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