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A 100 amp panel should have a conservatively rated busbar and wiring but this says nothing about your particular panel. If you are asking a question relating to safety it needs to be seen by an electrician.

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Q: How can you find out the bus bar rating in a panel that is old and the rating sticker has fallen off is it safe to say that a panel with a 100 amp main breaker has a bus rated AT 125 AMPS?
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What should the Electrical panel rating be no smaller than?

the main breaker


Can you replace a westinghouse breaker with a GE breaker?

Only if the form factor and specifications are the same. Usually, if it fits and mates with the panel and is the right current and voltage rating, you are okay.


How do you read breaker box amps?

The main breaker will have marking indicating size of electrical service, or if it is a fuse system....the fuses will have current ratings. If it is a subpanel, it might not have a main breaker. In this case you would have to look in the panel that the feed is coming from and find the size of the breaker that is feeding it. In either case you must look for the manufacturer's label that will have the maximum current the panel can handle, make sure the breaker feeding the panel doesn't exceed this rating.


What would happen if a 200 amp breaker is used in a 100 amp sub panel?

There are two things to think about here. First of all a 200 amp breaker will not physically fit into a 100 amp panel. This is so designed because the panel buss is not designed to conduct 200 amps before the current is cut off. A 100 amp rating on the panel is the maximum amount of current that the manufacturer states, that can be handled safely. Second if the 200 amp breaker is in the main panel then everything downstream from that breaker has to be rated for 200 amp conductivity. The wire size will have to be 3/0 from the breaker to the first over current device in the sub panel which will be the sub panel's main breaker. The sub panel can not be a load center but will have to be a combination panel. I doubt that the 100 amp sub panel's main breaker lugs would be large enough to connect the 3/0 cable.


You have an elecwaterheater it blows the20amp in line breaker and the 50 amp main?

For a main breaker to trip under these circumstances the rest of the panel is becoming close to its load rating. When the 20 amps breaker trips the rest of the panel is close to or over 30 amps, the 20 amp breaker takes it over the top. What trips a HWT breaker is usually a faulty heating element. It could be the top one or the bottom one.

Related questions

What should the Electrical panel rating be no smaller than?

the main breaker


What is the rating of the main circuit breaker of the 60kw power distribution panel?

200 amps


Can you replace a westinghouse breaker with a GE breaker?

Only if the form factor and specifications are the same. Usually, if it fits and mates with the panel and is the right current and voltage rating, you are okay.


How do you read breaker box amps?

The main breaker will have marking indicating size of electrical service, or if it is a fuse system....the fuses will have current ratings. If it is a subpanel, it might not have a main breaker. In this case you would have to look in the panel that the feed is coming from and find the size of the breaker that is feeding it. In either case you must look for the manufacturer's label that will have the maximum current the panel can handle, make sure the breaker feeding the panel doesn't exceed this rating.


What type panel does a 4 pole breaker require?

The panel and breaker have to be of the same manufacturer. This way the breaker will fit into the panel. If the panel has a push in bus bar, the breaker must also be the type to accept the bus bar. If the bus bars in the panel are of the bolt in type then the breaker also has to be a bolt in breaker.


What would happen if a 200 amp breaker is used in a 100 amp sub panel?

There are two things to think about here. First of all a 200 amp breaker will not physically fit into a 100 amp panel. This is so designed because the panel buss is not designed to conduct 200 amps before the current is cut off. A 100 amp rating on the panel is the maximum amount of current that the manufacturer states, that can be handled safely. Second if the 200 amp breaker is in the main panel then everything downstream from that breaker has to be rated for 200 amp conductivity. The wire size will have to be 3/0 from the breaker to the first over current device in the sub panel which will be the sub panel's main breaker. The sub panel can not be a load center but will have to be a combination panel. I doubt that the 100 amp sub panel's main breaker lugs would be large enough to connect the 3/0 cable.


You have an elecwaterheater it blows the20amp in line breaker and the 50 amp main?

For a main breaker to trip under these circumstances the rest of the panel is becoming close to its load rating. When the 20 amps breaker trips the rest of the panel is close to or over 30 amps, the 20 amp breaker takes it over the top. What trips a HWT breaker is usually a faulty heating element. It could be the top one or the bottom one.


Can you load an electrical panel with only 20 amps?

If you mean can you put a single 20 amp breaker in an electric panel, the answer is yes. An electric panel is typically made to handle more breakers with values that add up to more than the rating of the panel on the supposition that you will never draw full load on all breakers. If you do the main breaker would trip. In your case you are under utilizing the panel, but this is not a problem.


What is installing a circuit breaker?

It is inserting a breaker into a service panel.


Can a Siemens breaker push on be a replacement breaker for a Westinghouse breaker?

only if listed in the panel board


Will cutler hammer breaker panel fit a GE breaker?

No, a Cutler Hammer will not work in a GE panel or vice versa.


Can you upgrade a 100A main circuit breaker to a higher amp?

I doubt if the 125 amp breaker will fit into a 100 amp box. This is due to the rating of the box only being rated at 100 amps. If this exchange could be made then the service conductors feeding the box must be upgraded to take the 125 amperage that the breaker will allow on the conductor.