While studying a requirement, an apprentice finds an Informational Note printed directly beneath the rule. How does the Code treat that text?
- AIt is a mandatory rule and carries exactly the same weight as the paragraph it follows
Notes carry no enforcement weight at all. Treating a note as a rule leads candidates to pick numbers and methods that the enforceable text never actually requires.
- BIt applies only in jurisdictions that have formally adopted the informative annexes of the Code
Adoption of the annexes is a separate matter and does not convert notes into rules. Notes are advisory regardless of what a jurisdiction has adopted.
- CIt becomes an enforceable requirement once the equipment involved is listed by a testing laboratory
Listing changes nothing about the status of explanatory text. Listing instructions become enforceable through a different rule in Article 110, not through a note.
- It is explanatory material, informational only, and is not enforceable as a requirement
Why D is correct
The Code sorts its own text into three buckets and says so up front: mandatory rules using shall, permissive rules using shall be permitted, and explanatory material presented as Informational Notes. The third bucket is advisory. It explains intent, points to other standards, and gives context, but nothing in it can be enforced as a requirement.
What this question is testing
This checks that you can read the Code as a legal document rather than a textbook, distinguishing enforceable text from commentary. It also quietly tests the mandatory versus permissive split, since candidates who cannot spot shall be permitted tend to treat every allowance as a requirement.
On the job
Notes are where the Code tells you why. A note may point you to the standard a product is built to, remind you that a table has an ambient-temperature basis, or give a formula for voltage drop. Experienced electricians read them constantly because they explain intent and often save a phone call. What you cannot do is write a correction notice against one, or refuse a design because a note suggested something better. When a designer and an inspector disagree, the first question is always whether the disputed sentence uses shall or merely explains.
Memory technique
Shall commands, shall be permitted allows, and a Note only whispers.
Exam tip
Scan for the verb. Shall is a requirement, shall be permitted is an allowance, and anything under the heading Informational Note is advice.
Where to look it up
Article 90 has a short section on mandatory rules, permissive rules, and explanatory material. Read it once; it explains the grammar of the whole book.