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In the CEC only 1/0 and larger conductors can be run in parallel.
The minimum size wire that can be paralleled together stated in the electrical code book is a #3 copper conductor.
Ground is sized based on the size of the feeder wire and not the amps of the service! However, for a 600 amp service 1500MCM copper wire is one option (NEC 310.16) ;therefor, ground wire is 3/O copper (NEC 250.66) or another option is a two sets of 350 MCM copper wire then a #2 copper (since the biggest feeder wire is 350MCM).
For a distribution panel rated at 400 amps parallel runs of 3/0 conductors will do the job.
According to the 2008 National Electrical Code, the smallest wire that can be run in parallel is a 1/0 AWG (American Wire Gauge). If the wire you are using is smaller than a 1/0 AWG, you will need to increase the size of the wire to handle the amperage (Table 310.16 of the NEC).
Service wire for 100 amps requires AWG #3 copper.
1/0 wire
1/0 wire
In the CEC only 1/0 and larger conductors can be run in parallel.
Most lamp wire is parallel #16 conductors.
To answer this question the voltage that will be used has to be known.
Ground is sized based on the size of the feeder wire and not the amps of the service! However, for a 600 amp service 1500MCM copper wire is one option (NEC 310.16) ;therefor, ground wire is 3/O copper (NEC 250.66) or another option is a two sets of 350 MCM copper wire then a #2 copper (since the biggest feeder wire is 350MCM).
Feeder sizes are based on the amperage of the connected load. Once that is found there are tables in the electrical code book that state what the wire size is for that particular amperage.
AWG # 10 wire on 30 amp circuit.
The minimum size wire that can be paralleled together stated in the electrical code book is a #3 copper conductor.
To answer this question a voltage must be given.
The wire size is dependent upon the wattage size of your water heater. The higher the wattage the larger the wire size. A standard 3000 watt heater will use a two pole 20 amp breaker connected to 2C #12 wire.