Hi all,
I want to run power to some outbuildings. Unlike previous posts I can find, I want to provide power to several different locations via the same spur which complicates the calculations a little. I'll post details when I'm done with the maths in the hope that some kind person will check what I'm planning, but before I do I hoped to answer a couple of quick questions.
Reading various previous posts, there seems to be some uncertainty as to whether to use three core SWA (with earth on the third core and the armour), or whether to use two core and have just the armour as a earth. For the lengths of run involved the price difference is significant, but if there is any real benefit in the extra core I'll pay the money. Looks like I'll be getting the cable is from TLC in case the technical spec of the cable is relevant.
On a related note, just a curiosity really, but can anyone explain why the impendence and maximum current of three core cable is slightly different to two core of the same size?
And why the difference between PVC and XLPE - something to do with how the cable material affects the cable temperature when in use?
Before anyone mentions it - "Part P" does not apply. I live on the Isle of Man, and the nice man from Building Control has just rung to confirm that it has not yet been introduced (so I'd better get my skates on before it is!).
Many thanks,
Jason[/url]
I want to run power to some outbuildings. Unlike previous posts I can find, I want to provide power to several different locations via the same spur which complicates the calculations a little. I'll post details when I'm done with the maths in the hope that some kind person will check what I'm planning, but before I do I hoped to answer a couple of quick questions.
Reading various previous posts, there seems to be some uncertainty as to whether to use three core SWA (with earth on the third core and the armour), or whether to use two core and have just the armour as a earth. For the lengths of run involved the price difference is significant, but if there is any real benefit in the extra core I'll pay the money. Looks like I'll be getting the cable is from TLC in case the technical spec of the cable is relevant.
On a related note, just a curiosity really, but can anyone explain why the impendence and maximum current of three core cable is slightly different to two core of the same size?
And why the difference between PVC and XLPE - something to do with how the cable material affects the cable temperature when in use?
Before anyone mentions it - "Part P" does not apply. I live on the Isle of Man, and the nice man from Building Control has just rung to confirm that it has not yet been introduced (so I'd better get my skates on before it is!).
Many thanks,
Jason[/url]