logged conditions;

c) where subsidence is likely, unless special precautions are taken to minimize damage;

d) where any exposure to excessive heat is involved;

e) where the oversheath is subjected to a voltage test after installation.


Note point B.


The problem is generally nicks etc in the sheath which allows the armouring to become saturated which eventually rusts and can force metallic particles through the bedding and insulation to the conductors as it expands.


Ideally you would want an MDPE oversheath or a full blown submarine cable for this application.


Of course you will mark the deviation from BS 7671 on the EIC as the installed cable is utilised outside the scope of the product standard"


Regards

Bruce


Z.

Alasdair Anderson:

Zoomup:

Permanently = always under water.

Z.

Sorry, I wasn't as clear as I could be. I realised you meant always under water but I meant for what life were you wanting it to survive. As Mike says, I would be perfectly happy with it for a few years but if it is planned for several decades then I would be dubious (but then, at the age I am now it would probably outlive me.....)

Right, it is time for me to come clean. I posted the question in an easy to understand way because I was keen to get to work this morning and had limited time to detail things as they are. I am tasked with running an S.W.A. cable in a garden from house to shed. The ground worker, ex. Anglian Water, is keen to use ducting. I was quite happy to bury direct. I suspect that the ducting will fill with water that can not drain away, so the S.W.A. cable will suit in water forever. That was my concern. Apologies for the deception.


 I have just found this......


SWA used underwater is out of spec I believe. Here is a reply from OMS when I asked a similar question 2 years ago:


"Whilst it isn't generally a problem you may be interestaed in the following extracted from Appendix Q of BS 5467:


Q.3.5

Cables specified in this British Standard are not specifically designed for use:

a) as self-supporting aerial cables;

b) as submarine cable or for laying in water-logged conditions;

c) where subsidence is likely, unless special precautions are taken to minimize damage;

d) where any exposure to excessive heat is involved;

e) where the oversheath is subjected to a voltage test after installation.


Note point B.


The problem is generally nicks etc in the sheath which allows the armouring to become saturated which eventually rusts and can force metallic particles through the bedding and insulation to the conductors as it expands.


Ideally you would want an MDPE oversheath or a full blown submarine cable for this application.


Of course you will mark the deviation from BS 7671 on the EIC as the installed cable is utilised outside the scope of the product standard"


Regards

Bruce


Z.