Rhode Island electrical inspector is saying that a SEU cable that was existing can not be run in a sub panel. The use of this SEU cable is used for the electric range. He said all neutral wires have to be insulated. This all started after I installed a service rated transfer switch. I know anything after the switch is conceded a sub panel. I separated all neutrals and grounds in all the panels. Then he said to me he would except removing the SEU cable put it in a plastic box with a plastic cover. Connect a piece of 6/3 romex using the white of the 6/3 connect that to the neutral of the SEU connect the other two black / red to SEU then run the 6/3 romex to the panel. Cutting off the bare ground at both ends. I said to him if this is the case then I will just white tape it or use white heat shrink. Heat shrink is rated for 300 volt. His reply was NO not expectable.