Placement / Requirement of conduit seals

[Paulietools]

I am working on a boiler valve train skid that will be located in a Class 1 Div 2 location. I am unsure of the placement of my seals. It appears that seals are required when making the transition from Haz to Non-Haz area however all of my wiring is going to a J-box located on my skid, I am not making any connections to the facility. All of my devices are rated for Class 1 Div 2 and the j-box does not contain any devices only terminal blocks. Where am I required to put seals? At all the devices and the j-box?
If I use ITC cable quick connect connections from all the devices I am pretty sure that I don't need seals at the devices but I would then have a central backbone of conduit where all the quick disconnect cables mate. I am assuming then I would only need one seal where the conduit enters the j-box.

 

[rbalex]

I am working on a boiler valve train skid that will be located in a Class 1 Div 2 location. I am unsure of the placement of my seals. It appears that seals are required when making the transition from Haz to Non-Haz area however all of my wiring is going to a J-box located on my skid, I am not making any connections to the facility. All of my devices are rated for Class 1 Div 2 and the j-box does not contain any devices only terminal blocks. Where am I required to put seals? At all the devices and the j-box?
If I use ITC cable quick connect connections from all the devices I am pretty sure that I don't need seals at the devices but I would then have a central backbone of conduit where all the quick disconnect cables mate. I am assuming then I would only need one seal where the conduit enters the j-box.

Please explain what these mean:
"...I am not making any connections to the facility." and "...ITC cable quick connect connections..."
Also describe your basic wiring methods;i.e., is raceway involved or is it only an ITC system installed per Article 727 inside the Class I, Division 2 location.

My concerns:

• There must still a power connection somewhere between the skid and an external source. It can arc even if it is only control power unless it is Intrincally Safe. (Note - nonincendive can arc under the right conditions)
• Depending on the load characteristics, "quick connects" are inherently arc-making even with Article 727 wiring methods.

 

[Paulietools]

What I mean by not making any facility connections is that all of our wiring is located on our skid only. We are not doing any wiring from our skid to the facility. Since everything we are doing is located in the Class 1 Div 2 environment I don't have any boundary to contend with.
ITC = Instrument tray cable.
We are trying to use quick disconnect fittings on all the devices to make replacement easier and to reduce pipe and wire install time.
Its my understanding that you can use qd technology if you apply a set screw or mechanical device to the QD so that someone has to work at making the disconnection.

 

[rbalex]

Since you have no boundaries to deal with, the only thing left is possible enclosure seals.

If I understand your description correctly, your devices are already suitable for Class I, Division 2 and the junction box has no arcmaking devices. In general, that would indicate no seals are required at all.

However, I'm still concerned with the quick connectors. They would fall under Section 501.105(B)(6). There are several criteria that apply and an Article 727 installation would not be suitable.