How to know if my heat pump wire is the right size?
Electricians can flag heat pump wiring as undersized and flickering lights can hint at electrical issues, leaving homeowners unsure how to verify the wire size themselves. This makes it difficult to know if an existing wire is correct when handling repairs or dealing with safety inspections.
Core Friction Pattern
Analysis of 5 peer accounts across online developer and community forums reveals that “How to know if my heat pump wire is the right size?” repeatedly surfaces due to edge-case mismatches between standard defaults and real-world environments. Standard troubleshooting frequently falls short, compelling practitioners to develop custom workarounds.
+7 alternative community-tested workarounds cataloged below.
What the numbers show
Counted from the threads quoted below. How we count
- People have been saying this in most months since September 2026.
- This comes up 104.1× more often in r/askanelectrician than across the site as a whole.
What people tried
Every workaround mentioned in the threads below. We haven’t tested any of them — and nobody here is claiming they worked.
Found another way around this?
Share your steps and trade-offs so fellow engineers don't have to reinvent the wheel. No account required.
How to know if my heat pump wire is the right size?
- 1resetting the breaker panel when units tripDid this help you?
- 2Treating the existing connector size as good enoughDid this help you?
- 3Using a spade connectorDid this help you?
- 4Asking on electrical forums to identify the gauge visuallyDid this help you?
- 5Guessing the size based on the original janky wiringDid this help you?
- 6searching online for supportDid this help you?
- 7calling specialty stores for adviceDid this help you?
- 8asking peers on trade forumsDid this help you?
In their words
Unedited, grouped by where they were said, most upvoted first within each place, each linked to the thread it came from.
“In the master bath, I found that there are 12awg wires mixed with 14awg wires.”source ↗
“is mixing wire sizes like this okay?”source ↗
“do the 14awg need to be rewired with 12awg due to the circuit size?”source ↗
“She said people were saying online that voltage drop is a concern at 100 ft. I cannot find anything online or by calling the RV store to support that.”source ↗
“I recently had an electrical safety inspection and the electrician said the wiring that serves the heat pump is undersized.”source ↗
“I have noticed the lights flickering on occasion, though.”source ↗
“Can anyone identify or guess the size/gauge of those red cables running off the terminals on the left-hand side?”source ↗
“Also, if you have recommendations on the ideal wire gauge to build a fresh, reliable set of jumpers for these 12V 24Ah batteries running a 60V setup, I’d really appreciate the input.”source ↗
“As stated before A lot of the jumpers and wire ends are looking crispy, so I’m planning to replace all the cables while I swap the pack.”source ↗
“I know about voltage drop but it's very rarely ever needed to consider in the city in residential, and I have only ever installed a couple of 120 volt 30 amp circuits, especially not for an RV 100 ft from the panel.”source ↗
“Broke the wire on the A terminal. Got a new connected but how do I make sure the old wire is the right size?”source ↗