Outside feeder taps or 10ft feeder tapd

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hhsting

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Glen bunie, md, us
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Junior plan reviewer
I have electric utility service conductors feeding 1600 amps main serivce disconnect attached to building outside. The load side of service 1600 amps disconnect feeders are tapped in trough located attached to building outside. There are six taps each more than 25 feet long feeding fused disconnects outside attached to same building next to their respective tenants. The six fused discos feed six panelboards inside building one for each tentant.

Question would outside feeder tap rules apply in that case unlimited length feeder taps to fused disco or the fused discos have to be grouped and feeder taps have to be either 10 ft or 25 ft long?
 
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They are are outside so outside tap rules apply. No length limit.

You have a 1600A service disconnect. All the other smaller discos do not have to be grouped.

Each occupancy has a disco and a panel.

Looks good.
 
Lets say outside tap conductor terminate at disco fused at 225A so the outside tap phase conductor ampacity have to be 3/0Awg or 4/0Awg?

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