Radial Circuit Cable Length

[JohnW2]

There are still thousands of properties in my area supplied from an iron clad cutout containing a 30A BS 3036 fuse.

Interesting, but that seems to be pushing things a bit (today) - do those fuses often blow?

Kind Regards, John

 

[SimonH2]

When I suggested this to the electrician he told me the figures stated for the current carrying capacity of the cable in different installation scenarios was a recommendation only & because all of the run was not within conduit they were not relevant.

And this person claimed to be an electrician did he ?

Personally I would have though it would make little difference if only part of the run was not in conduit as the part of the cable that is inside the conduit will still heat up at the same rate regardless of how much of the cable is not inside the conduit?

Correct.

If you really wanted to have a bit of fun, you could ask him for his calculations. The tables in BS7671 are there to avoid people having to learn how to do the calculations for heating and heat loss for different types of cables in different installation situations. You don't have to follow the guidance - but if you don't then you need to do all the design work yourself.