I can confirm that the Chicago code bears little-to-no resemblance to the NEC. And, I've been in an argument with an electrical inspector there, over code-compliance. And *won*.
The Chicago code is obnoxiously restrictive in some respects -- even the _telephone_ wiring has to be in conduit! And, it is a *swamp* to wade through.
Some section says "you can't do this", but something else, many _pages_ away says "that section doesn't apply *IF* these conditions are met". BUT there is yet another section that says "that exemption doesn't apply under _these_ conditions". etc., etc., ad nauseum.
And they're _all_ 'backward' references -- there's nothing at the "you can't do this" section that contains _any_ reference to those other 'special case' situations. Gotta read *everything* to have any idea of what you can/cannot do in any specific situation.
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