Answer / amit3456

There r so many factors for selection of cable:
1. full load of equipment or load.
2. Length of cable.
3. Derating factor.
4. Insulation level

Answer / ranga

cable size primarily depends on its voltage rating or kW
rating of load. From the kW rating, we can calculate the
current that should be carried by cable and the number of
runs required. we also have to calculate voltage drop
during starting and running in case of a motor load.

Answer / nilkanth

Cable size depend upon the full load current rating.Suppose
current rating is 86A then csble size is 35 SQMM.The
factores are the cunductor size and used cunductor

Answer / ranjan

For sizing of any feeder following are required:-
1. The load for which we are sizing
2.Dearating factor
3.pf
4.Starting voltage drop
5.running voltage drop
6.Spacing/Touching factor
7Effeciency

Answer / d.k.kakade

If cable size calulate on load in Amps.basis then please
give the formula, or advice cable size in 3.3kv 104Amps and
52 Amps,67 Amps, 33 Amps, and 15 Amps load.

Powe engrs.

Answer / sahil>m

Full load current and voltage drop

Answer / eng.yousef

cable size depends on:
1)total connected load via cable.
2)lenght between the source and the load.
3)temprture
4)isulator type
5)load type
6)wiring place& type

Answer / ch.venkateswra rao

first we consider the type of load,voltage
rating,location,power etc will be known after that we
calculate the in put current and 20% extra value will be
added to that currnet and based on that current we refer
the cable manufacture booket and select the suitable size
of the cable

Answer / rathinam

My point of view, To find the cable size need to divide the
LOAD CURRENT by 3.
i.e:
Cable size= Load current (10A)/ 3
= 3.3
Now the answer is 3.3, But we don't have the 3.3 size of
cable. so we can choose next related size of cable, which
is 4 sq.mm.

Answer / manishhctm

A) Firstly we have to check for wht type of system we require the cable i.e LV, MV, HV AND EHV
B) then we have to calculate first: the rated current required by load on 3phase or 1phase system i.e

1) For 3-Phase System
KVA= KW/SQRT3*PF
2) For 1-Phase System
KVA=KW/PF

C) In companies there is feeder schedule for every type of cable w.r.t the amp.

Enjoy!

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