Bob
I would say based on 300.3(B)(1)exception, that the above installation is a violation, and it will definitely cause a heating of the conduit problem. Possibly causing a fire.
300.3(B)(3) does not pertain to paralleled installations.
Even if they had run PVC above grade, that is a violation.
I understand why some like to install a parallel service this way, it makes working with the conductors easier.
Pierre
