I encountered this disconnect on the exterior of a farmhouse. There appears to be 200 amp service entrance wire. Then there are 3 service wires tapped under the fuses that go to 3 different 100 amp panels. There are no 100 amp disconnect breakers in these panels. I seem to run into more than one wire tapping off of fuses more in rural areas than in the city. When I talk to electricians about this, they seem to feel this is okay(they also think a double tap on breakers is acceptable as long as the breaker can handle the load and the connection is tight) as long as the load is correct. Is this allowed or correct? Does the same apply with fuses as it does breakers? One wire under one screw unless it is approved for more than one( Square D) Thanks for any repiles in advance.