On our most recent Wastewater treatment project, we were told by the Inspector that in any Class 1, Div 1 location, Explosion-proof liquid-tight must be used at all motors, heaters, solenoid valves etc. I havent been able to find this in the NEC. Is this required. I know that Appleton makes what they call "flexible couplings" Is this considered Explosion-proof liquid-tight.
Once we are successful in getting a new Wastewater treatment project, we are often invited to the engineering companys last project. On a recent visit to their latest project I noticed that they used regular liquid-tight in a Class 1, Div 1 location. Was this an oversight by that projects Inspector?
Once we are successful in getting a new Wastewater treatment project, we are often invited to the engineering companys last project. On a recent visit to their latest project I noticed that they used regular liquid-tight in a Class 1, Div 1 location. Was this an oversight by that projects Inspector?