ever seen this before??

brs73 · Jan 3, 2010

hello there
just carried out a pir and found three cookers,each supplied by a 50a mcb but instead of using 6mm/10mm they had twisted 3x2.5 singles together and used theses instead of a single core.
ive been qualified 20 years and i've never seen that before
any thoughts
code 1 i reckon !!!!

Guest123 · Jan 3, 2010

Wonder what the CCC and VD of a 7.5mm cable is???

supasparxs · Jan 3, 2010

brs73 said:
hello there
just carried out a pir and found three cookers,each supplied by a 50a mcb but instead of using 6mm/10mm they had twisted 3x2.5 singles together and used theses instead of a single core.
ive been qualified 20 years and i've never seen that before
any thoughts
code 1 i reckon !!!!

If the circuit was a distribution board supplying 400 amps and the feeders were SWA's then they could be triple feeders.
However for the installation you are discribing I would agree with you and state that is was a class 1

Richard

Darkwood · Jan 3, 2010

Are they within a multicore cable, parallel supplies is acceptable but certain criteria must be met, for example the cables need to be exactly the same length, size and conductor material, how has the neutral been done as it has to match and what is the installation method as this system is usually employed in swa for supplies to dist-boards, large machinery etc to reduce cost and make installation easier.

brs73 · Jan 3, 2010

they're single cables in conduit using the conduit as earth. they've used the same method for the neutrals.
the cable lengths are identical

barx · Jan 4, 2010

Seen tails before were phase was a 16mm double insulated single. Neutral was 16 x 1.5mm singles run together. Suprised me.

MarcT · Jan 4, 2010

That's like the single and split concentric you see see in some rural properties. I've come across some parallel conductors before and naturally you don't like the look of them, but if they satisfy 523.8 then it's more of an orthodoxy issue.