A 200 amp service panel with a 60 amp sub-panel.
3/0 which is pronounced Three Ought.
Use 250 size wire.
A 100 amp residential service requires a size #8 copper wire, it should be insulated in green.
Need to know what size service is going to be installed at the end of the run.
250 mcm
If it is roof drains you are talking about, this calculator may help you: http://www.portalsplus.com/drain_calc.htm
250 MCM aluminum minimum
There is no physical minimum door size - custom doors can be made to any size. There might be building codes for your area specifying what the minimum door size is for a commercial or residential structure, though...
A 100 amp residential service requires a size #8 copper wire, it should be insulated in green.
Need to know what size service is going to be installed at the end of the run.
250 mcm
Please be more specific about 'service'.
50 amps
50 amps
The wire that is used for connecting the ground rod or plate to the electrical distribution is governed by the size of the electriclal distribution. In Canada a #6 bare copper is the minimum size for a 200 amp service.
If it is roof drains you are talking about, this calculator may help you: http://www.portalsplus.com/drain_calc.htm
Supported minimum size
250 MCM aluminum minimum
Minimum size is 36