lyle,
We don't actually use a Protective device at the switchboard panel end of the Service Line here.
So really, the Service fuse has to co-ordinate with any of the Sub-circuit fuses.
At the end of the day Lyle, the Service fuse is just a last-resort fuse, it just protects the Service line itself and the metering equipment.
When Electricity was first reticulated here in NZ, a Main Fuse-switch was used, but as installations were upgraded, it was thought un-necessary and the idea done away with.
