I am a trustee for a condo building wherein each unit has its own electricity meter. A few owners wanted to install additional appliances in their units, so I conducted a visual inspection of the current electrical configurations and came across this box in the photo. This box is wired directly to one unit's meter. It stands out from the rest of the electrical boxes (it looks different).
I am looking for feedback here before hiring an electrician (hopefully I will have a better idea of what he is talking about).
Can anyone help me understand what this box is and if it is commonly used?