warrenelec
Mechanical
- Oct 31, 2003
- 37
i am working on a new design for an electrical termination box for an resistance element heater. i am using a killark box rated as explosion proof suitable for class 1/ div 1 hazardous areas. the box has a 2" NPT opening in the back of it & a 3/4" NPT opening on the side for rigid conduit attachment(installed by customer). the heater will be flange connected to a holding tank. i am welding a 2" pipe nipple to the flange and epoxy potting the tubular heating elements, whil containing all arcing contacts entirely within the killark enclosure. my thinking is that the 2" NPT potted nipple attached to the box is technically a "sealed conduit connection" so that the arcing contacts are located within the enclosure.
would the enclosure now be considered explosion proof & suitable for class 1 div 1 areas? i apologize if the post is unclear, the link below is a sketch of what i am trying to do. i understand that the entire heater may not be entirely explosion proof due to he possibility of high surface temps, but my concern right now is the just terminal enclosure being rated as explosion proof. all help is greatly appreciated.
would the enclosure now be considered explosion proof & suitable for class 1 div 1 areas? i apologize if the post is unclear, the link below is a sketch of what i am trying to do. i understand that the entire heater may not be entirely explosion proof due to he possibility of high surface temps, but my concern right now is the just terminal enclosure being rated as explosion proof. all help is greatly appreciated.