Class II div. 2 splice

[Rich Elec.]

I have a question that the post by DAWGS may be interested in.
I saw an installation that I would like to present. I was not in agreement with the way this installation was done, and I wonder if I was wrong to disagree.
Dust tight J.B.'s were mounted, RMC nipples were used as raceway to take the cables from the cable tray to the j.b.'s. The cables were spliced in the j.b.'s. To make the RMC dust tight, spray foam was sprayed into the RMC.

What are your thoughts on the use of spray foam?

Rich

 

[Rich Elec.]

This installation is also in a coal burning power plant.

 

[petersonra]

I have a question that the post by DAWGS may be interested in.
I saw an installation that I would like to present. I was not in agreement with the way this installation was done, and I wonder if I was wrong to disagree.
Dust tight J.B.'s were mounted, RMC nipples were used as raceway to take the cables from the cable tray to the j.b.'s. The cables were spliced in the j.b.'s. To make the RMC dust tight, spray foam was sprayed into the RMC.

What are your thoughts on the use of spray foam?

Rich

Its cheap and effective. What more do you want?

 

[rbalex]

I?d like to a bit more information on the tray to raceway transition and whether the transition was in a Class II location itself. ?Sealing? in Class II, both Division 1 and 2 [Section 502.15] is pretty straightforward and the foam may have even been overkill if the raceway terminus to the tray was in an unclassified location.; otherwise it would need to be ?permanent and effective? [502.15(1)] since none of the other options [502.15(2)-(4)] appear to apply.

My personal preference is to use 502.15(3) when it is available to me.

 

[DAWGS]

I am also a bit confused about this. I have to install a splice box, can I use a dust tight nema 4X enclosure and meet the sealing requirements in 502.15. My question is not the sealing it is if I can use the 4X enclosure and splice in it. BTW this is Class II Div 2 Group F location.