Short answer
The primary responsibility for workplace health and safety sits with the person conducting a business or undertaking, commonly called a PCBU.
For electrical safety, this means the business must ensure, so far as is reasonably practicable, that workers and other people are not exposed to electrical risks.
But electrical safety is not the responsibility of one person alone.
Directors and officers, managers, supervisors and workers all have responsibilities within the workplace. Where several businesses share a workplace or activity, their duties may also overlap.
The important point is that electrical safety cannot simply be handed to somebody else and forgotten.