It sounds to me like the exhaust timer is just a switch. The 20 amp rating that the timer is given is the maximum amount of current that it can handle and still be within its safety specifications. It will work very well on a 15 amp circuit.
There isn't a formula, but the general rule is that you allow for 1 amp per outlet and you load the circuit to 80% of maximum. For a 15 Amp circuit you can have a maximum of 12 outlets.
If you are talking about splicing a 40 amp cook top into an existing 3C #10 30 amp circuit then the answer is no. An appliance with that load ampacity needs to have its own dedicated circuit. This would consist of 3C #8 wire cable fed from a two pole 40 amp breaker located in the distribution panel.
For a 10 amp, 250 volt circuit, you should install a circuit breaker rated for at least 10 amps and 250 volts. A common option would be a single-pole, 10 amp circuit breaker designed for 240-250 volt applications. Be sure to check the specifications and compatibility with your specific electrical panel.
Remove the 30 amp double pole breaker and install at least one single pole 15 amp breaker. It is best if the other slot is not left open so if you have another single pole breaker of any size install it in the 2nd spot so it isn't open when you replace the cover on the panel. For your 15 amp circuit you need #14 gauge copper wire or larger with a hot, neutral, and ground. Your 30 amp circuit was probably wired with #10 gauge conductors. These will probably work on your 15 amp circuit but it may be difficult to connect #10 conductors to devices.
Yes, if properly wired a 20 amp circuit is a great circuit for an 18 amp appliance. Properly wired means you've used 12 gauge wire or larger and the circuit is protected by a 20 amp breaker or fuse and all connections are secure.
No, it is not safe to install a 20 amp receptacle on a 15 amp circuit. The receptacle should match the circuit's amp rating to prevent overloading and potential fire hazards.
No, it is not safe to install a 20 amp outlet on a 15 amp circuit as it can overload the circuit and create a fire hazard. It is important to match the outlet amperage with the circuit amperage for safety reasons.
No, it is not safe to install a 15 amp outlet on a 20 amp circuit. The outlet should match the circuit's amperage to prevent overheating and potential fire hazards.
No, it is not recommended to install a 15 amp outlet on a 20 amp circuit as it may pose a safety hazard and could potentially overload the circuit. It is best to match the outlet amperage with the circuit amperage for proper functionality and safety.
There isn't a formula, but the general rule is that you allow for 1 amp per outlet and you load the circuit to 80% of maximum. For a 15 Amp circuit you can have a maximum of 12 outlets.
On a 20 amp circuit, it is safe to install up to 13 outlets that are rated for 15 amps each.
Install the fuse that is required for the circuit.
Up to 12 on a 20 amp circuit. Up to 9 on a 15 amp circuit. But use common sense. If the circuit will be heavily loaded, as in a home office, then do not install that many.
Not unless you change the wiring for that circuit. The breaker protects the wiring and if you install a 40 amp breaker on a 15 amp wire circuit you will have a fire in your home.
A #14 copper wire rated at 15 amps is the minimum size wire for a 15 amp receptacle.
At 120 volts a 15 amp circuit wired with #14 wire used for a dedicated light circuit do not install any more than 1400 total watts in lighting. If used for an dedicated outlet circuit do not install more than 8 outlets.
If you are talking about splicing a 40 amp cook top into an existing 3C #10 30 amp circuit then the answer is no. An appliance with that load ampacity needs to have its own dedicated circuit. This would consist of 3C #8 wire cable fed from a two pole 40 amp breaker located in the distribution panel.