Holy cow, guys, I am so busted!
330.30B give me 12" from the box to the first support.
The cable is mounted on the edge of the stud, as it makes an immediate bend to a light. What you can't tell from the pic is that this is in a glorified dog-house used to house a circulating pump for an outdoor pond. The total size of this structure is just a little larger than one of those monster does-everything cordless tool kits :-)
As for the locknut...yup, some more "field engineering." As usual, the parts house not only failed to supply the 'industrial cover' for this 4-11 box, they gave me one with only large knock-outs. Not having the appropriate reducing washers with me, I used a reducing bushing instead, with a locknut both inside and outside the box. The KO's were 1", incidentally.
As for the "listing" issue....to play devils' advocate here....don't they make "blank" covers with KO's punched in them? So why should I not be able to drill a hole? And what is the KO for but to mount things?
