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#1




Load capacity of 200amp panel
This came up elsewhere and I am just curious about what the answer is.
If someone has a main service panel with a 200amp main breaker, how many amps of service can that panel actually service? I am probably not wording this correctly, but I thought that I remember something about a 200amp main breaker actually being okay for 400 amps of service since there are two separate circuits coming in (a 240volt service split into two 120volt circuits in the panel box). 
#2




Load capacity of 200amp panel
JayB wrote:
This came up elsewhere and I am just curious about what the answer is. If someone has a main service panel with a 200amp main breaker, how many amps of service can that panel actually service? I am probably not wording this correctly, but I thought that I remember something about a 200amp main breaker actually being okay for 400 amps of service since there are two separate circuits coming in (a 240volt service split into two 120volt circuits in the panel box). It all depends on voltage. A 220 amp service can in theory (you are not supposed to use more than 80%) supply 200 amps at 240 volts OR 400 amps at 120 volts or any combination of the above. 
#3




Load capacity of 200amp panel
In article s.com, "EXT" wrote:
JayB wrote: This came up elsewhere and I am just curious about what the answer is. If someone has a main service panel with a 200amp main breaker, how many amps of service can that panel actually service? I am probably not wording this correctly, but I thought that I remember something about a 200amp main breaker actually being okay for 400 amps of service since there are two separate circuits coming in (a 240volt service split into two 120volt circuits in the panel box). It all depends on voltage. A 220 amp service can in theory (you are not supposed to use more than 80%) Not so. You misunderstand the 80% rule. supply 200 amps at 240 volts OR 400 amps at 120 volts or any combination of the above. 
#4




Load capacity of 200amp panel
On Oct 22, 1:19ï¿½pm, (Doug Miller) wrote:
In article s.com, "EXT" wrote: JayB wrote: This came up elsewhere and I am just curious about what the answer is. If someone has a main service panel with a 200amp main breaker, how many amps of service can that panel actually service? I am probably not wording this correctly, but I thought that I remember something about a 200amp main breaker actually being okay for 400 amps of service since there are two separate circuits coming in (a 240volt service split into two 120volt circuits in the panel box). It all depends on voltage. A 220 amp service can in theory (you are not supposed to use more than 80%) Not so. You misunderstand the 80% rule. supply 200 amps at 240 volts OR 400 amps at 120 volts or any combination of the above. Hide quoted text   Show quoted text  plus the 200 amp dual breaker can and will carry a percentage more indefinetely I had a friend who had the largest outdoor light display in the area, the power company loved him checking the legs of his main service, it exceeded 200 amps on either side. he couldnt run his dishwasher, washer dryer, or even a hair dryer as his wife found out when the lights were on.......... her hair dryer blacked out the total home. when his kids got bigger he quit decorating......... but geez it was beautiful 
#5




Load capacity of 200amp panel
On Oct 22, 2:14*pm, " wrote:
On Oct 22, 1:19 pm, (Doug Miller) wrote: In article s.com, "EXT" wrote: JayB wrote: This came up elsewhere and I am just curious about what the answer is. If someone has a main service panel with a 200amp main breaker, how many amps of service can that panel actually service? I am probably not wording this correctly, but I thought that I remember something about a 200amp main breaker actually being okay for 400 amps of service since there are two separate circuits coming in (a 240volt service split into two 120volt circuits in the panel box). It all depends on voltage. A 220 amp service can in theory (you are not supposed to use more than 80%) Not so. You misunderstand the 80% rule. supply 200 amps at 240 volts OR 400 amps at 120 volts or any combination of the above. Hide quoted text   Show quoted text  plus the 200 amp dual breaker can and will carry a percentage more indefinetely I had a friend who had the largest outdoor light display in the area, the power company loved him checking the legs of his main service, it exceeded 200 amps on either side. he couldnt run his dishwasher, washer dryer, or even a hair dryer as his wife found out when the lights were on.......... her hair dryer blacked out the total home. when his kids got bigger he quit decorating......... but geez it was beautiful Hide quoted text   Show quoted text  Aside from the 80% rule, you can't get 400 amps out of a 200amp service. The service consists of two hots, and a neutral. That means with a 200 amp service you can get 200 amps at 240V flowing between the two hots. Or you could get say 150 amps at 240V plus 50 amps at 120V. /In the latter case you have 200 amps flowing on one hot, 150 on the other hot, and 50 on the neutral. 
#6




Load capacity of 200amp panel

#8




Load capacity of 200amp panel
Thanks.
That's what I thought  that 200 amps at 240 volts is basically 400 amps available at 120 volts. Or, for example, if 50 of the 200 amps were for a 240 volt circuit, that would leave 150 amps at 240 which could be 300 amps at 120 volts. "Doug Miller" wrote in message ... In article , wrote: Aside from the 80% rule, Which doesn't apply... you can't get 400 amps out of a 200amp service. Of course you can; it just depends on which circuits are in use. If you're using only 120V circuits, you can get 200A on *each* leg. 200A @ 240V is the same power as 400A @120V. The service consists of two hots, and a neutral. That means with a 200 amp service you can get 200 amps at 240V flowing between the two hots. Or you could get say 150 amps at 240V plus 50 amps at 120V. /In the latter case you have 200 amps flowing on one hot, 150 on the other hot, and 50 on the neutral. Ummm....no. You could have up to 150A at 240V plus *100A* at 120V  and if the loads are distributed evenly across the two legs, the current in the neutral is zero. 
#9




Load capacity of 200amp panel
JayTKR wrote: Thanks. That's what I thought  that 200 amps at 240 volts is basically 400 amps available at 120 volts. Or, for example, if 50 of the 200 amps were for a 240 volt circuit, that would leave 150 amps at 240 which could be 300 amps at 120 volts. One other complicating factor is the 125A max branch circuit limitation. Not an issue in normal residential application of course as few people have single loads over 125A, but something to keep in mind when feeding subpanels. 
#10




Load capacity of 200amp panel
On 20091023, Pete C. wrote:
JayTKR wrote: That's what I thought  that 200 amps at 240 volts is basically 400 amps available at 120 volts. The difference is that you can't run a single 120V load at a full 400 amps. But you could run two different 120V loads at 200 amps. One other complicating factor is the 125A max branch circuit limitation. The only limitation here is in the breakers for your panel. Larger breakers may be available; they often take up more space than normal in the panel, so as to have multiple connections to the same busbar. Cheers, Wayne 
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