Heat tape crosing a boundry

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jmargolis79

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I have a need for heat tape in a class I Div I group D locations. Only some of the heat tape will be in div I. The rest of the heat tape and the power conn. and end seals will be in Div II. the heat tape is reated for Div I and the conns are for Div II.
My question is when crosing from div I to II whould you need to break the heat tape and add a seal off?
 
jmargolis79 said:
I have a need for heat tape in a class I Div I group D locations. Only some of the heat tape will be in div I. The rest of the heat tape and the power conn. and end seals will be in Div II. the heat tape is reated for Div I and the conns are for Div II.
My question is when crosing from div I to II whould you need to break the heat tape and add a seal off?
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Very few type heat tracing cable is approved for Class I, Div. 1 installation and when they are, they need to be designed by the manufacturer - as the condition of the UL or FM approval - where the isometric design drawing will indicate the boundary and also what needs to be done. Obviously the HT manufacturer will need all sort of design data, process data and full Electrical Area Classification documentation.
 
This link may help a bit,

www.chromalox.com/catalog/resources/PDS-PJ932-HSRL.pdf

Chromalox used to have a book full of installation details they would offer free of charge with an order. I don't recall about the design engineering being free or not but have done it both ways in the past but the old memory cheats on me at times ,so give'em a call . I don't recall the crossing of boundaries being a problem as I believe the heat trace cable is impervious to gas migration.

dick
 
dicklaxt said:
This link may help a bit,

www.chromalox.com/catalog/resources/PDS-PJ932-HSRL.pdf

Chromalox used to have a book full of installation details they would offer free of charge with an order. I don't recall about the design engineering being free or not but have done it both ways in the past but the old memory cheats on me at times ,so give'em a call . I don't recall the crossing of boundaries being a problem as I believe the heat trace cable is impervious to gas migration.

dick
Click to expand...

There is of course another side to that coin,,,,,,,,if the cable manufacturer says do it then you are caught with your pants down if you don't, right or wrong. It's a cruel world.

dick
 
I have worked extensivley with both Tycho (Raychem) and Thermon HT. For these you are not required to install seals at boundary changes. They are sealed at the ends and are pretty much the same as MC-HL in that respect. You do not have to 'break' the cable and then put a seal in because it is sealed at both ends with no breaks between. For instance here is the installation guide for Raychem (Tycho, Pentair, whatever it is called now):

http://www.thermal.pentair.com/Imag...imitingHeatTracing-IM-H57274_tcm432-26557.pdf
 
I am running heat trace in a CL1-Dv2 location, and I have around 20 different places where I need to change over from heat trace to RMC and then back to heat trace again. My question is, do I need seal fittings at every power junction box? If I'm reading the code correctly I don't, but wanted to hear some thoughts.


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As long as the "power junction box" only contains terminals and/or splices seals for the enclosure aren't required.
 
rbalex said:
As long as the "power junction box" only contains terminals and/or splices seals for the enclosure aren't required.
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That's how I read it in the code, but just wanted to hear it from someone else too, thanks !


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