Rank: Guest 
|
Posted By Safetynut
Does anyone have experience or been involved in HV cables that have been installed at a depth far below one would expect them to be which resulted in an accident or inconvenience to a client which prevented any further work continuing due to the cables location.
A Client is looking to form a reinforced crossing at the footpath for transport to travel cross into a newly developed retail park but has since discovered these cables at 100mm below the footpath and in an incorrect position to that indicated on drawings.
I was wonder whether anyone experienced this and what steps they took with regard to the utility company and hazard the cables present at this depth.
This now has put the contract on hold.
Thanks in advance
|
|
|
|
|
|
Rank: Guest
|
Posted By Catman
Hi Safetynut
Google for the NJUG Guidelines on postioning of cables, it was prepared by the utility companies and is a useful tool to discuss this issue with the utility company.
Cheers
TW
|
|
|
|
|
|
Rank: Guest
|
Posted By Chris Knagg
You need to speek to the relevant utility company in the first instance. 100mm is extremely shallow for High Voltage or even low voltage cables. You will need their advice in respect of how to move them, protect them and re-covering them.
There are some cases where cables or other utilities are redundant and no longer required and may be removed, but only the utilty companies will be able to advise on this.
Note - NJUG is a voluntary code which from experience is not always followed.
|
|
|
|
|
|
Rank: Guest
|
Posted By RP
HSG 47 covers guidelines for avoiding the dangers from underground services.
It is an all too common practice that services are placed at shallow depth. There may be justifiable reasons for this such as the positioning of other services. The National Joint Utilities Group do have guiance on the depth of buried services but not all utilities are members of this group and even those who are do not always follow the advice given. Essentially services should not be positioned in the pavement structure. This is to allow for essential maintenance carried out from time to time. There have been many instances of services being under paving slabs or even within the bitmac layers. I have even seen one passing through a drilled hole in a kerb.
You should Identify who it belong to and also consult with the authority for the area.
|
|
|
|
|
|
Rank: Guest
|
Posted By Robert K Lewis
I have even seen them taken to a shallow depth to avoid a bend in a ready provided duct. It was discovered when the foundations for the boundary wall were being constructed. The operative hit it with the first bite of the shovel. He fortunately was not injured. The first scrape had been down to be excavated with a JCB as the duct was known to be 1.5 metres down.
Moral is that cables can be anywhere within 2 metres of the line and depth shown or even where not shown!
Bob
|
|
|
|
|
|
Rank: Guest
|
Posted By Chas
I was told a story once (purely anecdotal) that there are areas in East London where high voltage cables are buried under layers of concrete at varying depths. The effect of this is that they do not get picked up on CAT scans, resulting in all digging having to be done by hand very carefully in order to expose or work round any cable. I am led to believe that this well known to the utilities because of the high accident rate. Not sure if this is true but to me it is plausible.
|
|
|
|
|
|
You cannot post new topics in this forum.
You cannot reply to topics in this forum.
You cannot delete your posts in this forum.
You cannot edit your posts in this forum.
You cannot create polls in this forum.
You cannot vote in polls in this forum.