Which practice reduces electrical shock hazards from temporary jobsite wiring?

解析

Two things protect a temporary jobsite circuit: ground-fault circuit interrupter protection on every 120-volt, 15- and 20-ampere receptacle that is not part of the permanent wiring, and cords kept out of standing water, out of traffic, and away from the openings that pinch them. The wrong answers are ordinary jobsite habits the standard forbids. Flexible cords must not be run through doorways, windows or holes unless physically protected from damage (a). They must not be fastened with staples or hung from nails, both of which cut the jacket and create a shock path (b). And the cord must be approved for the location: an indoor cord used in wet conditions is not weather-resistant and its jacket admits water (c).