The submeters we use, we call out in a special made cabinet for the device containment. These have the inline fuses which have special fuse blocks that limit exposure to the live parts. The fuse pops out when you access the fuse through a door in the fuse block. These are very common for small fuses now. At the same time, with the breaker at the panel off, feeding the submeter, the fuses should be unpowered.
The only issues for power at that point in the submeter is from the coils measuring current. I cannot remember if we had in place something for that. Been too long since I looked at the diagram or been in one. I think we may have fused those lines also.
Please note that these are always remote from the panelboard or switchgear they are monitoring.
When design other equipment with fusing, we design them with shut-offs before the fuses to limit exposure to live parts. Safety switches have the barriers on the line side, and with solar because both sides may be powered, you need extra poles (special design, or smart use of existing equipment) to limit the contact.
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Shane
