Who must use ground fault circuit interrupters for protection on construction sites?

Ground fault circuit interrupters (GFCIs) are essential for ensuring electrical safety on construction sites, as they protect personnel from electric shock by interrupting the circuit whenever a ground fault is detected. The requirement for their use encompasses various parties involved on a construction site.

Employers are responsible for implementing safety measures, which includes providing proper equipment such as GFCIs. This is part of the employer's duty to maintain a safe working environment as mandated by OSHA standards.

Employees, who work with electrical tools and equipment, also directly benefit from this protection. It is critical that they use GFCIs to safeguard against accidental electrocution, especially given the often hazardous conditions present in construction work.

Additionally, the term "electrical equipment" in this context also implies that tools and machines used on the construction site should be equipped with GFCIs for added safety.

The choice of "all of these" correctly captures the collective responsibility and necessity of GFCIs for multiple parties—ensuring a comprehensive safety standard is upheld across the site. By mandating GFCI use for electrical equipment, the employer, and employees, OSHA enhances safety measures and reduces the risk of electrical hazards in construction environments.