What 29 CFR 1910.332 requires (plain English)
29 CFR 1910.332 sets the training requirements that make the electrical safe-work-practice standards (1910.331 through 1910.335) effective. It requires employers to train employees who face a risk of electric shock that is not reduced to a safe level by the installation requirements, so the people who could be shocked understand how to avoid it.
The standard distinguishes qualified persons, those permitted to work on or near exposed energized parts, who must be trained to distinguish exposed live parts, determine their voltage, and know the clearance distances and precautions for the voltages involved. Unqualified persons who nonetheless face a risk must be trained in the practices necessary for their safety. In every case the training must cover the safety-related work practices that pertain to the employee's specific job assignment.
1910.332 is the entry point to Subpart S's safe-work-practice cluster: 1910.333 (selection and use of work practices, including de-energizing), 1910.334 (use of equipment), and 1910.335 (safeguards for personnel protection). Its training duty for the broader workforce complements the electrical-installation standards (1910.303–.308).