25 amp breakers

[acrwc10]

No it didn't they had to replace the unit.

And I'll bet the A/C guy still has a problem, it's called ignorance. :grin: If you can't tell by my tone, I don't think those guy's are the sharpest pencil in the box. I had one take off the covers, pull out handles, and dead fronts, on 3 disconnects to do his part of the install. When he was done he left all the parts laying in a pile in the corner of the yard, and he was on his merry way. The best part is the power to the house isn't even connected by the POCO yet, no need to pull out the disconnects.

 

[brother]

here we are required to run conductors the size of #10 copper minimum where the rated water heater is in excess of 3500 watts. So a 4500/240 watt water heater here would have a #10 copper even though its only pulling 18.75 amps.

I am referring to Chris K. statement on a 4500 watt element. I thought Chris was saying that you had to use a 25 amp. breaker based on 4500/240 multiplied by 1.25. He got 23 or so amps. Statement 3 says you can use 150% of the rated current for OCP and then use the next higher OCP if you fall in between standard size breakers.

I am not saying that you can't use a 25 amp breaker just that a 30 amp breaker would also be code compliant on a 4500 watt element

Dennis, im curious on this article 422.11(E), if a person was to use #12 copper on this water heater , would they still be able to get away with using the 30 amp breaker?? Would not the other articles that forbid #12 copper from being a breaker over 20 amps come into play??

 

[Dennis Alwon]

Dennis, im curious on this article 422.11(E), if a person was to use #12 copper on this water heater , would they still be able to get away with using the 30 amp breaker?? Would not the other articles that forbid #12 copper from being a breaker over 20 amps come into play??

I assume you are talking about a 3500 watt heater @ 120 volts. In this case if you use a #12 wire I think you would need to protect it at 20 amps not 30. Art. 240.4