Coal Processing Facilty

[TLBryant]

What classification would a coal processing facility fall under? The area is not in the mine shaft - on the surface.

Looking to install CCTV to view conveyor and processing equipment. Definatly want the install to be compliant.

They have cheapo cameras with exposed wiring connections now. I think they should be explosion-proof, dust tight, and rigid conduit even though they are low voltage. The cameras will operate at 24 VAC.

 

[rbalex]

When present in particles small enough to create an explosion hazard (420 microns or smaller) coal is Class II, Group F. A visible dust cloud or a layer of dust at least 1/8? thick indicates Division 1. Typically, 10? beyond Division 1 in the direction away from the source is Division 2.

If coal dust, 1/8? thick or more, hasn?t accumulated on the existing cameras, it is not likely they are in a classified location.

In any case, explosionproof equipment is neither necessary nor by itself acceptable for Class II. Dust-ignitionproof may be required; dusttight is usually sufficient.