Wire too big for breaker (roy g)

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We have failed an inspection on 900 amp mcc probably custom made. The inspector said there must be 13" from where feeders enter to lug.
I dont know how valid it was. We moved the main down.
My point is consider all the options you can.
 
kwired said:
Bending space would be a limiting factor to what NEC would let you install, will not change what size lugs are in the breaker used.

The lugs will depend on what breaker is used, there is more then one 400 amp breaker. Just some fairly common examples from the catalog would include the LA/LH series with lugs accepting 1 -600 or 2 - 250's or the LC/LI (which is a 600 amp frame) accepts 2 -500's

At the bottom of the chart is a note telling you to go to a different page for optional lugs, which unfortunately I think sent me to wrong page, but I believe it is sending you to same options as there is for the general use L series breakers you just have the plug on bus end for I line that is not changeable the other end is same as other L series - or for within any other series for that matter.
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Yes, bending space is the issue. UL listing of optional lugs includes wire bending requirements of the NEC. If you notice, when selecting optional lugs your choices are impacted by if the breaker is used as an I-Line versus a 'unit' mount (e.g. breakers in individual enclosures or in custom equipment).The lug data for the current L series of breaker can be found in Digest 176, page 7-42, table 7.88.

The OP specifically said the breaker did not have optional lugs available for 600kcmil, so that is the basis of my answer.
 
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