40 amp dryer circuit

[Greg1707]

In older houses I often see the dryer set up with a 40 amp circuit. Any reason for this?

 

[Dennis Alwon]

Other than the fact that they ay have used an old range circuit I have no idea why it would be on a 40 amp circuit. 30 amp is what is required.

 

[mbrooke]

Perhaps a mistaken case of the 125% rule? I've seen 70s homes with 60amp range circuits- no idea why.

 

[Coppersmith]

I've also seen 60 amps range circuits and other circuits that are incorrectly protected. If I'm doing a panel change, I automatically correct these situations. Otherwise, I strongly suggest to the HO that they change them to avoid a fire. Just the other day I came across a 20 amp water heater (with #12 wires) on a 30 amp breaker.

 

[hbiss]

Back in the day large 36" electric ranges with two ovens were popular. My parents had one and the 50A circuit and receptacle is still there. I've since converted to gas.

-Hal

 

[mbrooke]

Actually, in the 50s, there was a dryer that took a 50amp circuit. The concept did not last long, but I think it was to mimic a gas dryer in speed. Someone older may remember it.

 

[mbrooke]

Just the other day I came across a 20 amp water heater (with #12 wires) on a 30 amp breaker.

Not to code, but if you ask me thats a none issue. Common practice in Canada.

 

[Coppersmith]

Not to code, but if you ask me thats a none issue. Common practice in Canada.

:? I don't see how you can say protecting a 20 amp circuit with a 30 amp breaker is a non-issue. Don't we discuss putting the proper sized breaker on circuits all the time.

 

[mbrooke]

:? I don't see how you can say protecting a 20 amp circuit with a 30 amp breaker is a non-issue. Don't we discuss putting the proper sized breaker on circuits all the time.

The heater isn't a receptacle- more load can not be added to the circuit.