Installation
61287802F1-34B
33
Revision B
Figure 10. GPON 452/454 Ground Connection
8. Route the ground wire 12” below finished grade by the shortest and most direct route to
the AC power ground system (MGN) of the customer’s premise free of any sharp bends.
(See the
Section 5.3.4.4, “Alternative Grounding Method”
on page 33 if MGN is not
available).
9. Attach the 12 AWG ground wire to the side of the subscriber’s premise with stainless
steel half moon clamps or tie-wrap the ground to the riser conduit of the buried fiber cable
drop. When using tie-wraps wait until the Local Power Source (LPS) wire run has been
installed and tie-wrap both the ground wire and the LPS wire run to the riser conduit of
the Buried Fiber drop.
10. Clean the MGN connector with emery cloth to insure a stable connection.
11. Coat the connection with a metal corrosion preventative.
12. Connect the ground wire to the ground lug and tighten.
13. Attach a Warning Ground Tag to this grounding connection.
5.3.4.4
Alternative Grounding Method
This section describes an alternative grounding method if MGN is not available.
Article 800-11c of the National Electrical Code (NEC) states for the purpose of grounding the
point of entry for communications wiring and cables should be within 20 feet (6.1 meters) of
the electrical service entry point. Where this is impractical, a separate grounding electrode
should be installed in compliance with Article 800-40-(b)(3) and bonded in compliance with
Article 800-40(c) and (d).
Briefly stated:
■ A copper clad steel ground rod should be driven into the earth at least 8 feet (2.4 meters)
deep.
■ An Earth Resistance Megger Test Set is utilized to determine the resistance of the earth
electrode. The NEC requires this ground rod conduction to earth to be no more than 25
ohms of resistance. If 25 ohms cannot be achieved with a single electrode (ground rod),
a secondary electrode must be used and bonded to the primary electrode using a 12 AWG
copper ground wire.
■ The secondary electrode must be spaced at least 8 feet (2.4 meters) from the primary
electrode.
Ground Bar
Ground Wire
Rubber Grommet
