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Why would you want to fuse both the positive and negative side of a 24VDC control circuit?
We have a vendor supplying a control cabinet with a Siemens PLC and some I/O. Power to the cabinet is FLOATING 24VDC. The power goes to several circuits, each with a 5 amp fuse on the supply (+)side and a 5 amp fuse on the return (-) side.
When I asked why they had fuses on the negative side, they said it was because the power supply was floating. Can anyone help me understand why this is a good idea? I can't for the life of me draw a potential fault (or two) that isn't already protected by the positive side fuse.
We have a vendor supplying a control cabinet with a Siemens PLC and some I/O. Power to the cabinet is FLOATING 24VDC. The power goes to several circuits, each with a 5 amp fuse on the supply (+)side and a 5 amp fuse on the return (-) side.
When I asked why they had fuses on the negative side, they said it was because the power supply was floating. Can anyone help me understand why this is a good idea? I can't for the life of me draw a potential fault (or two) that isn't already protected by the positive side fuse.