A/C installation "outdoor to indoor" cable query

[Toneyz]

We shouldn't be putting any departures down really. No more SY cables for AC interconnection then?

You have to document why the departure is no less safe than complying with BS7671.

 

[plugsandsparks]

I generally use YY for interconnections, SY is way to hard when you get to the indoor unit, also it looks a mess. Outside the YY generally follows the pipework so i hide it within the overall clump and tape it all up with pipe insulation tape, thereby no UV, mech damage is negligable.
BTW the fixed testing to BS7671 is to the outdoor unit isolator, everything else is MIs.
For multis, i use a outdoor grade Cat5 or 6 between outdoor and indoors as its got a much better sheath.

 

[Spoon]

 

[Amp David]

Why does everyone love sy. I sub to another company and if its not armoured its sy, why i just dont know.

 

[Toneyz]

Why does everyone love sy. I sub to another company and if its not armoured its sy, why i just dont know.

Its easier to install.

 

[Strima]

SY is very good in certain applications and environments. However people tend to use it outside or bury it thinking it's the same as SWA.

It's used a lot in telecoms as it's ideal for use in switch rooms etc. However I have seen some very poor use of this cable, especially outside and I have seen how badly it suffers and degrades.

 

[plugsandsparks]

Best i have seen is SY being used for supply from a generator to a machine , outside on a gravel plant. The cable had to be removed every night because it kept getting stolen. A telehandler was used to transport it to a lock up. They dont last long when used and abused.