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

what is diffrence between MH LAMP and HELLOZEN LAMP

1 Answers  

th how could we differentiate between armoured copper and armoured aluminium cable what is the basic application? why we prefer the armoured copper as compared to armoured aluminium.

0 Answers   HMC,

how many types of ratings are there of transformer

5 Answers   Met Trade,

What Happen When We provide Dc Supply to Ac Motor

6 Answers  

How check electrical motor winding.

4 Answers   DRJ ARDE,

tube light how its working.,?

3 Answers  

When the DG is running at the time we can connect to capacitor banK? why it is required or not

1 Answers  

difference b/w series&parallel

4 Answers   ABB,

what is the difference between unarmoured & Flexible cable? How to identified?

0 Answers   Priyanka Electricals,

What is difference between miniture circuit breaker and module case circuit breaker up to 63Amp.

7 Answers   MSPL,

what is the form factor of DC voltage

5 Answers  

why firewall is build up between two transformer (220/11kv,50MVA)?what should be the firewall height?what is the clearance between firewall and transformer?

2 Answers   Siemens, Tous Stadt,