single conductor cable ampacity
single conductor cable ampacity
(OP)
I been asked to find out how many 240mm² 90°C single conductor cable should be used for a 2150A generator at 690V, according to NEC standard. I normally use IEC standard.
the problem is, that have difficulty to find the ampacity for single conductor cables. The values i find is much lower than the values I find in IEC.
can anyone help me
the problem is, that have difficulty to find the ampacity for single conductor cables. The values i find is much lower than the values I find in IEC.
can anyone help me






RE: single conductor cable ampacity
Also, if this project must meet NEC requirements, you should limit yourself to the 75 deg C temperature rating even though you plan on using 90 deg C insulation. Most equipment and especially terminations are only rated for use up to 75 deg C ratings.
Hope that helps.
RE: single conductor cable ampacity
must tables recarding mm² size to US size says that 240mm² is equivalent to kcmil 500.
If I place the cables with space in between, would that give me a higher rating.
According to the IEC standard 4 conductors pr phase its enough.
Thats why the costumer has asked if the amount of cables could be lower than 6 or 7 conductors according to NEC
RE: single conductor cable ampacity
500 kcm = 620 amps
RE: single conductor cable ampacity
If the conductors are in tray, you'll need to refer to Article 380 to determine the ampacity.
240 mm2 is slightly smaller in cross-section than 500 kcmil, according to the tables I have. From an engineering perspective, they probably equivalent, but you'll run the risk of a local inspector having a different opinion. I'd use the 400 kcmil ampacity and have one less thing to worry about. But that's just me, YMMV.