#Changing a 15 amp breaker to a 20 amp install
#Changing a 15 amp breaker to a 20 amp full
#Changing a 15 amp breaker to a 20 amp software
#Changing a 15 amp breaker to a 20 amp code

You don’t reduce its capacity because you add a few 15A breakers. Your main panel breaker is probably 100 to 200 Amps.

You can safely, and legally** use a wire nut in a receptacle box to connect a 14ga pigtail to a 12ga wire, as long as the device you connect to the 14ga wire will never draw more than 15Amps. If you have a 20A circuit and you plug in a 100W lamp, you don’t need to change the breaker.

#Changing a 15 amp breaker to a 20 amp code

I was an electrician in a former century and dealt with the code and inspectors more than I liked. The breaker must be downgraded to prevent a fire risk and to comply with electrical code. There was no mention of using it with a particular appliance. This is 100% a no, there is no question to that. Shelly 2.5 on 20Amp circuit at a particular power outlet. There is no mixing up numbers, or any of that, The OP was very clear. The original post was - Shelly 2.5 on a 20Amp circuit. I know 2 years later this would be long solved, but the banter back and forth ignored the OP. If you are installing the Shelly on a single appliance, then go by the appliance rating, and that would be no different to using a lower rated extension cable on the socket. Anyone remember the SonOff relays that have burnt up, even slightly under their max load?

Not to mention that this would be against electrical code, and invalidate insurance.

#Changing a 15 amp breaker to a 20 amp software

You cannot rely on the software of the Shelly doing a graceful shutdown, as it may keep it going and burn up the relay. If a Shelly Device rated at 10Amps is installed in the Consumer Box/Breaker Box, Fuse Box whatever you want to call it or a wall outlet that can have anything plugged into it and it has a 16A or 20A breaker on that circuit, that is a fire risk. DEFINITELY CONSULT AN EXPERT before replacing fuses with a larger size! Ken Stewart, Easley Electric Inc.2 years later, I was looking at this and I can see nothing but conflicting arguments going back and forth. In other words, it can be even more dangerous to upsize fuses because of age and wear. If you have them, chances are that your wiring is older, with insulation that is not as heat resistant, and you have more likelihood of deteriorated wire terminations, etc. In the case of a fuse that keeps blowing, it’s even more important NOT to just replace with a larger one! But it pays to ask an expert on this first. This is something allowed by the National Electrical Code and most inspection authorities. Sometimes, it may be OK to increase the size of a breaker to allow for motor load startups (e.g., air conditioners).

It may even be necessary to add dedicated circuits for large loads, such as space heaters of 1500 watts or more, which could otherwise load a single circuit down.

#Changing a 15 amp breaker to a 20 amp install

If it’s overload, it is best to install adequate number and size circuits to handle the increased loads. If it’s faulty equipment, that should be eliminated. If the cause is a short circuit, that needs to be repaired. It’s better to eliminate the problem than to override the protection.Thus, going from a 20-amp breaker to a 30- accomplishes nothing. A short circuit condition is usually in the range of THOUSANDS of amps.

#Changing a 15 amp breaker to a 20 amp full

It’s like running a car engine at full speed for a long period-it will cause the components to get too hot, and it could result in fire. If the breaker is tripping because it’s overloaded (say, drawing 25 amps on a 20-amp breaker), increasing the size may cause the wire or the receptacle to overheat. When the breaker is tripping, it is almost never a good idea to replace it with a larger one. When installed correctly and properly sized, breakers are designed to protect wiring and devices from overheating and potentially causing a fire. Breakers are protective devices, similar to governors on vehicles to control speed, or door stops to keep the door from damaging something.