What's Wrong Here?
Jul 16, 2009 10:44 AM, By Joe Tedesco, NEC Columnist
Hint: Missing in action
The NEC requires the location of underground service conductors — not encased in concrete or buried 18 in. or more below grade — to be identified with a warning ribbon placed in the trench at least 12 in. above the underground installation [300.5(D)(3)]. Where the cables are energized at more than 600V, as in this installation, Table 300.50 notes the minimum cover requirements required by the Code.
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