Pvc flex underground

[Mikey10695]

Hi all just been to a job where a builder has started a job and left them in the lurch, they have run a 1.5mm flexible cable in a pvc pipe underneath a patio which then comes out through a wall for drive way lighting the run is 5metres, personally I would have done this in swa as In my opinion there is more protection on offer! as the patio is already down they have called me in to connect the lights, im just wanting some advice requarding pvc pipe and running flex underground, what are the regs on this & is there a sufficent cable or specific piping needed for this? Cheers
[automerge]1596463742[/automerge]

Hi all just been to a job where a builder has started a job and left them in the lurch, they have run a 1.5mm flexible cable in a pvc pipe underneath a patio which then comes out through a wall for drive way lighting the run is 5metres, personally I would have done this in swa as In my opinion there is more protection on offer! as the patio is already down they have called me in to connect the lights, im just wanting some advice requarding pvc pipe and running flex underground, what are the regs on this & is there a sufficent cable or specific piping needed for this? Cheers

Am I right in saying they should of used THWN Cable thermal heat and waterproof.
[automerge]1596464026[/automerge]

Hi all just been to a job where a builder has started a job and left them in the lurch, they have run a 1.5mm flexible cable in a pvc pipe underneath a patio which then comes out through a wall for drive way lighting the run is 5metres, personally I would have done this in swa as In my opinion there is more protection on offer! as the patio is already down they have called me in to connect the lights, im just wanting some advice requarding pvc pipe and running flex underground, what are the regs on this & is there a sufficent cable or specific piping needed for this? Cheers

Am I right in saying they should of used THWN Cable thermal heat and waterproof. Buried at 18 inches deep.

 

[James]

Maybe that’s all they had to hand, I prefer a heavy duty string or light rope when leaving a draw wire in ducting

However, if it is indeed protected end to end in a duct then pvc is ok

 

[Mikey10695]

Maybe that’s all they had to hand, I prefer a heavy duty string or light rope when leaving a draw wire in ducting

However, if it is indeed protected end to end in a duct then pvc is ok

Is the Hi tuff pvc flex sufficent do you know?? am I right in saying it must be 18 inches deep

 

[snowhead]

18 inches deep doesn't matter if it's under a concrete or hard surface patio.
It's not likely to suffer thermal damage underground.

 

[davesparks]

What sort of pipe is it? Check the regulations for type of ducting which is suitable for protecting non-armoured cables underground, there is an EN standard that it must comply with.

If the pipe does not comply with this standard then it would need to be a cable with suitable earthed metallic sheath or armour.
[automerge]1596472151[/automerge]

However, if it is indeed protected end to end in a duct then pvc is ok

Only if it is the correct type of duct.

 

[James]

Only if it is the correct type of duct.

agreed, but i was just about to go in to a meeting and didnt have time to look up the number

 

[Mikey10695]

What sort of pipe is it? Check the regulations for type of ducting which is suitable for protecting non-armoured cables underground, there is an EN standard that it must comply with.

If the pipe does not comply with this standard then it would need to be a cable with suitable earthed metallic sheath or armour.
[automerge]1596472151[/automerge]


Only if it is the correct type of duct.

On checking the cable duct does comply, im just wondering the reg on how deep, I was always taught 18 inches but its under a solid patio

 

[davesparks]

On checking the cable duct does comply, im just wondering the reg on how deep, I was always taught 18 inches but its under a solid patio

Are you saying the builder has managed to find and install an appropriate duct? I'm amazed, and if they have then you should be able to pull a more suitable cable in to it.

 

[Mikey10695]

Are you saying the builder has managed to find and install an appropriate duct? I'm amazed, and if they have then you should be able to pull a more suitable cable in to it.

Yes the duct is spot on ?? the cable used is fine on taking specific factors in account, personally if the customer agrees I would like to run swa, The rule of thumb ive always used id a cable should be buried a spade and half deep arpund 18inches however because its a fixed surface people are saying otherwise?

 

[Dustydazzler]

What is a suitable duct...?

 

[davesparks]

What is a suitable duct...?

The regs specify a particular BSEN number.

 

[Mikey10695]

What is a suitable duct...?

Its a 50mm twin walled duct that complys with EN 61386-24

 

[Dustydazzler]

Something like this

50mm Twin Walled Cable Duct - Black | Univolt (FXKVR 50)

 

[Mikey10695]

Something like this

50mm Twin Walled Cable Duct - Black | Univolt (FXKVR 50)

yes, thats what they have used