Answer / santhoshsasidharan

CURRENT DENSITY OF CU=1.2A/MM2
CURRENT DENSITY OF AL=.8A/MM2

FOR EX: DESIGN REQUIREMENT OF 400A MAX.CAPACITY.
CONSIDER THE BUSBAR IS CU.
AREA OF THE BUSBAR=400A/1.2=333.33MM2

APPROX. VALUE= 350MM2

SO THAT, THE STANDARD SIZE IS 50MMX8MM

Answer / md

please give me answer exactly

Answer / khan

Usually busbar sizes selection depends mainly on two
factors. Which is current + temperature. The size which you
are going to select must carry the current you need and
must not create much heat which excess the limits.

Our formula , we use 1.5 A / 1 sqmm.

Answer / jk

Aluminum current transfer capacity :0.8 amps/sq mm
Copper current transfer capacity :1.6 amps/sq mm

Example:640 amps

x= 640 / .8 = 800 sq mm

800/10 (Say 10 mm Width)
L=80 MM, W=10 MM

Answer / jad

Please Give the references........otherwise its very
confusing....!

Answer / renukaswamy

We have consider so many factors to calculate Busbar sizing.
a) Current carrying capacity : for that Copper can go upto
1.6A/Sq.mm and Aluminium is 1A/Sq.mm
b) Ambient temp. and temp. rise to considered.
c) Heat loss to be considered.
d) Short circuit current to be considered.

Answer / dubai

The bus bar size normally for copper 1sqmm=1.25Amp and
aluminium is 1sqmm=0.8Amp

Answer / karim halawa

simply the dinesty of the copper equal 2A/mm2 or 1.5A/mm2
accprding purity of the substance so using mentioned
formula to get size of bus bar .

Answer / gajanan

I want to ask to vijay that is there any relation between
current denesity of copper and material purity.
also is ther any standard which defines the standard
current denesity of material.

Answer / rohit bhardwaj

Thumb rule for copper is 1.25 Amps per sq.mm and for Aluminum 0.8 amps for sq.mm

why armature is placed in stator but not in rotor in synchronous generator ?

2 Answers   Student,

difference btw neutral and ground?

2 Answers   ERG,

why semiconductor fuse used in drive ,not ordinary?

4 Answers   EAP, Essar,

how to compute kvar in substation feeder to improve power factor and sending voltage

0 Answers  

what mean by power factor

2 Answers  

If a motor of 30KW rating &200 mtrs distance from feeder give me the cable size selection calculation?

0 Answers  

How to size fuse? How to size MCB?

0 Answers  

i need bhel question papers.

5 Answers   Bhel,

wht is this amps in power consuption and how can we convert that into consuption hours ? i am a sales executive of a energy saving lamps .

5 Answers   KSEB,

what is the significance of tan&delta and how it performed in power transformer

0 Answers  

what is voltage,current,restance,. what is single phase&three phase motar. what is basic electrical 'farmoulas. what is defirens quetions of electrical maintenance.

2 Answers  

what are trouble functions of transformer?ex. prv trip,oltc,oti,wti.explain detail.

1 Answers