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Depends on the size of the service. 100 amp service will require 3 gauge, 150 amp service will require 1/0 gauge, and 200 amp service will require 3/0 gauge.
120 15 amp service ? 210 7 amp service ?
50 mm or 2 inch will handle the 3/0 wires for a 200 amp service.
You should not load a 125 amp panel any more than 100 amps.
For Service Entrance Cable 600 kcmill (Thousands of circular mils).
Depends on the size of the service. 100 amp service will require 3 gauge, 150 amp service will require 1/0 gauge, and 200 amp service will require 3/0 gauge.
A 200 amp service panel will require a # 4 bare copper ground wire.
Most apartments have a 60 amp panel for their electrical distribution.
As many as you wish, as long as you do cross 200 amp limit
Check the nameplate on the service panel. There it will tell you what the buss capacity is. On a 200 amp service nothing in the wiring configuration is allowed to be less than that the service rating. In the market there are 200 amp 42 circuit distribution panels.
120v /240v
7.75 amps
Yes, but at every reduction in wire size there has to be a breaker sized to the smaller wire size. The wire size for 100 amp panels is recommended at #3 copper conductor. From the 200 amp feeder panel you will require a 100 amp two pole breaker for each of the two 100 amp services. Keep in mind that if you run the 100 amp services close to maximum this will take away the capacity of the 200 amp service for other branch circuits coming off of it. Also keep in mind that if the panels are located, not in the same building as the 200 amp service that the 100 amp panels will be treated as separate services and will have to be constructed like a 100 amp service. This includes ground rods. Also the bonding screw will have to be removed that connects the neutral buss to the panel enclosure.
120 15 amp service ? 210 7 amp service ?
Every bathroom should have its own dedicated 20 amp electrical service breaker. The electrical service breaker should have a surge protector in the case that something electrical falls into water.
50 mm or 2 inch will handle the 3/0 wires for a 200 amp service.
You should not load a 125 amp panel any more than 100 amps.