600 amp 3 phase service riser conductors and riser.

[IES]

Building a 600 amp service. 120/208 Volt. What size conductors and riser conduit would be required? Can the conductors be in the same riser or in separate risers. I was thinking 350 MCM in parallel on each supply  leg feeding (4) 350 MCM polaris connectors. The 4" weatherhead only has 7 knock outs in it and I need 8.

 

[kerching]

Well using my powers of psychic deduction you are NOT in Gods own Country ( the UK) but some foreign land.   We don't do 120/208V so I'm guessing your Regs are different to ours so we probably cannot help

but I may well be wrong

 

[Andy™]

something large enough that doesnt melt when its under load of 600a

 

[Evans Electric]

No  doesn't make much sense to either ,  I'm guessing  Mr  IES  is in the US   .....he is of course  most welcome here  but there are some vast differences  between our method and terminology. 

 

[Tony S]

If you’re using taps-offs fr'om the riser then as far as I recall you have to rate the riser for the total fault current. Separate risers then you have to use the NIC tables taking in account separation and support points.