7.
Mounting the substation protector.
Mounting the protector is relatively easy. You will need a hard surface, preferably wood, to
mount it upon. Keep in mind that the protector should be separated from electrical wires by
approximately 7 feet. It must be in a place that is accessible to the installer/troubleshooter. Mounting
procedures are as follows--
a. Loosen retaining screw. This holds the cover on.
b. Remove the cover from the bracket.
c. Remove the protector and rubber boot from the bracket.
d. Using a drill, prepare three holes. Use a drill size 1/8 inch if possible and only drill
approximately 1/4 inch deep.
e. Screw 3 3/4 inch No. 10 round head wood screws, Figure 34, into the building. Leave 1/4
inch gap between screw head and building.
f. Place the mounting bracket on the wood screws and tighten the screws.
g. Replace rubber boot. Replace protector on boot.
h. Insert and tighten protector bolt. Do not replace the cover. You are now ready to install the
ground wire and drop wire to the protector. To install the ground wire to the protector, be sure the
ground wire is secured to the ground strap. Bring the other end of the ground wire up through the rubber
boot, see Figures 35 and 36. Remove 1 inch of insulation from the end of the wire so that 1/8 inch of
bare wire is showing when the wire is wrapped clockwise around the screw between the round washers
and the lock washers. The right side of the protector is the ring side and the left side is the tip side.
Tighten the screw.
8.
Protective grounds.
A protective ground is a device which enables unwanted electrical voltages in excess of 300
volts or stray lightning charges to follow a direct path to ground as opposed to following the normal
metallic path to the telephone substation apparatus thus causing injury or extensive damage.
a. Public water systems.
(1) Grounds on a public water system are preferred to any other type of ground.
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