Let's see if I can do this right. I will try to copy the web page of the box I am looking at.
http://www.intermatic.com/~/media/files/intermatic/catalog/pages/141.ashx Go to that page and see if it works. It is a deck box with an external grounding/bonding lug. There is discussion as to see if it would be required or is it an option to connect to this lug.
The deck box has an internal #8 which does connect to the #12 cu wire frond the pool light.
