Updating a house to 100 amps
The service size, however, indicates nothing more than the maximum current you can draw through your electrical system at one time.The more high-power electrical fixtures and appliances you have, the larger service size you will need.For example, if you build an addition, or install a sauna and hot tub, you may require a service upgrade to meet the new electrical draws. Even if your home operates safely with a 60 amp service, the problem lies in insuring the home: many insurance companies will not insure a home with a 60 amp service.Home buyers are often informed by a Pillar To Post® home inspector that the electrical system needs an upgrade because the 60 amp service is not insurable.Modern appliances are more plentiful than those from the mid-20th century, and you tend to run more of them more often.Trying to, for example, run a washing machine and clothes dryer at the same time may be impossible in an older house that gets fewer than 100 amps of electrical service.
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aluminum service entrance cable going into a small 100 amp service panel with no main disconnect.
The current owner, who appears to have done the wiring himself, has now installed a new 200 amp panel, with 200 amp main disconnect next to the old 100 amp panel.
He has connected the feed to the new 200 amp panel directly to the main terminal lugs of the old 100 amp panel, eliminated distribution to the house from the old 100 amp panel and essentially made the 100 amp panel a junction box for the 200 amp panel.
All distribution to the house now goes out from the 200 amp panel via the original 100 amp service panel.