1
5
I
NSTALLATION
How to Seal
Junction
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
top
and
bottom
hubs of the
vertical
conduit. The
fiber rope da m ns w ill surround con duit wiri ng t hat is hous ed
inside the
vertical
condu it.
When both the
top
and
bottom
fiber rope dams have been
pressed into place, sealing compound is poured between the
two and form s into an airtight plu g.
All of thi s is done in
order to preve nt the very real threat of
gas entering the
junction
box and a resulting serious
explosion.
After the unit wir es hav e be en pu l led throu gh the
vertical
conduit the following procedure is required:
•
Turn power o ff at the cir cui t breaker before
proceeding.
•
Place a sm all amount of sealing compound
granules, enclosed, into a clean mixing vessel. Add
s m all am ounts of w ater whil e stirring un til a thick
pas te is formed , then caref ully con tinue adding
sm
aller am ou nts of water until a th ick grav y
consistenc y is achiev ed— NOT WA TERY. Dis card
any material tha t becom es too sti ff to us e.
Never
attempt to r es tore workability by stirring in more
water.
•
Locate
junction
box, back/top-center of unit.
•
Unscr ew con duit do med- cover.
Figure 1: Sealing the
Junction
Box
