Cable Trays in Class 1 Div 2 area
Cable Trays in Class 1 Div 2 area
(OP)
I'm having a heated discussion on this. The question is if I am using cable tray, and Type TC cable, is there some special sealing required at the boundary between the Class 1 Div 2 area and the non-hazardous area. My take is "No" if it's ladder tray, and I don't know what happens if its solid tray. The only sealing is at the enclosure the cable terminates at. Any opinions or links to discussion areas.






RE: Cable Trays in Class 1 Div 2 area
RE: Cable Trays in Class 1 Div 2 area
A couple of things to note:
1. Cable Tray is not a raceway per the NEC (it's a support system).
2. UL's standard on Type TC says it has a "gas/vaportight continuous sheath," but is silent on whether it can transmit gases through the core. Assume it can. This is largely irrelevant to the OP, since a boundary seal isn’t mentioned in Subsection 501.15(E)(3).
3. In fact the only mention of a boundary in Subsection 501.15(E)(4) which doesn’t apply to Type TC.
RE: Cable Trays in Class 1 Div 2 area
RE: Cable Trays in Class 1 Div 2 area
There are some method in sealing of penetration;
a)Using a water base hardening compound, ex APEX
b)Using an MCT
c)Using an inert-heat activated sealant, ex RISE System manufactured by Belle Corp.
RE: Cable Trays in Class 1 Div 2 area