000
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A 750 MCM copper conductor with an insulation factor of 90 degrees C is rated at 500 amps.
No, because there is not enough information. The voltage is needed.
500
six awg
500 mcm
4 copper
A 200 amp service panel will require a # 4 bare copper ground wire.
A 100 amp residential service requires a size #8 copper wire, it should be insulated in green.
500
six awg
500 mcm
2AWG.
4 copper
2 copper
A 200 amp service panel with a 60 amp sub-panel.
10 guage
For Service Entrance Cable 600 kcmill (Thousands of circular mils).
Yes, the wire size has to be increased. The existing 100 amp service will now probably have a #3 conductor with an insulation factor of 75 or 90 degrees C which is rated for 100 and 105 amps respectively. Increasing to a 150 amp service will use a #1/0 wire size. If you are thinking of an upgrade, skip the 150 amp service and go to a 200 amp panel. New homes are installing 200 amp 42 circuit panels. The extra cost is only reflected in the materials as the labour costs will be the same regardless whether a 150 amp or a 200 amp panel is installed. The wire size for a 200 amp panel is #3/0. With an insulation factor of 75 or 90 degrees C the rating is 200 or 210 amps respectively.
A 200 amp service panel will require a # 4 bare copper ground wire.