I believe that a change needs to be introduced to the verbiage in this section... I just don't know how to properly word it. The way the section is currently worded it is going to require disconnection of the grounded conductor to the supply wiring for the ballast. I can see a problem with this if the grounded conductor is part of a multi-wire branch circuit. If the switch is not attached to a "pig-tail" off of the grounded conductor of the circuit then the grounded conductor being disconnected from the circuit could introduce a hazardous condition. While section 404.2(b) does address this maybe language similar to 300.13(b) could be introduced into 410.73(g) to help alleviate this potential? Looking for suggestions or maybe I am reading too much into this.