A. All resistance heating units installed shall comply with the following:
1. In accordance with their individual listings.
2. No part of heater or heaters will be covered or blanketed by a door, draperies, curtains or other combustibles in such a manner as to raise the normal operating surface temperature of the unit.
3. A separate manual disconnect shall be provided for each space heated.
4. Thermostatic control shall be provided in each heated space, except that no individual control shall switch any combination of heaters totaling more than 7 kilowatts.