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3-14 Connecting commercial power
Procedure 3-4 (continued)
Connecting earth ground to the ac power pedestal
Action
Step
1
2
AC grounding electrode installation
(typical for a main service entrance panel):
3
4
5
6
7
8
9
10
11
12
AccessNode 323-3001-210 Issue 1.0
Action
Turn all circuit breakers in the ac load box to the OFF position.
Unbolt and set aside the following panels in the ac power pedestal:
•
upper left side cover panel
•
upper right side cover panel
•
primary distribution load box cover panel
CAUTION 1
AC grounding electrode installation
For a main service panel entrance, an ac grounding
electrode system requires bonding to an ac main service
power neutral/ground bus. Consult the local power
company or telco for code restrictions or NEC variations.
Ensure that the ac ground rod or ring (electrode) has been installed per local,
telco, and NEC code requirements.
Measure the ground-to-earth resistance.
Note: The ground-to-earth resistance must be less than or equal to 25 Ω.
Attach a 6 AWG tinned copper wire to the exterior cabinet ground rod.
Route the wire into the cabinet through the 1.25-inch conduit entrance
located in the ac power pedestal.
Route the 6 AWG wire through knockout bushing into the load center.
Attach the grounding electrode to the available grounding bus bar position in
the load box (per NEC 250-23/81/84/91/92).
Remove the top-mounted hub locking collar (see Figure 3-3).
Attach the ac meter socket panel (customer provided) to the power pedestal
hub on top of the power pedestal.
Punch out both the left and right 2.5-inch knockouts located on the bottom of
the meter socket panel.
Align the meter socket against the rear pedestal mounting plate over the hub.
—continued—
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