I really do hope y'all excuse my ignorance, but ...
... what part of the "switchover" process is this? That is to say ...
... I get that you have to cut to switch over but ... what would come next? Does the new system get spliced in? Is it already wired - pending just the cut? (Thus the speed with which it is done) ...
the new system is already spliced in, but is electrically isolated.
the old system can't be isolated like that so they have to physically cut the wires to it before they electrically connect the new system, which is the switch throw at the end of the cutover.
... what part of the "switchover" process is this? That is to say ...
... I get that you have to cut to switch over but ... what would come next? Does the new system get spliced in? Is it already wired - pending just the cut? (Thus the speed with which it is done) ...