Hope this is the right group. I have an older home with a 60 amp
service. Today for a resedetal home there is either a 100 amp or a
200 amp service that you can have so there isprobably two different
sizes of entrance wire from the street that they would use. My
question is should I be able to upgrade the panel to 100 amp and not
call to have the entrance wire replaced. What size should the wire be
coming from the street for 100 amps
Thanks
Rick
The drop size up to the service point at the mast or eave is up to the
utility. It is usually 2 ga for everything up to 200a. From that point
you have to follow 310.15(B)(6)
100a is 4ga cu 2ga al
200a is 2/0 cu 4/0 al
If the utility has upgraded from the 3 separated strands to twisted
"triplex" it is usually 2ga and OK for 200a.
If you're gonna take the effort to upgrade at all, go with 200A. You'll have
to add a second ground rod anyway, and bring the rest of the service up to
code so the difference between 100 and 200A in terms of effort and cost are
very little. The electric company is responsible for everything up to the
meter base and you own the rest. I recently went through this process and
upgraded a friend's house to 200A with a modern service panel. He had
overhead power so I had to install a new mast with 2/0 copper conductors and
1/0 ground.
This is an international newsgroup.
Please give the location of this residence.
Not all countries, or even parts of them in some cases, have the same
system.
--
Sue
|
|>This is an international newsgroup.
|>
|>Please give the location of this residence.
|>
|>Not all countries, or even parts of them in some cases, have the same
|>system.
|
| Most people who are not in the US or Canada would be surprised at the
| need of anyone to have 200 amp service.
Or even 400 amp or 600 amp. Seen both of those. They were big houses,
so I guess the demand calculations were the driving factor for it. That
and maybe they were electric heat, etc, too.
Just as a matter of interest, what is a typical domestic supply in
Japan, where the Voltage is even lower? Does everything in the home
run on 100V, or is there a higher Voltage available for high power
loads?
|
|> Most people who are not in the US or Canada would be surprised at the
|> need of anyone to have 200 amp service.
|
| Just as a matter of interest, what is a typical domestic supply in
| Japan, where the Voltage is even lower? Does everything in the home
| run on 100V, or is there a higher Voltage available for high power
| loads?
Everything for consumers in Japan runs on 100 volts, or 200 volts if it is
a higher power appliance like a stove. I'm sure they have transformers
available for the occaisional things from North America (120 volts) or
Europe (230 volts). Products from Japan tend to work fine over the range
of 100 to 120 volts, if not all the way from 100 to 240 volts. One exception
of interest would be incandescent light bulbs. I've heard of at least one
person who buys them from Japan and runs them on 120 volts. They burn out
sooner but provide a nicer light for the short time they last. Not what you
would use in hard to reach places. But it could be good for the chair side
reading lamp.
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