A pair of thoughts on the topic...
First off, the excerpt from Holt is nice- but misleading. It confuses the maintenance disconnect with the emergency stop. The 'emergency stop' switch is not required for residential tubs, and is a completely separate issue.
Here's a thought: What about having the maintenance disconnect within the equipment compartment of the tub itself?
Of course, the issue may be academic; I've observed many tubs where a simple HVAC disconnect is used - the type with a pull-out tab that the technician can easily put in his pocket. Hard to beat that for LOTO.
