what is the cable size for 120A?

[harridnaufal10]

what is the cable size for 120A?

 

[James]

You look a little young to be lifting heavy cables like That!!

what type of cable, how long is it, what temperature will it be used at?

 

[pc1966]

I don't know the regulations in Indonesia where I guess you are based, but normally for us the design aspects are:

• Maximum cable temperature rise and the degree of thermal insulation (open air, in duct, clipped to a wall, covered in insulation, etc) that gives the size needed to keep I^2R heating down to an acceptable level, so setting the current carrying capacity of the cable (ampicity in USA terminology).
• Maximum voltage drop, so combination of cable length, acceptable drop (typically 5%) and cable impedance
• Maximum earth fault loop impedance so the over-current protection device will disconnect fast enough (typically 5s for a sub-main and 0.4s for a final circuit) which needs the supply 'Ze' (earth fault loop impedance) as well as the type of OCPD and cable length.

For short cables you can usually concentrate on just the CCC, but you ought to evaluate all 3 aspects.