11/27/2023 0 Comments Double 40 amp breakerOn the subpanel, your best bet is to Think BIG. You will need to buy an accessory ground bar. Neutral must be separate from ground in the subpanel. The advantage to 60A is that breaker is cheap. You can use a 60A to 90A breaker with it. As such, the best value for wiring is actually #2 aluminum, such as 2-2-2-4 SER. You will only be in trouble soon after, when you run out of spaces again!Ĭable prices are weird, because aluminum wire is considered bad at small sizes but good at large szies. Planning for the smallest possible is a bad mistake. So plan to allow for more load than you need right now. That being said, upsizing will allow flexibility and future expansion.Īlso keep in mind that if the subpanel includes any ordinary receptacle circuits (with 15A or 20A 120V receptacles), while you may think "3A for xyz tool", the next user may plug in a 12A space heater. Most of the time things are not perfectly balanced, but it is reasonable to use a 40A double-breaker to feed a subpanel with those sorts of loads. If it is in a different building then you probably need two ground rods, and a shutoff/disconnect as well.Ĥ0A (39.22 rounded up) of 120V loads is really only 20A of 240V load if perfectly balanced. You do not need a ground rod at the subpanel if it is in the same building. But you need to make sure ground and neutral are kept separate in the subpanel, even if they are mixed together in the actual main panel. If so, that main breaker can be any size equal to or larger than the feed breaker in the actual main panel. However, it can have one, and sometimes a "main panel" that includes a main breaker makes sense. Get at least a 12 space panel (larger is fine) so that you have room future expansion.Ī subpanel in the same building does not, as I understand it, need a shutoff or main breaker. If you need "5 poles" in the subpanel, presumably that means 5 single breakers for 120V loads. For example, 2 AWG aluminum will get you 90A, enough for a huge subpanel, and cost (typically) close to the price of 8 AWG or even 10 AWG copper. However, you can also normally use aluminum wire instead of copper wire when connecting panels, and that can save a lot of money even though you need to use larger wire. The breaker in the main panel connected to the feed wires to the subpanel has to match the wire or be a lower value (with certain exceptions). However, if you are using individual conductors in conduit (instead of cables) and 75 C terminations (which, as I understand it, is generally the case for most standard circuit breakers and panels) then you get more - 8 AWG 50A, 6 AWG 65A. Generally speaking, 10 AWG will get you 30A, 8 AWG 40A, 6 AWG 55A. Nameplate values matter, but with plug-in receptacles anything is possible and you should plan for that (within reason).Subpanel can provide any amount up to the feed breaker, though it can have (for convenience if bundled) a larger main breaker.Nothing other than #1 electrical square screwdriver is needed for the installation and the bus clamps are pre-treated with a dab of dielectric grease for better contact and to prevent oxidation of the clamp surfaces.There are a few different issues here, but basically: It comes in a clam-type packaging, well insulated and totally safe for online ordering. Those breakers are must have according to code in almost all states and offer excellent quality and protection. In terms of pricing, it is a little expensive, but then you can't really put a price on a life that can be endangered. It is not 2x single pole, it is balancing load interrupter which adds a layer of protection on double pole circuits that you can only have with the double pole breaker such as this one.Īt 2x25A this won't be the one for HVAC applications, but perfect for hot tub, or a dryer. The GFCI protection is lightning fast at 10,000 AIR/A nom I, which I measured at 0.05 seconds. Format is TIPO HOM so it fits on any GE/Siemens panel. It can be used on 3-wire 120/240V, two wire 240V or multi-wire circuits. This is multifunctional double pole GFCI breaker.
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