Thermal Effects and Regs

[silentboarder69]

I've been asked to carry out some work in a riser tower of an office. In the riser there are two chimneys (metal, cylinder). The riser is approx five stories high and has a light on each floor. In the riser, the floors are metal grills with a ladder connecting all the floors.

The existing cables, run in metal conduit are faulty, presumeably due to age. Someone has run some new cable, 1.5 t&e grey PVC/PVC, clipped direct as a temporary measure. Does this cable comply with regs? Does this need to be enclosed? The riser doesn't appear to get hot, it's OK standing in it.

Thanks,

Rick

 

[Sparky Ninja]

It would depend mainly on the ambient temperatures, and if this has an effect that would have resulted in a larger conductor being used (Ca rating factor).
If the location is strictly under control of skilled/instructed persons (or competent of course) then it's installation should be acceptable as long as it isn't subject to other forms of external influence.

Consider mutual detrimental influences etc...