1.     Treat all underground cables as “energized”  and avoid any contact.

Ref: 1926.960(b)(2)

2.     Visually Inspect from a safe distance – Look for Abnormalities and Defects. 

Examples include:

Broken, cut, or visibility-damaged cables. 

Oil or compound leaking from cables or joints, broken cable sheaths or joint sleeves, hot localized surface temperatures of cables or joints, or joints swollen beyond normal tolerance.  Smoke, flame, spark, or abnormal noise. 

Ref:  R 408.41724, 1926.965(h)

3.     Confirm with/ the Power Company (not the onsite electrician) that the underground cables are free from leaks or damage that could expose workers to electricity.  Get this in writing.

Ref:  1926.950(c)

4.     Avoid exposure to all unguarded live electrical equipment operating at 50 volts or more.  Remain 20 feet away until lines are confirmed de-energized, properly guarded or insulated and protected against damage.

Ref:  R 408.41723.