NEC Cable Vs IEC Cable
I have faced one problem in selecting cable type and hope to help me. Let me explain it clearly please
I have dont all my calculation ( continues, non continues, demand factor, derating factor, breaker selecting size, correction factor and etc) based on NEC book which is recommended in Project Scope of Work.
Now for selecting cable type.
We all know that table 310.16 contains THHN, THWN, XHHW, RHW cable types with their maximium operating temperature, ambient temperature as well as current carrying capacity.
we know that insulation type has very impact on current ampacity. We could not find THHN, THWN, in afghanistan and around countries.
So, we find one turkish company the cable type is NYY and is based on IEC code. I have also attached the cable catalog. This cable has much more current carrying capacity than the NEC table 310.16.
I have applied all NEC factors on these cable for selecting a cable and sppose cable 70mm2 which has a current ampacity of 228 ampere.
I have a load which contains = 214 ampere final with all factors
I have selected 220 ampere breaker with 70mm2 cable according to cable catalog.
Now I have got comments to use the NEC cable's current capacity.
Eventhough this cable is already approved and submitted
Could anyone check the current capacity of this catalog comparing to NEC cables and advise me.
Is there any engineering or technical problem since Breaker and cable has no problem per catalog.
"Imagination is more important than knowledge."