Using armour as cpc

YTSOxford · Jan 21, 2009

Right.
I have added a couple of garden lights onto a radial circuit that is in a garden for a pond etc. However as always the contractor supplies the cable. New board in house, the cable to the pond 2.5mm 3 core swa...up to 17th etc... but i have only been given 2 core swa 1.5mm.

So I am using the armour as the earth in this case, as I remember from 17th update, the tutor saying this is fine. But what I can't get my head around is.... The lights are metal, so terminating at each end, does this not produce eddy currents???

Discuss

mrloy99 · Jan 21, 2009

YTSOxford said:
Right.
I have added a couple of garden lights onto a radial circuit that is in a garden for a pond etc. However as always the contractor supplies the cable. New board in house, the cable to the pond 2.5mm 3 core swa...up to 17th etc... but i have only been given 2 core swa 1.5mm.

So I am using the armour as the earth in this case, as I remember from 17th update, the tutor saying this is fine. But what I can't get my head around is.... The lights are metal, so terminating at each end, does this not produce eddy currents???

Discuss

I thought that eddy currents occurr with single core cables?

kevinreilly · Jan 21, 2009

yeah eddy currents are caused through single core cables bunched separately.Phases on their own and neutrals also.

wet string · Jan 21, 2009

concur with eddies in singles, if memory serves they occur i twins but cancel themselves out, i use the armour as cpc every time, but dont no what to put on cert.for cpc cross section,just put the min required ,1.5 for 2.5 cores etc.

mrloy99 · Jan 22, 2009

wet string said:
concur with eddies in singles, if memory serves they occur i twins but cancel themselves out, i use the armour as cpc every time, but dont no what to put on cert.for cpc cross section,just put the min required ,1.5 for 2.5 cores etc.

I put S or SWA,and put a reference to it in legend.don't know what you are SUPPOSED to do.