What size ground do I need?

Table 250.122 Minimum Size Equipment Grounding Conductors for Grounding Raceway and Equipment

Rating or Setting of Automatic Overcurrent Device in Circuit Ahead of Equipment, Conduit, etc., Not Exceeding (Amperes) Size (AWG or kcmil)
Copper Aluminum or Copper-Clad Aluminum*
100 8 6
200 6 4
300 4 2

What size should my ground wire be?

Ground wires for residences typically are made of copper and are #6 (6 AWG) or larger. for 200 Amp services, a #4 grounding electrode conductor (ground wire) is required.

What size ground do I need for #6 wire?

MIN. SIZE OF EQUIPMENT GROUNDING CONDUCTORS (EGC) for Grounding Raceway & Equipment

Rating or setting of Automatic Overcurrent Device (OCPD) in Circuit ahead of Equipment [i.e Circuit Breaker]. Not exceeding (Amps) Size (AWG or kcmil)
40 10 8
60 10 8
100 8 6
200 6 4

What size ground do I need for a 400 amp service?

E3908. 12 Equipment Grounding Conductor Size

RATING OR SETTING OF AUTOMATIC OVERCURRENT DEVICE IN CIRCUIT AHEAD OF EQUIPMENT, CONDUIT, ETC., NOT EXCEEDING THE FOLLOWING RATINGS (amperes) MINIMUM SIZE
100 8 6
200 6 4
300 4 2
400 3 1

What size ground do I need for a 100 amp service?

GROUNDING ELECTRODE CONDUCTOR SIZING (Table 250.66)
Size of Main Panel Copper Conductors Aluminum or Copper-Clad Aluminum
100 Amps #8 AWG #6 AWG
125 Amps #8 AWG #6 AWG
150 Amps #6 AWG #4 AWG

What size ground wire do I need for a 100 amp subpanel?

This is typically a three-wire cable with three insulated conductors plus a bare copper ground wire. The cable must have a wire gauge sufficient to the amperage of the subpanel—a 100-amp subpanel requires #4 copper wires or, more commonly, #2 aluminum wires, for example.

Can a ground wire be too small?

With too-small a ground wire, the breaker cannot magnetic-trip because it cannot flow enough current to hit 10x, because of the too-high resistance of the wire.

What size ground do you need for number 4 wire?

GROUNDING ELECTRODE CONDUCTOR SIZING (Table 250.66)
Size of Main Panel Copper Conductors Aluminum or Copper-Clad Aluminum
125 Amps #8 AWG #6 AWG
150 Amps #6 AWG #4 AWG
200 Amps #4 AWG #2 AWG

What size ground wire is needed for a 60 amp sub panel?

However, some electricians hold the opinion that only 4 AWG wires should be installed for 60 amp breaker panels. They reason that this 60 amp sub panel wire size is the gold standard for 60 amp subpanels. This is because 4 AWG can hold more amperage compared to 6 AWG.

What size ground do you need for a 200 amp service?

#4 AWG

GROUNDING ELECTRODE CONDUCTOR SIZING (Table 250.66)
Size of Main Panel Copper Conductors Aluminum or Copper-Clad Aluminum
125 Amps #8 AWG #6 AWG
150 Amps #6 AWG #4 AWG
200 Amps #4 AWG #2 AWG

What size ground is needed for a 200 amp service?