5 core SWA 120mm pvc cable

westward10 · Sep 4, 2019

Good luck pulling that size of cable over 250m.

davesparks · Sep 4, 2019

buzzer123 said:
The electrician will supply it - well he will put the client on his kew account as long as he pays as the cables not in his budget

got a big reel organised from a mate to help distribute the cable and don't like messing about that why i thought I would ask for help.

This still doesn't make much sense to me, if its left to the client to arrange the supply of the cable then it really does suggest that the contractor is not used to doing this kind of work or using this size of cable.

What do you mean by a big reel? You're going to need to be careful how the cable is pulled in or laid as it is surprisingly easy to damage big armoured cable when doing this.
Cables can be damaged by pulling too hard on them and by incorrect attachment of the pulling rope, cable manufacturers will state the maximum pulling force and method of attaching the rope.

Are you aware that the cable needs to be laid in soft sand to avoid damage to the sheath, marker tape or tiles will need to be installed and sheath tests will need to be done to ensure that no damage has occurred to the sheath during laying the cable.

westward10 · Sep 4, 2019

The reality will hit home when a low loader arrives with the cable.

Robson689 · Sep 4, 2019

westward10 said:
The reality will hit home when a low loader arrives with the cable.

At least 3 tonnes of cable I reckon

buzzer123 · Sep 4, 2019

davesparks said:
This still doesn't make much sense to me, if its left to the client to arrange the supply of the cable then it really does suggest that the contractor is not used to doing this kind of work or using this size of cable.

What do you mean by a big reel? You're going to need to be careful how the cable is pulled in or laid as it is surprisingly easy to damage big armoured cable when doing this.
Cables can be damaged by pulling too hard on them and by incorrect attachment of the pulling rope, cable manufacturers will state the maximum pulling force and method of attaching the rope.

Are you aware that the cable needs to be laid in soft sand to avoid damage to the sheath, marker tape or tiles will need to be installed and sheath tests will need to be done to ensure that no damage has occurred to the sheath during laying the cable.

Borrowing a trailored reel dispenser will tow with my 100hp tractor......was going to bury in soil thought armoured was tough......now your worrying me....will ascertain installation specs when cable is purchased so I do not f**k it up - thanks for the heads up
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was hiring a 13 ton machine for the second week to install the gate but looks like I may need a bigger boat

davesparks · Sep 4, 2019

buzzer123 said:
Borrowing a trailored reel dispenser will tow with my 100hp tractor......was going to bury in soil thought armoured was tough......now your worrying me....will ascertain installation specs when cable is purchased so I do not f**k it up - thanks for the heads up

Armoured is tough in some ways, and not in others.
It can take a fair whack of an impact without suffering any damage, but drag it over a sharp object and the outer sheath can quickly be broken.
The biggest danger at installation is the outer sheath being damaged as water will get in even the smallest gap and the armour will rot away in a very short time.

buzzlightyear · Sep 4, 2019

I would go for a speaclist company for laying it , it amaze me when peaple say i will do it me self save the cost get some body in .

buzzer123 · Sep 5, 2019

buzzlightyear said:
I would go for a speaclist company for laying it , it amaze me when peaple say i will do it me self save the cost get some body in .

With the greatest of respect Buzz - I am getting someone in to do live up the wire - I am a groundworks professional and installing a cable into a trench is not exactly testing i will be carefull and walk the trench to ensure there is nothing sharp in there - following davesparks advice i will now encase the cable in sand for belts and braces approach.
When I spoke to power networks guy he said they did not bother as the armoured was bulletproof and could just throw it in the trench and refill with the soil.
The ground here is clay with occasional flints so I will use sand.

westward10 · Sep 5, 2019

Have you got plenty of cable rollers to prevent drag.

Bobster · Sep 5, 2019

westward10 said:
Have you got plenty of cable rollers to prevent drag.

Definitly need rollers on this job.

Using even 200m of 4 core 120mm (can't find the weight for 5 core) cable will weigh just over 1480kg.

Not just damage caused by catching debris in the trench. At that weight, pulling with a tractor without rollers will likely stretch and damage the cable anyway.

Wilko · Sep 5, 2019

westward10 said:
Good luck pulling that size of cable over 250m.

Quick look at 5 core 120mm says over 9 ton per km. So a bit more than Wilko can manage before breakfast.

[ElectriciansForums.net] 5 core SWA 120mm pvc cable

westward10 · Sep 5, 2019

Rob said:
Definitly need rollers on this job.

Using even 200m of 4 core 120mm (can't find the weight for 5 core) cable will weigh just over 1480kg.

Not just damage caused by catching debris in the trench. At that weight, pulling with a tractor without rollers will likely stretch and damage the cable anyway.

End up being 95mm at the tractor end.
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In all fairness to the OP if you have all the correct equipment let us know how it goes.

buzzer123 · Sep 5, 2019

Rob said:
Definitly need rollers on this job.

Using even 200m of 4 core 120mm (can't find the weight for 5 core) cable will weigh just over 1480kg.

Not just damage caused by catching debris in the trench. At that weight, pulling with a tractor without rollers will likely stretch and damage the cable anyway.

Thanks Rob- yes have got a roller organized

Bobster · Sep 5, 2019

buzzer123 said:
Thanks Rob- yes have got a roller organized

You'll need more than 1.

You'll need to position them along the length of the run.

Multiple of something like this:
http://i.Upload the image directly to the thread.com/OPrit2S.jpg

Spoon · Sep 5, 2019

Rather than pull the cable from a stationary drum and pull it over numerous little rollers wouldn't it be better to move the cable drum along the trench and unwind the cable directly into it? No need for little rollers then..

5 core SWA 120mm pvc cable

westward10

davesparks

westward10

Robson689

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buzzer123

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davesparks

buzzlightyear

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buzzer123

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westward10

Bobster

Wilko

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westward10

buzzer123

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Bobster

Spoon

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