Here's the setting: Feeder is fused at 400a., Wire size 500 Kcmil.cu, Tap conductors are #3 cu. Can the tap conductors terminate in a "Main Lug Only" panel rated for 100a.?
That would appear to violate Section 480.36.
"408.36 Overcurrent Protection
In addition to the requirement of 408.30, a panelboard shall be protected by an overcurrent protective device having a rating not greater than that of the panelboard. This overcurrent protective device shall be located within or at any point on the supply side of the panelboard."
No, they must be no longer than ten feet and must terminate in an overcurrent protective device rated at not more than the ampacity of the wire being protected on the load side. Said wire ampacity must be at least 20% of the rating of the overcurrent device protecting the conductor that is being tapped.
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