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Figure 1: Sealing the Killark Box
14
How to Seal Killark® Box Conduit with Fiber and
Sealing Compound to Help Protect Against
Explosions (Explosion-Proof Units Only):
The purpose of the procedure that follows is to build fiber rope
dams on the left and right hubs of the horizontal conduit. The
fiber rope damns will surround conduit wiring that is housed
inside the horizontal conduit.
When both the left and right fiber rope dams have been
pressed into place, sealing compound is poured between the
two and forms into an airtight plug.
All of this is done in order to prevent the very real threat of
gas entering the Killark box and a resulting serious explosion.
After the unit wires have been pulled through the horizontal
conduit the following procedure is required:
• Turn power off at the circuit breaker before proceeding.
• Place a small amount of sealing compound granules,
enclosed, into a clean mixing vessel. Add small amounts of
water while stirring until a thick paste is formed, then
carefully continue adding smaller amounts of water until a
thick gravy consistency is achieved—NOT WATERY.
Discard any material that becomes too stiff to use. Never
attempt to restore workability by stirring in more water.
• Locate silver Killark box, back/top-center of unit.
• Unscrew conduit domed-cover.
Note: Killark® is a registered trademark of Hubbell Incorporated,Shelton,CT,USA.
I
NSTALLATION
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