Can someone show me or direct me to a site that would explain how I would go about calculating the neutral load in a 120/208Y electrical service?

 

Here is one site.

https://www.google.co.uk/amp/www.el...ar-connection-power-voltage-current.html/amp/

In a Balanced system, the Neutral current would be Zero, however there will be phase differences between inductive and capacitive loads,...