Large Cable Size Help

[johnboy6083]

Why can't you run AWA that far? For that long a run you'd probably require single point bonding of the armour though.
if this is for flood lighting, I'd refer to the manufacturer for lamp start up data. You could end up in a world of litigation of you underside the cable and lamps drop out when the volts drop!

 

[Knobhead]

You can run AWA but you must run them in trefoil +1 or quadfoil. One end only to be earthed otherwise you will run in to major problems. Therefore a CPC is needed. The mechanical protection needed for AWA is greater. The possibility of sheath damage could render the armouring useless due to corrosion.

You’re best bet is parallel SWA's.

 

[Engineer54]

The first thing you need to determine/decide on, is what loading your going to design this installation for. To me it's pointless to run a cable or cables for 280A, when and if there is more than a good possibility of that load being upgraded to up to 400A in the not too distant future. 400A OCPD's in the way of MCCB's, these can be purchased with adjustable Ir etc, parameters that will cover easily 280A to 400A.