I have the Van's HID landing lights on my RV-10 (one on the leading edge of each wing). They are wired to a single 10amp circuit breaker. Occasionally, when they have been on for several minutes (for a long taxi), the breaker will trip. After a couple minutes it will reset without issue. Most of the time this doesn't happen at all (I can leave the lights on for an hour with out a problem).

I am assuming that the lights are drawing enough current to cause that breaker to heat up and trip.

I asked an experienced builder if it made sense to up the breaker to 15amps. He said that might help but I needed to know the wire guage and length to properly determine the safe breaker size.

Can someone help me with this? What size wire should these lights use? How do I do the calculation?

thanks.