(Webmaster note: This may duplicate an earlier post)
This is a good example of why you should know something about other trades.
This is not an NEC violation; rather, it violates the ASME "Boiler & Pressure Vessel Code."
This job violates training, technique, materials, and certification requirements.
From an engineering viewpoint, the cadweld is hot enough to change the temper of the metal, and introduce a stress riser. It does so in one of the most vulnerable areas- on the flat, near a seam. Even if the tank was filled with water at the time, there are penetration issues.
The ground should have been attached to the tank's foot.
The installer is a Darwin candidate.
