Is this Motor's Power Rating greater than 1/8 HP, but less than 2.0 HP?
Additionally, is the Blower Motor energized by more than One Source?
Section 430.109(B) allows for the use of the Branch Circuit Overcurrent Device to also serve as the Disconnecting means for Stationary Motors of 1/8 Horsepower (HP) or less.
Section 430.109(C) allows Disconnecting means for Stationary AC Motors - size above 1/8 HP, to 2.0 HP (connected to systems of 300V or less), to be either properly rated Snap Switches or Manual Motor Controllers.
Many small Fractional Horsepower AC Motors will be rated in Wattage, Equivalent to what is found at the Output (Motor Shaft).
If a Motor has a listed True Power Rating of 93 Watts, that would be 1/8 HP.
Any Wattage rating
GREATER-THAN 93 Watts indicates a Motor with an output greater than 1/8 HP.
Consequently, any Wattage rating
LESS-THAN OR EQUAL TO 93 Watts indicates a Motor with an output of 1/8 HP, or less.
Another Section in Article 430 may apply to Compliance is Section 430.102(B), Exception(a)... Where such location of disconnect means introduces increased hazards to personnel.
This would be applicable if the Blower Motor is on the same circuit as the Attic Lighting / General Equipment Service Receptacles.
As mentioned by others, it is a minimal cost involved to include a Snap Switch at the Blower, to serve as a Disconnecting means.
It is almost a "No-Brainer" (Default Installation Concept) for an Installation such as the one described in this Thread
(Exhaust Fan's Blower Motor is controlled from 2 or more Bathrooms).
Since the Exhaust Fan serves more than One Bathroom, the Blower
_SHOULD_ be larger than 1/8 HP, in order to actually move enough Air to be considered an Exhaust Fan!
Regardless of which Bathroom Switch energizes the Motor, the Blower will still have to move the Air from all Bathrooms connected to the Exhaust Fan Assembly - via the connected Ducts.
Note: The above takes in to consideration that the Air Moving System is properly designed...
If the System has "Selective" possibilities - where the Ducts going to the Bathrooms have dampers, which are opened only when the Switch at that Bathroom is Closed, the Motor would be Speed Controlled according to the number of open dampers, yet will be of a full load size in the 1/4 to 1/3 HP range (if not larger).
These final comments are to indicate a Blower which exceeds 1/8 HP, and therefore does not qualify for the Disconnecting means permitted by 430.109(B).
Good luck!!
-- Scott (EE)
