Junction box w/terminals blocks class 1 div 1

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killer76

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I have an application in a CL. 1 Div. 1 Gr. C,D area, in a enclosure I only have one strip on terminal blocks

as the terminal are not arcing or sparking devise

would a NEMA 4X enclosure be permitted or would I need an NEMA 7 enclosure with seals

I understand that the enclosure must be rated for the area classification is this the reason to install a NEMA 7 enclosure only

and were in the code would I find this information if a NEMA 7 enclosure is required for terminal blocks

I realize that the AHJ would have final decision

thanks
 
Re: Junction box w/terminals blocks class 1 div 1

Originally posted by killer76:

I understand that the enclosure must be rated for the area classification is this the reason to install a NEMA 7 enclosure only
Click to expand...
You just answered your own question. The wiring method has to be rated for the area classification.
 
Re: Junction box w/terminals blocks class 1 div 1

ok with that understood it is the area classification requirements,

so will the enclosure need to have seals installed

thanks
 
Re: Junction box w/terminals blocks class 1 div 1

Originally posted by killer76:
... so will the enclosure need to have seals installed ...
Click to expand...
If it were only as simple as that.

Yes, you could use a NEMA 7 (indoor) box and Seal-offs.

But that might be overkill ($$$) if your wires are for Intrinsically Safe devices and you have I.S. barriers / Isolators (and seal-off at the correct Safe Area /C1D1 junction) in a control room.

Or if your wires are between a simple RTD device and it's transmitter, again, nothing more than a box rated for the environment, not hazardous area rating, might be used.

But if they are for something like a 5HP motor, then I'd say the NEMA 7 box & seals may be needed.

So, please tell us what signals (devices)/voltage/amps the wires attached to the terminals are and any seal-offs / conduit / etc that are planned/used.

BTW: There is a "Hazardous (Classified) Locations" forum here.
 
Re: Junction box w/terminals blocks class 1 div 1

So, please tell us what signals (devices)/voltage/amps the wires attached to the terminals are and any seal-offs / conduit / etc that are planned/used.


in the shelter is a vent fan, a receptacle and an exterior light and interior light, all 120v 20 amp max

the j-box is just a termination point for field connection,

so with no acring or sparking device would i classifiy this as nonincendive devise

it may be best to just add seals, I just wanted to find this in the code were it identifies terminal blocks in this type of application

again I see the block as non arcing or sparking


I know this is done in a class 1 div 2 classification just cant remember the guide in cl 1 div 1

thanks
 
Re: Junction box w/terminals blocks class 1 div 1

killer76,

The junction box is just that,a junction box,the terminal blocks inside of it have no more bearing on the situation than wirenuts do.
 
Re: Junction box w/terminals blocks class 1 div 1

so what you are telling me is that seals are required on the enclosure,

can someone tell me were to find this in the code

thanks
 
Re: Junction box w/terminals blocks class 1 div 1

The box must be rated for Class 1 Division 1 [501.10(A)(3)] and seals are not required unless the raceway size is 2" or larger. [501.15(A)(1).
Don
 
Re: Junction box w/terminals blocks class 1 div 1

See 501.15 (A).

If the box has arcing/sparking devices within it, or has conduits larger than 2" entering it, then seals are required.

The box is required to be approved for Cl 1 Div 1 per 501.10 (A)(3).
 
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