Cable sizing

[vikash]

Sir,

Motor : 430 kw

volt: 415 + or - 5%

Cable required size as per consultant : 4R*240 SQ.MM Al. cable XLPE

Types of starting : vfd 90 mtr from motor

cable tray : ms tray in free air

i dont know how they are taken derating factor In air, cable termination.


Motor name plate details:


Application : Pump

Current : 670 A

Connection : Delta

Enclosure : IP 54

Speed : 2990 Rpm

Duty : S1

Starter type : ABB Make VFD

can anybody send the correct cable sizing for above particular motor or some other example it is very usefull me sir.

Vikash

 

[ibew501ed]

Cable required size as per consultant : 4R*240 SQ.MM Al. cable XLPE

you've got me here... what does 4R mean?

 

[Smart $]

Welcome to the forum, Vikash.

Judging from the information provided, I am curious to know whether this installation even falls under an NEC purview. Sounds more like an IEC installation. Either that or an IEC product being installed in an NEC jurisdiction.

 

[weressl]

Sir,

Motor : 430 kw

volt: 415 + or - 5%

Cable required size as per consultant : 4R*240 SQ.MM Al. cable XLPE

Types of starting : vfd 90 mtr from motor

cable tray : ms tray in free air

i dont know how they are taken derating factor In air, cable termination.


Motor name plate details:


Application : Pump

Current : 670 A

Connection : Delta

Enclosure : IP 54

Speed : 2990 Rpm

Duty : S1

Starter type : ABB Make VFD

can anybody send the correct cable sizing for above particular motor or some other example it is very usefull me sir.

Vikash

The voltage drop will be 0, since the cable length is 0. Seriously you would need cable length to calculate voltage drop.

Rough calc is about 12V drop on a 500' run which is close to the outer limits of a common ABB drive and it would be about 3% which is OK. BUt that is only at 670A. The slower than full speed it runs the less current will there be, but the voltage will also drop. ABB ASD does tricks to compensate for voltage drop.

Mind you that ALL of our voltage calculations are based on 60/50Hz sinusoidal voltage. The higher your carrier frequency is the worse it gets.