Class 2 Div 1 Enclosure Selection Help

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Rolson

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I working on selecting an enclosure for a Class 2 Div 1 Group G. It would house a terminal strip for some RTD sensors and an intrinsically safe sensor. The RTDs are currently not intrinsically safe rated or on an intrinsically rated circuit.
Does this need to be in a Class 2 Div 1 rated enclosure do to the voltage potential being under 30 volts and possibally falling under the Power Limited or and ITC cable?
From what I am seeing the enclosure has to have threaded boss connections. Is there product out there to add these to a NEMA 4 Cabinet such as a Meyers Hub.
If there is not is there an enclosure that would fit this application in this environment?
If the system was all intrinsically safe would a standard NEMA 4 enclosure with dust tight fittings work in this application?
Any help or guidance would be appricated.
 
In my opinion, the requirement for a threaded boss requires the threads to be part of the enclosure, not something like a hub that you add to an enclosure.
 
Rolson said:
I wish there was a clarification on this definition in the NEC.
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In this case, boss uses the common definition in Webster’s Collegiate Dictionary, 11th edition which is the NFPA Manual of Style's reference dictionary.

Definition of BOSS:
1a : a protuberant part or body <a boss of granite> <a boss on an animal's horn>
Click to expand...
Note: The basic dictionary at Merriam-Webster.com is identical.

I do not know this to be a fact yet, but I suspect with NEMA's proposed deletion of Type 9 enclosures the requirement for bosses may also be relaxed. In my opinion, bosses probably aren't necessary for Group G, but I would be wary about Group F and insist on them for Group E.
 
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