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Can an appliance rated for 15A be operated safely on a 20A circuit?

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Yes, as long as the circuit is not overloaded. Some kitchen appliances require a dedicated circuit depending on your local code. In my area the following require a dedicated circuit. Dish washer, refrigerator, microwave, garbage disposal, stove, and 2 separate dedicated circuits for all the rest of the kitchen receptacles. Check you local code.  
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If the hot water heater and dryer are both run off of split 15A breakers is it safe to upgrade to 20A breakers?

You live in a mobile home, or older house? I live in a doublewide, and my dryer breakers are 30amp, and the water heater breakers are 20, both 220V lines, shared. The only sa

Can you use 15A plug receptacles on a 20A circuit?

No. You need 20 amp receptacles. ( if a single receptacle on an individual brach circuit NEC 210.21 (B)(1) )       Yes you can use a 15 amp receptacles on a 20 amp br

Can you use 15A outlets on a 20A circuit with 12-2 wire and a 20A breaker and how many outlets would this allow?

I'm going to assume you are referring to residential construction because rules for commercial and industrial settings can be different. Also rules differ by geography (i.e. C

Can you use a light timer that is rated at 15A and 115V with a circuit that is rated at 20A and 120V?

  Yes you can. Please be aware you have the situation of pulling more amps, in this case 5 amps, over the timmer before the fuse blows. which may damage the timer To avopi

Can you upgrade from a 15A to a 20A fuse?

Answer for USA, Canada and countries running a 60 Hz power supply service.   Fuses are sized to protect conductors       (LIFE SAFETY WARNING! [disclaime

A small appliance circuit will be protected by a circuit breaker rated at?

A small appliance circuit will be protected by a circuit breaker rated at 15 amps if the circuit wires are #14. If the circuit wires are #12 then a 20 amp circuit breaker coul

Is it advisable to use a 30A fuse in a circuit that is rated to carry only 20A?

The purpose of a fuse or breaker is to prevent electrical fires. Using a 30 in place of a 20 is not advisable even if it does not immediately cause a short. Taking a chance wi

Can you replace a 20A GFCI with a 15A?

Yes, you can go down in current protection, but not up. With 15 Amps you just won't have as much capacity to power connected devices. If that isn't a problem you can make the

Can you use 15A outlets on a 20A circuit with 12 2 wire and a 20A breaker and how many outlets would this allow?

It depends on if you have a single outlet (receptacle) on a branch or multiple receptacles on a branch. One receptacle on a 20A branch: The receptacle must be rated 20A Tw