An underground feeder trench is staked across an occupied industrial site. What must happen before excavation begins?
- Locate utilities and establish the required excavation safety plan
- BBegin digging and stop when a utility is seen
- CUse only the electrical drawing as proof of location for the described C-10 installation and documented operating conditions
- DPlace spoil at the trench edge
Why A is correct
The best answer is: Locate utilities and establish the required excavation safety plan. Utility locating and excavation planning prevent strikes, cave-ins, and unsafe access. Drawings may be incomplete, and spoil at the edge can add surcharge and fall back into the excavation. This transferred field condition tests the same installation or safety principle in a different project context. The other choices conflict with the cited rule, listing, safe-work process, or necessary diagnostic sequence.