Class1 division 2 outside

Status
Not open for further replies.

sevlander

Member
Location
new jersey
I have to rework an outdoor propane filling station. The existing circuit is fed underground in 3/4" RMC stubbing up by the tank with a sealoff 4' above the ground. After the seal there is a Cl 1 div 2 J-box. Above the box is a cl1 div 2 switch. The load side of the switch passes back through the j-box, into a pipe with a seal below the box to a cl 1 div 2 pump motor 10' away in the same area. Is this all that is needed as far as sealoffs? Does this meet all the requirements? From what I read it does. Can I use approved sealtite & fittings at the motor without additional sealoffs? Thanks,Scott
 
It depends on the motor. Not all motors are acceptable in a Class I Division 2 area. If you are using a single phase motor with an integral starting switch, it must be rated for the classification, which means explosion proof, and it will need suitably listed flexible conduit (the expensive stuff). Most TEFC 3 phase motors would be suitable with liquidtight.
 
I have to rework an outdoor propane filling station. The existing circuit is fed underground in 3/4" RMC stubbing up by the tank with a sealoff 4' above the ground. After the seal there is a Cl 1 div 2 J-box. Above the box is a cl1 div 2 switch.

Is there anything between the boundary seal and the ground (the first seal 4 feet above ground)? Nothing is allowed except for a listed explosionproof reducer.

Is the switch/switch enclosure a factory (or hermetically) sealed switch? If not, it needs a seal, and must have Div 1 wiring methods between the switch and this seal.

Are there any arcing, sparking, fuses, relays, etc devices in the Div 2 junction box?
 
A coupling a foot into boundary line goinging to be replaced with a sealoff. Above that the the j-box and switch are rated for the classification, but switch is not intrinsicly safe type. I plan to reuse that design wth a sealoff on the load side of the switch on the out bound side of the j-box before heading to motor. No sealoff at motor. Thanks
 
Looks like you are correct!
Well, actually you were partially right; but the question becomes whether the motor is required to be Class I, Group D or not in the Division 2 location. If it is, then a seal is needed at the motor terminal box; however, explosionproof or not, seal or not, the flexible connection never needed to be explosionproof, if everything was otherwise installed properly.

BTW, explosionproof flexible conduit is an improper term; the proper term is explosionproof flexible coupling. Of course explosionproof itself is improper English but the term is used throughout the NEC.
 
Status
Not open for further replies.
Top