I'm redesigning a board made from another person. This board have several AC/DC converters (like Traco TMP07 Series and similar) and some screw connectors to connect external devices. Neither the converters now the devices have any connection to the Earth, though they are all isolated.
The board have two fuses for each converter output: one on the positive line and on on the "negative" (actually the 0V).
I'm wondering if it's worth to have two fuses on the same current path or it's enough to put the usual one on the positive line.