1. No, wrap the mica tape directly around the conductor and then add insulation.
2. To prevent damage to the mica when the insulation is squeezed after wrapping, consider wrapping it with one layer of CV tape (two layers for NA models, one layer for NB models).
3. You can wrap it with a layer of polyester tape to prevent damage to the mica layer.
4. Regarding fire-resistant cables, I have the following opinions: 1. Currently, two layers of mica tape are sufficient for fire-resistant cables, but it is important to ensure that the mica tape is double-sided, with a single layer percentage of at least 30%. 2. As for whether it is necessary to wrap the mica tape with a layer of non-woven fabric or polyester tape, I personally think it is completely unnecessary. 3. There is no longer a distinction between A and B fire-resistant grades. Fire-resistant cables can be divided into fire-resistant and flame-retardant types. Fire-resistant and flame-retardant types are categorized as ZAN-, ZBN-, ZCN-, and ZDN-, while fire-resistant and non-flame-retardant types are simply N-.
