For service sizes of 100 amps and less a #8 bare copper conductor is required.
This answer is taken from the CEC. Table 17 states minimum size of grounding conductors. For a service conductor drawing 400 amps a #3 copper grounding conductor is needed. Also see rules 10-206, 10-700 and 10-812 if you have access to the code book.
The grounding conductor of a service distribution is sized by the ampacity of the service. By just stating the wire size, this does not give this information, as many variables enter into what wires are used depending on length, ambient temperature and insulation factor to name a few.
A 100 amp residential service requires a size #8 copper wire, it should be insulated in green.
hawt
3/0 awg wire
The grounding electrode conductor size chart provides information on the recommended size of the conductor based on the type of grounding electrode and the size of the service entrance conductor.
The equipment grounding conductor table provides information about the size of the grounding conductor needed based on the type and size of the electrical equipment being used.
The equipment grounding conductor chart provides information about the size of the conductor needed to safely ground electrical equipment based on the current rating of the circuit.
This answer is taken from the CEC. Table 17 states minimum size of grounding conductors. For a service conductor drawing 400 amps a #3 copper grounding conductor is needed. Also see rules 10-206, 10-700 and 10-812 if you have access to the code book.
The grounding conductor size chart provides information on the recommended size of the grounding conductor based on the type of electrical system and the maximum fault current that could occur.
The required size of the service grounding conductor for a 350 amp parallel service will depend on the specific installation requirements and local codes. It is recommended to consult with a licensed electrician or engineer to determine the proper size based on factors such as the type of wiring used, the distance between the service entrance and the transformer, and the local ground conditions.
The equipment grounding conductor size chart provides information on the recommended size of the grounding conductor based on the type and size of the electrical equipment being used. This helps ensure proper grounding and safety in electrical systems.
Answer for USA, Canada and countries running a 60 Hertz supply service.CEC states that a #3 bare copper conductor is a common grounding conductor size for a 200 amp service panel and it is the minium size for service raceway and service equipment of 400 amps.
For an 800 amp service with parallel sets of 500 kcmil copper conductors, the grounding electrode conductor size should be based on the largest conductor in the parallel set. The grounding electrode conductor size should be sized based on Table 250.66 in the NEC, which recommends a minimum size of 3/0 AWG copper for 1/0 AWG or larger service-entrance conductors.
For a 400 Amp service with 500 MCM conductors, the minimum size grounding electrode conductor required would be 3/0 AWG copper or 250 kcmil aluminum based on the NEC Table 250.66.
The recommended grounding conductor size for a residential electrical system is typically 6 AWG copper wire.
The grounding conductor of a service distribution is sized by the ampacity of the service. By just stating the wire size, this does not give this information, as many variables enter into what wires are used depending on length, ambient temperature and insulation factor to name a few.