What gauge wire for a 20A fuse?

AlanS · Post by **AlanS** » 26 Dec 2024, 16:24

I have to rewire the wires going to/ from the fuse box re: my radio. It's the 20A fuse that is accessible when you open the driver's door. It's a complicated issue, but I need to add an in-line 20A fuse. Do I need to consider the gauge wire I use to add a 20A fuse? I ordered a fuse holder with attached wire and it was 12g...very thick, not very pliable to route around things. What gauge wire would be appropriate for use with a 20A fuse? Don't ask about the 'issue'...This will correct it.

Post by **br0dy519** » 26 Dec 2024, 19:04

Electrical code here states 12 gauge for a 20 amp breaker, not sure how that translates to 12V dc in automotive land. Stranded wire would make bends easier. I would think if you're adding a fuse in-line, just splice it in somewhere convenient on the existing wire.

Post by **abscate** » 27 Dec 2024, 04:39

14 AWG or 12awg depending on the wire run.

Here is the chart , note two things

Length is total length, or 2x the piece of wire you cut to run to the load.

10% non critical circuit are resistive loads and lamps

Electronic stuff needs the 3% critical rating

Reference Blue Sea Inc wiring load chart

Post by **volvolugnut** » 27 Dec 2024, 09:15

It is best to always use stranded wire for all automotive applications. Solid wire will work harden with vibrations and may break. I have purchased automotive blade type fuse holders with stranded wire ends. Some even have water seal caps over the fuse.
volvolugnut

Post by **abscate** » 27 Dec 2024, 16:06

Lug is 100% on point , thanks for catching that. One of the few times it is good to be stranded