The sizing of an electrical panel is based on the total connected load. Most new homes today will use a minimum of 200 amp panel. This size distribution panel will give ample room for expansion in the future. As more and more appliances and larger connected loads appear on the market, distribution panels have gone from 30 to 60 to 100 to 125 and now the standard is 200 amps.
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yes wires is electrical panel
That depends on what you mean by "box in". You must always provide access to an electrical panel.
No, there has to be a three foot clearance in front of the panel. This is so that electricians can work safely on the panel.
power entering to power panel from the feeder is called incomer powersupply
The door cannot open and interfere with the panel. There must be 36" of clearance in front to the panel and 30" to each side.