Can you use a 100 amp breaker for a 125 amp sub panel?

Can you use a 100 amp breaker for a 125 amp sub panel?

Even if not, you can order a 125A main panel and swap the main breaker to 100A. See if you can upgrade the main-sub cable to 125A. If so, order a main panel with thru lugs, which will save 2 breaker spaces, and a 125A sub. Voila, no breakers needed, space maximized!

What size wire do I need for a 125 amp breaker box?

125 amp requires a wire size 2/0.

What size breaker do I need for a subpanel?

Of course this presumes ample spaces in the panel, kinda thing I would do 🙂 I prefer subpanels with main breakers so you don’t have to worry about the rule of 6 and it’s obvious to anyone how to turn it off. Very often people will asume the 2-pole in the upper left is the main breaker.

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What size breaker do I need for a 100 amp sub panel?

20-42 breakers
The number of breakers can max out to 30-42, too, depending on the design of your 100-amp pane. However, NEC prohibits more than 42 circuits, so you can only choose between 20-42 breakers for a 100-amp panel. Breakers or circuit breakers act as a switch for cutting off power from the main electrical supply.

What size wire do I need to feed a 125 amp sub panel?

SERVICE ENTRANCE CONDUCTORS SIZE AND RATING
Service or Feeder Rating Copper Conductors Aluminum or Copper-Clad Aluminum
100 Amps #4 AWG #2 AWG
125 Amps #2 AWG #1/0 AWG
150 Amps #1 AWG #2/0 AWG

Does a sub panel need a main breaker?

The subpanel may be equipped with a main breaker to allow for power interruption without having to go back to the main panel, but it is not required to have a main shutoff circuit breaker, since the feeder breaker back in the main panel serves this function.

What size wire do I need to run a 100-amp subpanel?

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#4
The cable must have a wire gauge sufficient to the amperage of the subpanel—a 100-amp subpanel requires #4 copper wires or, more commonly, #2 aluminum wires, for example.

What size breaker do I need for a 100-amp subpanel?

20/24 panels can hold 16 full-sized and 4 twin breakers (24 circuits in total). The number of breakers can max out to 30-42, too, depending on the design of your 100-amp pane. However, NEC prohibits more than 42 circuits, so you can only choose between 20-42 breakers for a 100-amp panel.

Will #2 copper wire fit in a 100 amp breaker?

When it comes to the lines connecting master and secondary panels, where the line will carry as much as a full 100 amps, use a 2-gauge non-metallic sheathed electrical cable. The cable must contain one or two hot wires depending on your needs, one neutral wire, and one ground wire. Each wire should be 2-gauge in size.

What size breaker do I need for a 100-amp sub panel?

Typically, you need to connect a 100-amp sub-panel to the main panel via a correctly-sized breaker of 100 amps. You can still use a 100-amp sub-panel on a lower-amp breaker, but you will not be able to utilize the full 100-amp capacity of the panel. Installing a 100-amp sub-panel on a 200-amp breaker would allow the wires to overheat.

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What kind of wire do I need for a sub panel?

It also needs a neutral wire and a ground wire. The cable used for this run is known as a “three-wire cable with ground.” The two hot wires, called feeder wires, will provide all of the power to the subpanel. Accordingly, what size wire do I need for a 200 amp sub panel?

What size circuit breaker do I need for a feedfeeder subpanel?

Feeder circuits supplying subpanels are 240-volt and require a double-pole circuit breaker. Click to see full answer. Consequently, what size wire do I need for a 60 amp subpanel?

What size conduit do I need for a 150 amp sub panel?

The good news is that the conduit is 1 1/2″ which is the proper size for a max fill of 4 1/0 wires which is what is required for the 150 amp sub panel. You’re obviously assuming copper wire, as opposed to aluminum. How do you size a sub panel? Subpanel Circuit Breaker Sizing