This is in 225.36

Quote

225.36 Suitable for Service Equipment.
The disconnecting means specified in 225.31 shall be suitable for use as service equipment.
Exception: For garages and outbuildings on residential property, a snap switch or a set of 3-way or 4-way snap switches shall be permitted as the disconnecting means.


So you can use a 2 pole snap switch marked as the disconnect.


Greg Fretwell