What is This??

I saw this in a panel tonight. It was a 18yr old home in a senior community. There was two wires top lugged into the 200 amp service and the neutral went to the bus bar. Any help would be appreciated.

Thanks,
Chris

Here is the pic… i think…?

Can’t attache pic…

](http://www.nachi.org/tutorials/tutorial.php?width=770&height=480&tutorial=mb-attachments)