Notes:
1. Where multiple sets of service-entrance conductors are used as permitted
in Section 230-40, Exception No. 2, the equivalent size of the
largest service-entrance conductor shall be determined by the largest sum
of the areas of the corresponding conductors of each set.
2. Where there are no service-entrance conductors, the grounding electrode
conductor size shall be determined by the equivalent size of the
largest service-entrance conductor required for the load to be served.
1
This table also applies to the derived conductors of separately derived
ac systems.
2
See installation restrictions in Section 250-64(a).
"There are very specific calculations required here. Several variables have to be determined. You don't even say whether you have single phase power or three phase.
Do yourself a favor. Be safe AND legal. Pay a few bucks to have an electrical engineer do the calcs for the electrical service entrance conductor sizing."
This is not an answer...it's a waffle.
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A service of 300 amp is an in between size. What the code states is that the next size of ground conductor must be used.
For a 400 amp service a #3 bare copper conductor is to be used for a 300 amp service.
The Proper ground wire is determined based on the size of the main feeder wires.
400Amp single phase dwelling service wire is 400 MCM copper or 600 AL (NEC 310.15(B)(6) Then ground wire is either #1/O Copper or # 3/O Al (NEC 250.66)
For other services see NEC 310.16 for the proper wire size then refer to 250.66 for ground size
#2 AWG copper to water main #6 AWG copper to ground rod
According to 2008 NEC, the min size of the wire is 3 AWG copper or 1 AWG aluminuim.
250 kcmil in copper or 400 kcmil in aluminum.
#6 bare copper wire.
A 200 amp service panel with a 60 amp sub-panel.
Use #10 copper.
#6 wire is needed. If placing the subpanel in a garage at a good distance, it is recommended to also install a seperate ground rod .
250 mcm
#6 bare copper wire.
A 200 amp service panel will require a # 4 bare copper ground wire.
#8 is the size of wire to use for grounding a 100 Amp panel. Green is color used for grounding #8 is code.
200 amp service in chicago uses 3 aught.
On a 200 amp or any size service the ground wire is easily identified. Look in the distribution panel for the neutral bus bar. This is where the service neutral (white wire) is connected to the distribution panel. There you will see a bare copper wire connected to the same neutral bar. This is the ground wire that is connected to the ground rods out side of the house.
In the service distribution panel there are termination points at the top of the panel. Two of the utilities "hot" conductors terminate on the main breaker. The neutral utility termination point is on a terminal block usually off to the side near the main hot terminations. It is in this neutral termination block where the system ground connects from the ground rods to the distribution panel. For a 100 amp panel the wire size will be a #6 bare copper conductor.
You do not use a ground wire in the connection from the meter base to the distribution panel. A bonding wire may be required if the service is using PVC conduit.
AWG 2/0 copper.
Almost any average size home today will requre a 200 amp service panel.
In Canada it is a #6 bare copper conductor that connects the grounding rod or plate to the neutral point in the distribution panel.
A 200 amp service panel with a 60 amp sub-panel.
A conductor used for grounding of the main service should be a single wire. The code book has a table that states the size of ground wire for different service panel amperages.