This article refers to 2011 Code. When designing for a specific permitting authority, make sure you ask which year of code they use - they are different. If you design for the most recent code and the plan checker says that they haven't adopted that code yet, you can generally get an approval anyway by asking for an exception.
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Here's a great walk through of all the steps to size your disconnect. Article is by Mike Holt, who writes on all solar topics.
NEC 690
This article refers to 2011 Code. When designing for a specific permitting authority, make sure you ask which year of code they use - they are different. If you design for the most recent code and the plan checker says that they haven't adopted that code yet, you can generally get an approval anyway by asking for an exception.