Agreed in all above - you need a inspection of what has been done, and probably an education yourself in what is permissable. Possible the old stuff is safe over the new stuff. If the cloth covered cable is grounded, would be less worried about it than type SO cable dropped both by way of dry rot and it not persay
drop cable proper.
Above two are probably certified
stage electricians which I am not, though I would love to re-visit and your local electrical supply shop that is really good and should take care of this or not know enough but needs to. Licenced electrician in your area isn't probably the case in anyone to find for the
stage, but you really do have a good electrical supply
house I remember last time I was there.
Hub of your question locally in both local labor and what's code safe. Start there I think first - though I would love to visit your space. Last time I was in Branson, one of the Osmands I am totally sure stole my 14.4v DeWalt drill. Such a family member totally needed it in not wanting to pay for it while I was installing an Ice Show set. Yes I had a 14.4V cordless drill stolen by one of the Osmand's, and I still want it back. Darned Mormens.
Off month in installing the set, but I was impressed with your local electrical supplier in being able to handle our needs. Love a visit, but think they given your account could arrange something to be worked out. If needed, I'm sure a sales person locally can find a source for replacement
drop cable such as 12/14 that's engineered sufficiently for the purpose. Not just about the
drop cable but all parts in the
system in doing so - this including
cord grips on the
drop.
If nothing else, fabric coated copper wires have not changed much over the years persay in
insulation or ability to continue to use. Problem might become less conductors than needed for including the
ground. Want a
ground in less circuits perhaps. Overall, the old
drop lines even 100 year old, I would think safe given some sections exposed to air should be shortened. Not as worried about the old cable over what's been done.
Yes in seeing 90 year old
drop line cable, it was in rubber for the most part dry rot in
insulation, but overall for my past seeing what you see for
drop line cable, it was fine to work but should be replaced. The more modern stuff will work well, but in an overall sense, what was done years ago, verses the 14/3
drop line later... more suspect about the recent work in not proper.