Hi,

I'm doing some building work and have a trench open and our street is getting fibre in a few months.

I plan to get chorus in to lay their green cable.  I've a couple of meters of trench to dig to get from the existing trench to the front corner where the fibre will come in. 

This involves a 90 degree bend, which i understand should be a sweeping bend, but I'm having great difficulty figuring out the exact dimensions of this 900mm sweeping 90 degree bend so that I can dig an appropriate trench.  Anyone know?

Thanks,
Dan.