if we know Fault level say 25 KA , How to decide busbar size for Distr

if we know Fault level say 25 KA , How to decide
busbar size for Distribution network of 1000 Amp
Breaker ?
Sample Calculation or Farmula Available or not ?

Question Posted / mr.prashant a.j.

4 Answers
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if we know Fault level say 25 KA , How to decide busbar size for Distribution network of..

Answer / bala

2nos.*60mm*1omm copper bar is enough for 1000amps breaker.
formula is available

Is This Answer Correct ?

13 Yes

9 No

if we know Fault level say 25 KA , How to decide busbar size for Distribution network of..

Answer / ritesh m

When current is high then current density become constant.
You can calculate bus bar size by taking current density 1
J=I/S where j is current density, I current & s cross
section.
Then you can calculate size.

Is This Answer Correct ?

8 Yes

5 No

if we know Fault level say 25 KA , How to decide busbar size for Distribution network of..

Answer / mehul g. c.

if you know the fault level of that area.

then you should find short circuit current.
if you find that then your busbar should be design for that
much short circuit current.

suppose your fault level is 25 ka & then your short circuit
current is 1500 amp. then your busbar should stand safe at
25 ka for 1 or 2 sec until your breaker tripped.

Is This Answer Correct ?

6 Yes

3 No

if we know Fault level say 25 KA , How to decide busbar size for Distribution network of..

Answer / subrata

125mm X 10mm aluminium busbar is enough for 1000a current (25kA)

Is This Answer Correct ?

3 Yes

2 No

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