Short circuit calculation

[lews123]

Anyone able to help on the following...

Short circuit calculation & current carrying capacity of:

50x10mm2 copper busbar
&
80x6mm2 copper busbar

One for the brain boxes..

 

[Pete999]

Anyone able to help on the following...

Short circuit calculation & current carrying capacity of:

50x10mm2 copper busbar
&
80x6mm2 copper busbar

One for the brain boxes..

I take it the busbars are part of a bus bar chamber, does the information supplied with the chamber not give any details?

 

[lews123]

They are actually on a boat in marine environment, only about 250mm in length. Customer is being pedantic.

 

[Bobster]

Depends on how they are braced and how far the bracing is apart.

Any photo's, I'll be able to give you a good idea.

As for a documented level, the only way of proving it is to test it. Or prove it's built to a type tested design.

 

[westward10]

A rough rule of thumb and assuming you have copper busbars operating at 50° is to allow 1-1.6A for every 1sq mm of copper but so many factors come into play.

 

[marconi]

Could you tell me a little more please?

a. ac or dc?

b. a picture/sketch of the busbar arrangement with distances between centres of each busbar and location of fixings.

c. what energises the busbars? The DNO mains(cutout size A?), a battery (electrochemical type and Ah?), a generator(kVA and prime mover?), a transformer(kVA?).

d. what ventilation do the busbars have?

e. what voltage and frequency?