electau, on 2012-05-14 06:45:17, said:
16sqmm copper minimum for a run of 30 metres and a max demand of 63A, voltage drop 3% from metering point to the main switchboard. With a max demand of 45A one could use 10sqmm copper for 3% voltage drop. This is for a single phase connection. For a 3 phase and neutral supply the minimum size for a max demand of 45A or 63A per phase will be 10sqmm and 16sqmm copper. Cables run underground should be installed in conduit or an equivalant enclosure and be thermoplastic insulated and sheathed (PVC/PVC). If you use Aluminium conductor you will have to increase the size from 16sqmm to 25sqmm for the same ratings
as I could see, the Gun Fai Fa is using 16 mm2 Aluminium,

One problem, aluminium cabel is not so expensive, but there ist no special underground aluminium cabel with the name NYY.
Using 4 x singel aluminium cabel for underground could be a sollution, but as far as I know, aluminium is getting pretty hot, and if the cabels are very close together, there could be a problem.
So the standart copper cabel 4 x singel cabel in 16 mm2 (100 m roll) is costing about 3.200 Bt,

ok, nobody would check, if 4 singel cabels would come out of the underground, and would be connected with the meter,
don`t know, anybody did this,
but 100 m with 4 singel 16 mm2 copper is 12.800 Bt ./. 100 m NYYY 16 mm2 is 31.000 Bt,
( 100 m with 4 singel 19 mm2 aluminium is about 4.600 Bt)
as far, as I know.
So, taking a NYYY cabel is pretty much of a deal,
if thiefs are cutting again the new cabel at the meter,
connecting it to their pick up,
and doing a rip off.




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