Furnace wiring question

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Installed a Coleman 17kw furnace in a friends mfg home and have a wiring question. Don't know when the home was built but was surprised to see they had used 10-3 romex on the previous furnace(30 amp) and had wrapped the neutral with red tape. It was being used as a hot conductor. Looked in the panel further and saw two others wrapped with tape the same. Remarking a neutral traveler in a 3 way is one thing but have never seen a neutral taped up in a panel being used as a conductor. Is how they come from the factory...anyone else seen this...

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NEC says it is OK. All you have to do is re identify the wire and they did that with red tape.

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Yep, as long as it is remarked and correct AWG wire, it is perfectly fine and is done often.

I mostly use red permanent marker, tape can come loose, but have used tape as well.

Take care and best wishes,
Robert

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Thanks guys. Just saw the same thing again on an HVAC install. In this case they took black shrink tube and shrinked around the neutral conductors on 10-2 running to a air handler...
can you still get 8-8-8 wire??
my local supply says no

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I believe it is still available in a Large diameter SJ type cord.