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Section 90.5 addresses language conventions. These very specific wordings are universal throughout the National Electrical Code.
The NEC considers these rules to be permissions rather than requirements, saying "here's something you can do, but you're not necessarily required to" or "here's something that you're permitted to do, but you don't necessarily have to." However, this is dependent on a point of view. To an inspector, these permissive rules may say “here is something you must allow,” or “here is something you may permit but cannot require.”
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