Timeline for Is my heat pump supplemental heating served by an oversized breaker?
Current License: CC BY-SA 4.0
10 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Jan 13 at 17:12 | history | edited | tau | CC BY-SA 4.0 |
edited title
|
| Jan 13 at 4:11 | comment | added | ThreePhaseEel | Can you post a photo of the indoor unit's wiring diagram mean please? | |
| Jan 12 at 21:55 | history | edited | tau | CC BY-SA 4.0 |
added 55 characters in body
|
| Jan 12 at 20:41 | comment | added | NoSparksPlease | It probably changes nothing since wire insulation is rated likely rated for 75°C, but wire size is 125% of minimum circuit ampacity, so 104.25A. #1 AL is only rated for 100A, so really 1/0 is the minimum size. If you have 90A fuses or breaker at the maintenance disconnect then 125A in panel is OK since 1/0 is rated for 120A, 120A is not a standard breaker size, so you can upsize to 125A breaker. If your maintenance disconnect is unfused or larger than 90A then you will need to change the panel breaker to 90A. So the question is what type of wire is feeding this? | |
| Jan 12 at 20:31 | answer | added | MadMonty | timeline score: 1 | |
| Jan 12 at 18:46 | comment | added | KMJ | You said 230V, if that's correct this label is pretty clear. | |
| Jan 12 at 18:34 | comment | added | crip659 | The breaker would be okay if you have 90 amp fuse/breaker protection at the heat pump disconnect. | |
| Jan 12 at 18:05 | comment | added | crip659 | Wire size can usually be larger than needed. Do seem to have a problem with the breaker size. Manufacturers instructions/label have to be obey, so the 125 amp breaker is against code/should not pass inspection. | |
| Jan 12 at 17:45 | history | edited | isherwood | CC BY-SA 4.0 |
deleted 2 characters in body
|
| Jan 12 at 17:42 | history | asked | tau | CC BY-SA 4.0 |