Cable calc??

[ian.settle1]

Hi guys just looking for a bit of help / advice

i have a 100amp 3 phase isolator tap off connected to a rising bus bar.

im installing a new 16 way 3 phase DB approximately 55 metres away from the isolator.

it will be wired in 4 core armoured on tray, and on its own located with in a ceiling void.

the electrical consultant has indicated to use a 50mm 4 core armoured, I think a 35mm would be fine.

Can any body point me in the right direction for the correct calc?

3 Phase isolator tapped of a busbar then a 55 metre cable run, where is the protection for this cable?

 

[Engineer54]

The OP has stated it's a buildings rising mains bus bar system, so the tap off will be of a Switch Fuse or Fuse Switch arrangement....

 

[Plonker 3]

Why are you questioning the design of the circuit when you have admitted you don't know how to actually carry out cable calls? Have you underpriced the job or looking to make a bit more money on it?

 

[Spoon]

For some reason I don't think the OP is going to reply, as he hasn't posted anything for the last 4 days.