I am familiar that the code says xfrmr secondaries don't have to be protected, i have found that code reference. What i am looking for is a definite answer to is 'can secondaries go right to a load without protection?' Someone wired up a 480v to 110v xfrmr with the secondaries SO cabled into a 4square with a couple of duplexes. I dont think the 20A fuses in front of the primary will blow if there is a fault on the secondary. Any help?