600 amp 3 phase service riser conductors and riser.

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IES

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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.

 
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. 

 
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.

 
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