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A 600 amp service for a residence is not in the normal range of residential wiring. The service will require special metering and installation procedures along with consultation with utility company and the electrical inspector. Most home wiring electricians are limited as to the amount of current their licence will allow them to install. This is usually 200 amps.

Two parallel 350 MCM conductors with an insulation factor of 90 degrees C will give you an ampacity of 650 amps.

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What size service ground is needed for a 350 parallel service?

From the question it is hard to establish whether the service size is 350 amps or the service conductors are 350 MCM in parallel. If the service is 350 amps, the grounding conductor is #3 bare copper wire. Parallel 350 MCM conductors will allow for a 600 amp service. The grounding conductor for a 600 amp service is a #1 bare copper wire.


What is the wire size needed to feed a 400 amp service with parallel copper?

It depends on the length of the run


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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.


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The size of wire for service entrance conductors for a 400 amp 3 phase service could be 500 MCM copper. This is very large size wire and difficult to bend and shape, to connect to terminals in the main disconnect and distribution panel. This problem is solved by using parallel conductors or on higher ampacities triple conductors. Using parallel conductors the wire size would be three ought (3/0) copper.


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