The area should be Class 1 Division 2 because the hazardous material is "normally confined within closed containers or systems". Refer NFPA Code 70 (NEC) 500.5 (B) (2) Class 1 Division 2.
In a Class 1 Division 1 the hazardous material is present "under normal operating conditions". Refer NFPA...
I used to work at a fossil fired power plant at a large government owned utility which had a start up boiler feed water pump on a 500MW unit using this configuration. Two 3500HP motors were connected in tandem to the pump. The pump it self was only about one half the physical size of one of the...