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Can i put 20a 240v outlet on 30a breaker with 10/2 wire

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It will work and be protected. Most all a/c window units are wired that way and inline water heaters.

Posted on Dec 23, 2016

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We want to buy a Neff bu-in double oven which needs a 20 amp supply (hard-wired).Our old existing oven is running on a 30 amp supply apparently. Will we have problems when the new Neff is fitted?


The breaker could be changed from 30a to 20a. A 30amp breaker will run the unit but you will have less/no protection since the oven will pull 10 extra amps before it trips which could totally fry your oven depending on the failure.
Re-check the wording to see if it says 'minimum' 20amp breaker or if it indicates 20amp breaker only. If it's minimum 20amp I'd run it.
If it says 20amp only, I'd change the breaker. The existing wiring and outlet will be OK, if the plug-in is the same.
Get an electrician to change the breaker. You should really know what you are doing before you try it yourself.

Sep 16, 2017 | Neff Ovens

1 Answer

Can I put a 20a 240v outlet on a 30a breaker with 10/2 wire


Check with your local town ship to make sure you meet their standards on construction and ordinances.

Dec 23, 2016 | Electrical Supplies

2 Answers

The wire in my house for an elec. garage heater is 14 gauge wire with a 15 amp breaker. I assume i need at least 10 gauge wire with 20 amp .The heater is 20.9 amps and 3000-5000 watts, with 17500 BTUs


Curt, a 20 amp breaker will blow if you pull 10.9 amps from it. I suggest having a licensed electrician do your wiring. Likely, you need a permit anyway.

Oct 22, 2015 | Water Heaters

2 Answers

Breaker trips; reset breaker at panel and water heater "on" light comes on. Breaker tripped again in 5 min; reset breaker again and water heater light comes on. Cycle continues to repeat. Bad...


It is possible that the breaker is bad. It is also possible that your water heater is overloading the breaker. It is probably easier to try a new breaker to start with. Unless you are familiar with changing the breaker, call an electrician. Your life is a very valuable asset to you!

Feb 18, 2011 | Water Heaters

1 Answer

Is it a bad circuit breaker?


First is it really a 30A single pole GFCI breaker that is tripping? This is not the type of breaker you'd find on duplex receptacles. If so, unplug all devices on this circuit and try to reset. If this works plug each item in one at a time to see which causes the tripping. Duplex receptacles should be fed only with a 20A breaker and 12Ga copper wire, or with a 15A breaker and 14ga copper wire. An electriacl panel should never be "hard to get to" NEC code rquires panels to be accessble, and requires 30" min widh clearance, and 3'in front of as well as access.

Apr 17, 2010 | Gb Electrical 1 30 Amp Ground Fault...

1 Answer

Have a dedicater 220v 20a circut break to a clothes dryer. The only work done but the electrician was a new main grounding wire and removed conduit and wiring in the basement. Now the breaker opens after 1...


Typically, a standard electric dryer is 30A 240V unless it is natural gas. If the wire is #10awg then you can put a 30A circuit breaker on it. If the wire is #12awg then you DO NOT want to put a larger circuit breaker on it or it over heat the wiring in the wall. If it was a short in the wiring the circuit breaker would trip immediately even with out the dryer plugged in. If it was a grounding problem the circuit breaker would not trip at all, it would just electrify the dryer chasis. It sounds like it is an over current problem, drawing more than 20 amps through the circuit breaker, or like the dryer has an internal problem that is causing the circuit breaker to trip.

Nov 21, 2009 | Gb Electrical 100 Amp GE Load Center

1 Answer

I need a diagram of the underhood fuse block for my 2002 ford explorer. I don't have an owners manual.


Fuse/Relay Location*Fuse Amp Rating* Description
1 60A** PJB 2 30A** BSM 3 20A** Not used (Spare)
4 30A** Rear defrost 5 40A** ABS (pump)
6 60A** Delayed accessory circuit breaker
7 20A** Power point #2 8 — Not used 9 20A** Power point #1
10 30A** ABS module (valves) 11 40A** PTEC
12 50A** Ignition relay/Starter relay
13 40A** Trailer tow battery, Trailer tow turn signals
14 10A* Foglamps 15 15A* Memory (KAPWR)
16 15A* Headlamp switch 17 20A* 4x4 (v-batt 2)
18 20A* 4x4 (v-batt 1) 19 20A** High beam relay
20 30A** Electric brake 21 30A** Front wiper motor
22 20A** Autolamp; Low beam 23 30A** Ignition switch
24 20A* Rear Fog Lamps 25 – Not used
26 15A* Fuel pump 27 20A* Trailer tow lamps
28 20A* Horn relay 29 60A** PJB 30 20A** Rear wiper motor
31 — Not used 32 — Not used 33 30A** Auxiliary blower motor 34 30A** Power seats, Adjustable pedals
35 20A** Rear power point 36 40A** Blower motor
37 15A* A/C clutch relay/Transmission
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Nov 15, 2009 | 2002 Ford Explorer

1 Answer

Installing load panel & inlet box


The bigger lugs will tighten just fine. Go that route and it will be easy to upgrade! If it seems way large when you put the wire in, strip the wire back and double it over. The # 6 may be a bit big for the 30 amp lugs. 30 amp circuit is usually # 10.

Sep 08, 2009 | Reliance Controls 50-Amp Power Inlet Box...

2 Answers

I have 2-240V (4.2V) basebaord heaters, Need Wiring Diagram


you get 120V from any phase (black OR red) to neutral
you get 240V from phase to phase (between black and red) and in this scenario you don't need the white wire.
So for you, connect the black to 1 pole of the breaker and the red to the other pole, connect the green wire to the ground strip and you are done.
A white wire is NEVER connected to a circuit breaker anyway, it is a grounded wire, it would be like connecting a green wire to a black wire, bad idea.
the National electrical code specifies red and black wire color for 240VAC circuits.
As Ask Hank mentionned, nothing wrong with 10/3 wire.

Mar 22, 2009 | Fahrenheat Electric Hydronic Baseboard...

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