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4. Wiring
Primary Protector (Model 349-2LG MKII)
First, ground the protector be connecting a No. 10 AWG insulated solid copper
wire to the ground stud of each protector. This can be done be stripping off
approximately one inch of insulation and wrapping the bare wire around the ground
stud under the washers and nut.
Using appropriate fasteners, run the ground wire as straight as possible to the
nearest approved ground. See section 3, paragraph 2 for a description of the
approved ground. If a straight run is not possible, each bend must have a radius
of at least nine inches.
Secure the end of the ground wire to the approved ground using a recommended
ground clamp and tag.
Terminate the interbuilding wiring (22-24 AWG copper) on the terminal posts for
each primary protector as shown in Figure 2A, making sure that separate pairs
are used for the voice and data pair wiring.
If the interbuilding wiring is exposed to the possibility of power cross, there must
be a fusible link near the point of entrance. The fusible link can be a 2 foot
(minimum) length of 26 AWG wire, under a metal enclosure or as part of a shielded
cable. If the interbuilding wiring is a cable and the cable has a metallic shield,
the shield must be bonded to the primary protector ground at both ends.
4. Wiring (Cont'd)
Secondary Protector (Model 371-02)
The control unit's secondary protector must be connected to the green wire ground
at the control unit's AC power outlet. Connect a 12 AWG insulated copper wire,
not exceeding 3 ft. in length, from the ground stud of the secondary protector
to the AC outlet's green wire ground.
NOTE: The 3 ft. limit is necessary for the proper protection of the control unit during
a lightning surge.
NOTE: The recommended method for connecting to green wire ground at an AC
outlet is to use the Faceplate Ground Adapter Screw, included with the Protector
Assembly. This replaces the center screw of an AC outlet faceplate, providing secure
attachment for a spade lug to green wire ground. Once installed, check the Faceplate
Ground Adapter Screw for continuity to ground.
The IROB telephone's secondary protector should be connected to the ground
stud of the primary protector (located at the entrance of the building containing
the IROB telephone). Another acceptable grounding point for this secondary
protector, is the green wire ground at an AC outlet located near the IROB telephone.
Connect a 12 AWG insulated copper wire from the secondary protector's ground
stud (Figure 2B) to the chosen grounding point.
The R and G screw terminals on the secondary protector (Figure 2B) are for the
voice pair wiring, and the Y and B screw terminals are for the data pair wiring.
Connect the voice pair and data pair wiring between the secondary and primary
protectors, in each building. Reverse the data pair wires at the Y and B screw
terminals of the IROB telephone's secondary protector. This preserves the polarity
of the data signal. (The voice pair does not need to be reversed, since it is not
polarity sensitive.)
When the wiring of the secondary and primary protectors is complete, connect
the control unit and IROB telephone to their respective secondary protectors using
a four-conductor, six-position modular cord. Route the modular cord from the
secondary protector's RJ11 jack through the opening below the hinged cover, and
close the cover.
When all work is complete, secure the secondary and primary protectors' covers
with a tie wrap or a security wire.
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