If safety instructions state something SHALL be done, what does this indicate?

When safety instructions state that something "SHALL" be done, it indicates a mandatory action that must be followed to ensure compliance with safety standards and regulations. The term "SHALL" is often used in legal and regulatory contexts to denote an obligation or requirement. This language is intended to convey the necessity of adhering to the directive to promote safety and prevent accidents or injuries.

In contrast, the other choices suggest varying degrees of optionality or suggestion, which do not capture the obligatory nature of the term "SHALL." Therefore, recognizing that "SHALL" establishes a clear and non-negotiable requirement is essential for understanding the importance of following safety protocols in any electrical work or project.